Mojotone Blackface Princeton Reverb STYLE 1 X 10 COMBO... User manual

1WWW.MOJOTONE.COM
The Blackface Princeton Reverb® has been a staple in guitar tone since its
inception in 1964. Similar to the idea
behind the Vibro Champ, the Princeton
Reverb was essentially all the good parts
of its predecessor, the Tweed Princeton, but
with a long-spring reverb and tube-driven
tremolo circuit added. These amps were
ideal not only for use in the studio, but for
traveling and gigging with as well. Over
the years the Princeton Reverb has worked
its way into the gear repertoire of many
renowned guitarists such as Larry Carlton,
Glen Campbell, and Tommy Tedesco.
THE MOJOTONE
BLACKFACE
PRINCETON REVERB
STYLE1X10 COMBO AMP

Copyright © 2019 Mojotone, LLC
All content included in this book including text, graphics and images is the property of Mojotone, LLC and protected by U.S. and international copyright laws. The collection, arrangement and assembly of all content in this book
is the exclusive property of Mojotone, LLC and protected by U.S. and international copyright laws. You may not copy, reproduce, distribute, publish, display, perform, modify, create derivative works, transmit, or in any other way
exploit any part of copyrighted material without permission from Mojotone, LLC.
Disclaimer: Mojotone, LLC makes no representations or warranties of any kind as to the information, content, procedures, materials or operation of this book. To the full extent permissible by applicable law, Mojotone, LLC
disclaims all warranties, expressed or implied, including but not limited to, implied warranties of merchantability or tness for any particular purpose. Mojotone, LLC will not be liable for damages of any kind arising from the use
of this book, including but not limited to direct, indirect, incidental punitive and consequential damages.
CONTENTS
INTRODUCTION pg. 3
SECTION 1: SAFETY pg. 3
SECTION 2: INVENTORY pg. 4
SECTION 3: TOOLS pg. 5
SECTION 4: COMPONENT IDENTITY & ORIENTATION pg. 6
SECTION 5: HOW TO READ COMPONENTS pg. 6
SECTION 6: SOLDERING BASICS pg. 7
SECTION 7: CHASSIS ASSEMBLY pg. 8
SECTION 8: TRANSFORMER WIRING pg. 10
SECTION 9: CIRCUIT BOARD ASSEMBLY & INSTALLATION pg. 12
SECTION 10: WIRING THE SOCKETS, JACKS & POTS pg. 14
SECTION 11: Speaker Wiring & Installation pg. 18
SECTION 12: Reverb Cable Wiring pg. 19
SECTION 13: INITIAL CHASSIS TESTING pg. 19
SECTION 14: Chassis & Reverb Installation pg. 20
SECTION 15: SOUND TEST pg. 21
SECTION 16: TROUBLESHOOTING pg. 21
MORE FROM MOJOTONE pg. 22

3WWW.MOJOTONE.COM
Introduction
This amplier kit wiring and assembly are based on the same construction methods
that the original designers used 50+ years
ago. This vintage method of assembly is a
“hands-on” experience. When putting them
together and you should take your time when
assembling the kit. It’s always exciting as
you get closer to nishing the build, but this
is where errors will normally occur. It can
become overwhelming when looking at the
whole picture of building the kit, therefore
try looking at the amp in small sections.
Ex: The input jacks, preamp section on the
board, power supply section on the board,
wiring the potentiometers, wiring the preamp
tube sockets, wiring the power tube sockets,
transformer wiring and so on.
Remember to take your time and enjoy the
build. If you get stuck on something, step
away from the build for a few hours or a day,
then come back to it.
SECTION 1:
SAFETY
SAFETY FIRST! Electronics can be dangerous
and must be treated with respect. Any circuit
that works with 120VAC power from an
electrical outlet is especially dangerous and
could potentially kill you. Here are some
guidelines to keep you safe as you work.
{Never work on a circuit while power
is applied.
{Do not connect power to a circuit until
the circuit is nished and you have carefully
checked your work (twice).
{If you smell anything burning,
immediately disconnect the power and
examine your circuit to find out what
went wrong.
{Keep your work area dry and organized.
{Be careful around large capacitors.
They can continue to hold voltage long after
they are disconnected from power. Discharge
electrolytic capacitors if power has been applied
to the unit.
{Be especially careful when you solder. A
hot soldering iron can easily burn you.
{Always work in a well-ventilated space.
{Have safety equipment such as a
fire extinguisher, a first-aid kit and a
phone nearby.
{Be Patient! Rushing through any type of
technical work just leads to frustration and
compounds issues that can easily be avoided.

BUILD. MODIFY. REPAIR.4
(1) Mojo 772 output transformer
(1) Mojo 776 reverb driver
(4) 9-pin tube sockets
& tube shields
(1) 10' install power cord
w/ hardware
(4) RCA jacks w/ hardware
(3) rubber grommets (4) ground tabs
(1) Mojo 760 Power Transformer
w/ hardware
(3) octal tube sockets
& tension clamps
(1) right angle 1/4" plug
(1) ground switch w/ hardware
(1) power switch w/ hardware
(1)VIB/REV 2 button footswitch
vacuum tubes
(1) indicator light assembly
w/ hardware
(3) J12A 1/4" shorting jack
w/ hardware
(1) J11 1/4" mono jack
w/ hardware
(1) Mojotone 2 spring reverb tank
& reverb tank bag
(1) eyelet boards & backer boards
potentiometers w/ hardware
(2) 250KA, (1) 250KL,
(1) 1MA, (1) 3MRA, (1) 100KL
(6) witch hat knobs
(1) fuse holder, (1) slow blow 1 amp
fuse w/ hardware
(1) Jensen C10Q 10" 35watt 8Ω speaker
10
9
8
7
6
5
4
3
2
1
12AX7 12AT7
6V6
GZ34S
10
9
8
7
6
5
4
3
2
1
12AX7 12AT7
6V6GZ34S
(1) galvanneal steel chassis
(1) Blackface Princeton Reverb style
faceplate & backplate
10
9
8
7
6
5
4
3
2
1
12AX7 12AT7
6V6
GZ34S
10
9
8
7
6
5
4
3
2
1
12AX7 12AT7
6V6
GZ34S
SECTION 2:
INVENTORY *optional based on order
(1) solid pine combo or head cabinet*
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12AX7 12AT7
6V6GZ34S
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12AX7 12AT7
6V6GZ34S
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12AX7 12AT7
6V6GZ34S
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12AX7 12AT7
6V6GZ34S
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12AX7 12AT7
6V6GZ34S
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12AX7 12AT7
6V6GZ34S
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12AX7 12AT7
6V6GZ34S
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12AX7 12AT7
6V6GZ34S
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12AX7 12AT7
6V6GZ34S
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12AX7 12AT7
6V6GZ34S
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5
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12AX7 12AT7
6V6GZ34S
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6
5
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12AX7 12AT7
6V6GZ34S
10
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5
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12AX7 12AT7
6V6GZ34S
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12AX7 12AT7
6V6
GZ34S
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12AX7 12AT7
6V6GZ34S
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12AX7 12AT7
6V6GZ34S
(1) (2)
(3) (1)

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Silver Mica
(2) 250pf @ 500v
(1) 500pf @ 500v
Ceramic Disc
(1) 10pf @ 500v
(1) 0.02 µf @ 500v
(2) 0.01 µf @ 500v
HARDWARE
(16) 4-40 1/4" screw & keps nuts
(4) 6-32 1/2'' screw & keps nuts
(9) 8-32 3/8'' screw & keps nuts
(1 set) 4 5/8" chassis straps
WIRES
cloth covered wire
22 gauge:
(2') Blue
(2') Brown
(2') Red
(6') Yellow
(3') Black
(3') White
(2') copper bus wire
RESISTORS
Carbon Composite
(1)
1/2 watt 47Ω
(2)
1/2 watt 100Ω
(1)
1/2watt 1K
(4)
1/2watt 1.5K
(2)
1/2watt 2.2K
(1)
1/2watt 2.7K
(1)
1/2watt 3.3K
(1)
1/2watt 6.8K
(1)
1/2watt 22K
(2)
1/2watt 56K
(2)
1/2watt 68K
(7)
1/2watt 100K
(4)
1/2watt 220K
(1)
1/2watt 470K
(6)
1/2watt 1M
(1)
1/2watt 3.3M
Metal Oxide
(1) 2 watt 1K
(2) 2 watt 15K
DIODE
(1) 1A diode 1N4007 @ 1000v
CAPACITORS
(6) Sprague Atom
25µf @500v
(1) Mojotone Electrolytic KingCap
100µf @100v
(1) can capacitor
w/ mounting hardware
40µf+20µf+20µf+20µf @ 500v
Orange Drop
(4) 0.1 µf @ 600v
(1) 0.047 µf @ 600v
(3) 0.022 µf @ 600v
(1) 0.0033 µf @ 600v
1
0
p
F
SECTION 3:
TOOLS
Certain tools are required to successfully build your amp. The following are recommended
to complete your project.
NEED A TOOL? Do you see something on
this list that you need? Turn to page 20
for a full list of tools, parts and kits to
add to your workbench
{1/2'' nut driver
{Set of needle nose pliers (one with teeth
and one without)
{Wire cutters
{Wire strippers
{Soldering iron and solder
{Adjustable wrench
{Philips head screw driver
{Multimeter
18 gauge:
(6') Green
(2') Black
(2') White

BUILD. MODIFY. REPAIR.6
color
Black
Brown
Red
Orange
Yellow
Green
Blue
Violet
Grey
White
Gold
Silver
TOLERANCE
± 1%
± 2%
± 0.5%
± 0.25%
± 0.10%
± 0.05%
± 5%
± 10%
BAND 1
0
1
2
3
4
5
6
7
8
9
BAND 2
0
1
2
3
4
5
6
7
8
9
MULTIPLIER
1Ω
10Ω
100Ω
1KΩ
10KΩ
100KΩ
1MΩ
10MΩ
100MΩ
1Ω
0.1Ω
0.01Ω
SECTION 4:
COMPONENT IDENTITY &
ORIENTATION
Ensure all polarized caps are in the correct
orientation when installing onto the
board. This is typically denoted by an arrow
pointing towards the negative side, or a
small indention on the positive side.
Safety first! A cap in the wrong orientation
can explode! So follow your wiring diagram
and pay close attention when orienting your
polarized caps
SECTION 5:
HOW TO
READ COMPONENTS
ReadingResistorValues
The resistors that are included in your
Mojotone kit, all use the 4-band resistor color
code for determining their values. The easiest
way to read the resistors, start by having the
gold strip facing towards the right. The rst two
colors on the left are going to be your values,
for example Yellow & Violet would be 47. The
third strip is going to be your multiplier. So for
this example, the third strip is a yellow stripe
which is 10,000. The value of the resistor is
calculated as such 47 X 10,000 which equals
470,000 ohms or 470K ohms.
ReadingOrange DropCapacitor Values
Your Mojotone kit includes 715P Series
Orange Drop capacitors. These capacitors use
a numerical value and multiplier, very similar
to resistors, for calculating their values. The
top line printed on the capacitor is going to
be the series number followed by the 3 digit
voltage rating. For example, SBE 715P600V
translates to SBE (manufacturer), 715P
(capacitor series / type), 600V (DC voltage
rating). The next line will have a 3-digit code
followed by a letter. Just like the resistors, the
rst two digits are your values in pico farads
(pf) and the third digit is the multiplier. The
letter code after the 3-digits is tolerance value
for the capacitor. For example, 104J is equal
to 10 X 10,000 or 100,000pf which converts
to 0.1uf, the ‘J’ indicates that cap is has a 5%
tolerance in value. The 4-digit code after the
value digits is going to be the date code when
the capacitor was manufactured. For example,
0936 converts to the 36th week of 2009.
ReadingSilverMicaCapacitorValues
On Silver Mica capacitors, the actual values
are printed on the capacitor. Silver Micas are
typically smaller values in pico farads. For
example, if a cap has 510 printed on it, the
value is 510pf, another would be 47 or 47pf.
POLARIZED NON-POLARIZED
common values for Orange Drop Capacitors:
102J - 0.001uf
222J - 0.0022uf
332J - 0.0033uf
472J - 0.0047uf
103J - 0.01uf
223J - 0.022uf
473J - 0.047uf
104J - 0.1uf
SBE715P600V
104J 0936
manufacturer
series / type
DC voltage rating
date code
capacitance & tolerance values
250
500
4 7 x 10,000 =
470,000 Ω
or
470K Ω

7WWW.MOJOTONE.COM
Reading Ceramic Disc Capacitor Values
Ceramic Disc capacitors will typically have
the actual value and voltage rating printed on
them.
Reading Diodes
The diode(s) included with the kit are
directional and it is very important that
they are installed correctly according to the
circuit. Pay close attention to the orientation
of the silver band that is around the outside
of the diode. Depending on the direction they
are going will determine how they conduct
or rectify the AC voltages. For example, in
the case of the Princeton Reverb, the band
on the diode is facing towards the incoming
AC voltage, meaning it is going to block the
positive cycle of the AC voltage but rectify
the negative cycle giving the negative DC
voltages needed for a xed bias amplier.
SECTION 6:
SOLDERING BASICS
Before you start slinging solder in your kit or if you have never soldered before, take
a moment to read over this section about
soldering.
When assembling your amp kit, whether
it’s putting components on the eyelet board,
wiring up the tube sockets or connecting
wires to the potentiometers, the rst thing you
want is a good solid mechanical connection.
So for example if you are connecting a wire
to a pin on a tube socket or on the back of
a potentiometer, you do NOT want to set
the wire on the pin or let it oat loosely and
throw a bunch of solder on there. Solder is
not a great conductor, specially some of the
newer lead-free solder, think of it as more of
a semi-conductive glue. So what you want
is a solid physical connection between the
components that you are connecting together.
For example, when soldering to a tube
socket, you would want to create a hook with
the wire or component lead, hook it through
the pin, then use a pair of needle nose pliers
to pinch the hook together around the pin.
Now the wire has a solid connection to the
pin, so even if solder were to fail, in theory
you have the components connected together.
After you have created the mechanical
“bond”, then you can add a little solder to
help solidify the joint.
Working with eyelet boards
When installing components onto the
eyelet boards, you want the component to
lay or sit down onto the board, feeding the
leads into the eyelets and them bending
them underneath the board. Once all the
components are installed on the board and
the connecting wires are attached as well,
then start soldering the joints. After they have
been soldered, be sure to clip the excess leads
that are underneath the boards so that they do
1
0
p
F
not short against other components.
PRO TIP: There is an exception to laying a
component down on the eyelet board and
that would be higher wattage resistors are
in the power supply OR if the amplier
is running the power tubes in a cathode
biased conguration. These components
are dropping voltages across them during
operation, which results in excess heat, and
needs to oat a little above the board to
dissipate the heat.
Soldering a connection
When soldering a connection on an eyelet,
tube socket or potentiometer, make sure that
you are heating the component lead as well as
the pin or eyelet. Then slowly ow the solder
into the connection. The solder should liquify
and spread over the connection. It should
only take about 2-3 seconds for the
connecting component leads to become hot
enough to ow solder. If it takes longer,
double check the temperature of your
soldering iron and make sure the tip of the
iron is clean. A quick way to tell if you iron is
hot enough and clean is to take a little solder
and touch it to the tip. The solder should melt
almost instantly and stay on the tip, NOT
bead up and fall off.
PRO TIP: It doesn’t take a lot of solder to make
a good connection. Again think of the solder
as semi-conductive glue that holds your
connections together.
0.0 2 µF0.0 1 µF

BUILD. MODIFY. REPAIR.8
SECTION 7:
CHASSIS ASSEMBLY
TRANSFORMERS
{Mount the power transformer using
into the chassis using (4) 8-32 keps nuts using
your adjustable wrench. The transformer will
be recessed through the rectangular cutout in
the “belly” of the chassis. You do not need to
remove the screws or nuts that are already on
the transformer.
{Install rubber grommets in holes
for output transformer and reverb driver
transformer leads.
{Mount the output transformer using
the (2) 8-32 x 1⁄4” screws and corresponding
keps nuts onto the outside of the chassis next
to the power transformer (output transformer
is not recessed). Install the transformer so
that the Red, Blue and Brown wires go
through the grommet closest to the power
transformer. The Black and Green go
through the grommet to the right of the output
transformer. The screws will go through the
inside of the chassis, and the nuts will be
installed on the outside. Use a screwdriver
and adjustable wrench to tighten.
{Mount the reverb driver transformer
using the (2) 8-32 x 1⁄4” screws and
corresponding keps nuts onto the outside of
the chassis between the two middle 9-pin
tube sockets. All four wires (Red, Blue,
Green and Brown) go through the grommet
furtherest from the power transformer. The
screws will go through the inside of the
chassis, and the nuts will be installed on the
outside. Use a screwdriver and adjustable
wrench to tighten.
Front Panel
{The faceplate will be secured by the
washers and nuts from the components being
mounted through it. Ensure the faceplate
is straight before tightening down the
components and installing the knobs.
{Mount indicator lamp using its
preassembled hardware. Un-thread the
hardware from the component and insert
it through the chassis and corresponding
faceplate cut out. Reapply hardware and
tighten with adjustable wrench and pliers.
{Mount potentiometers using their pre-
assembled hardware and 1/2” nut driver.
Make sure potentiometers are mounted with
their lugs facing up towards the open end of
the chassis.
PRO Tip: When mounting the pots, make sure
the toothed locking washer goes between
the potentiometer and the chassis. The at
washer will go on the outside of the chassis
and the nut will tighten down
rubber
grommets
mounting
holes
mounting
holes
transformer
cutout
power
transformer
output
transformer
reverb
driver
indicator light assembly
250KL3MRA100 KL250 KA250 KA1 MA
faceplate edge top view chassis edge top view

9WWW.MOJOTONE.COM
{Once you have the pots securely installed,
turn the shaft of the pot all the way count-
er-clockwise. Install the knob on each pot, mak-
ing sure the “1” of the knob is pointing to the
white indicator on the faceplate. Use a small at
head screwdriver to tighten the set screw in the
back of the knob securely on the pot shaft. If
the knob isn’t moving smoothly, loosen the set
screw, back the knob off of the pot 1/16‘‘ and
re-tighten
{Mount the J12A input jacks using their
pre-assembled hardware and an adjustable
wrench. Pay close attention to the orientation
of the jacks on the wiring diagram.
PRO Tip: Pre-install and solder any resistors
on the jacks before mounting it to the chassis
wherever possible.
Rear Panel
{The rear faceplate will be secured by
the washers and nuts from the components
being mount through it. Ensure the faceplate
is straight before tightening down the
components.
{Mount Ground and Mains switches
using their pre-assembled hardware.
{Mount the Fuse holder using its pre-
assembled hardware. Install the fuse at this
time.
{Mount the J12A and J11 jacks. J12A
in the “SPEAKER” position and J11 in the
“EXT. SPKR” position.
{Mount the (4) RCA input jacks in the
remaining holes on the back of the chassis.
SOCKETS & CAN CAPACITOR
{Mount octal tube sockets and tension
clamp using the (6) 4-40 x 3/8” screws and
keep nuts. When mounting, be sure to choose
an orientation and keep this orientation
uniform throughout all octal sockets. Install
octal sockets with solder lugs facing inside
the chassis. Be sure to mount the ground tabs
for both of the power tube sockets.
{Mount 9-pin tube sockets using (8) 4-40
x 1/4” screws and keps nuts and tighten down
with adjustable wrench and screwdriver.
{Mount can capacitor screws and keps
nuts and tighten down with adjustable
wrench and screwdriver. Be sure to mount
the ground tab.
potentiometer and knob assembly
input/output jack assembly
fuse holder assembly
octal tube sockets
octal tube socket assembly 9-pin tube socket assembly can capacitor assembly
can capacitor
9-pin tube sockets
ground switch assembly
RCA jack assembly power switch assembly

BUILD. MODIFY. REPAIR.10
SECTION 8:
TRANSFORMER WIRING
Power Transformer
{Twist all matching pairs of wires coming
out of the power transformer.
{Measure length needed for each wire,
allow yourself extra lead and cut to length.
This will eliminate excess wire and free up
space in your chassis — apply this principle
to all leads.
{Prepare the two Red wires from the
power transformer (HV secondary). Solder
one wire to pin 4 and the other to pin 6 of the
rectier tube socket, the octal socket that is
closest to the power transformer.
Note: These wires carry AC voltage, so either
wire can go to either pin 4 or 6.
{Prepare the Red and Yellow striped
wire, connect it to one of the ground tabs by
the can capacitor
{Prepare the two Yellow wires from the
power transformer (5v rectier lament) and
connect them to pins 8 and 2 (top opening of
pins) of the rectier tube socket. Solder pin 2
but don’t solder pin 8 yet.
{Prepare the 2 Green wires from the
power transformer (6.3v tube lament).
These will go to your pilot light with the (2)
100ohm resistors to ground.
{Determine which Primary AC voltage
(AC voltage coming from the wall socket)
you will need. The power transformer
included with the kit has taps for both USA
and export voltages. White - 120V (USA),
Black / Blue - 100V, Black / Yellow - 220V,
Black / Green - 230V, Black / Red - 240V.
{Measure and strip the AC Voltage wire
for your application, connect it the ring
terminal of the fuse holder.
{Measure and strip the Black wire
coming from the power transformer and
connect it to the left side terminal on the
power switch.
{For the remaining primary voltage wires,
clip the ends, apply a piece of heat shrink
to each end, then neatly secure them in
between the side of the chassis and the power
transformer.
{Double check your wiring
Blackface Style Princeton Reverb
Revision 2.0 04/02/2019
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220 K
INDICATOR LIGHT
POWER
TRANSFORMER
FUSE HOLDER
POWER
SWITCH
CAN CAPACITOR

11WWW.MOJOTONE.COM
OUTPUTTRANSFORMER
{Twist all sets of wires together. Primary
is Red, Blue and Brown. Secondary is
Black and Green.
{Connect the Brown wire from the output
transformer to pin 3 of the power socket
closest to the rectier.
{Connect the Blue wire from the output
transformer to pin 3 of the power socket
closest to the mains switch.
{The Red wire from the output transformer
will be connected to the eyelet board after the
board has been installed.
{Connect a small jumper wire from the
middle lug (shorting lug) of the J12A jack to
its ground lug.
{Connect the Black wire from the output
transformer to the ground lug of the J12A jack
{Solder the middle lug and ground lug of
the J12A jack.
{Connect the Green wire from the output
transformer to the tip lug of the speaker jack
(J12A jack) closest to the power sockets.
{Connect a small jumper wire from the
tip lug of the J12A speaker jack to the tip lug
of the J11 EXT jack.
{Double check your wiring
REVERB DRIVER
{Twist the Green and Black wires
together.
{Connect the Green wire to the center pin
of the RCA labeled “REVERB INPUT”
{Connect the Black Wire to the ground
lug of the same RCA jack.
{Connect the Blue wire to pin-6 of the
preamp tube to the right of where the blue
wire comes through.
{The Red wire will be connected to the
eyelet board after the board has been installed.
{Double check your wiring and begin
soldering all connections in this section.
Blackface Style Princeton Reverb
Revision 2.0 04/02/2019
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PREAMP TUBE
9 PIN SOCKET
12AX7
220 K
Blackface Style Princeton Reverb
Revision 2.0 04/02/2019
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PREAMP TUBE
9 PIN SOCKET
12AX7
POWER TUBE SOCKETS
SPEAKER
JACK
PREAMP
TUBE SOCKET
REVERB
INPUT
EXTERNAL
SPEAKER
JACK

BUILD. MODIFY. REPAIR.12
100K
100 uF
1n4007
22K
15 K
1 K
1M
1M
1M
1M
1M
47 Ω
56 K
56 K
1 K
220 K
220 K
220 K
25 uF
+
25 uF
+
25 uF
+
25 uF
+
25 uF
+
25 uF
+
3.3 K
100K
100K
100K
100K
100K
2.7 K
1.5K
1.5K
1.5K 1.5K
2.2 K
500 pF
0.1 µF 0.1 µF
0.01 µF0.01 µF
0.02 µF
0.0033 µF
0.1 µF
0.022 µF
0.022 µF
0.022 µF
470K
3.3 M
250 pF
0.1 µF
0.047 µF
10 pF
10 pF
SECTION 9:
CIRCUIT BOARD ASSEMBLY
& INSTALLATION
CIRCUT BOARD ASSEMBLY
{Starting at one end of the front side of
the board, identify the necessary components
for each eyelet connection and place leads
through the eyelet holes. Once inserted, bend
the leads under the bottom of the board to
hold them in place.
PRO Tip: When a capacitor and resistor are
both running between the same eyelet holes,
you can twist their leads around one another
and solder to form a solid mechanical
connection.
{Once all components are in place on the
front side of the board, ip the board over and
start applying traces or jumper wires to the
backside of the board. These are illustrated
on your wiring diagram below as striped
lines connecting different eyelet holes. Use
your yellow cloth-covered wire and cut each
piece to size. Insert leads and bend around
front of eyelet board to secure them.
PRO Tip: Make a small hook with the wire so
that the wire “hooks” into the eyelet.
100K
100 uF
1n4007
22K
15 K
1 K
1M
1M
1M
1M
1M
47 Ω
56 K
56 K
1 K
220 K
220 K
220 K
25 uF
+
25 uF
+
25 uF
+
25 uF
+
25 uF
+
25 uF
+
3.3 K
100K
100K
100K
100K
100K
2.7 K
1.5K
1.5K
1.5K
1.5K
2.2 K
500 pF
0.1 µF 0.1 µF
0.01 µF0.01 µF
0.02 µF
0.0033 µF
0.1 µF
0.022 µF
0.022 µF
0.022 µF
470K
3.3 M
250 pF
0.1 µF
0.047 µF
10 pF
10 pF
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13WWW.MOJOTONE.COM
100K
100 uF
1n4007
22K
15 K
1 K
1M
1M
1M
1M
1M
47 Ω
56 K
56 K
1 K
220 K
220 K
220 K
25 uF
+
25 uF
+
25 uF
+
25 uF
+
25 uF
+
25 uF
+
3.3 K
100K
100K
100K
100K
100K
2.7 K
1.5K
1.5K
1.5K
1.5K
2.2 K
500 pF
0.1 µF 0.1 µF
0.01 µF0.01 µF
0.02 µF
0.0033 µF
0.1 µF
0.022 µF
0.022 µF
0.022 µF
470K
3.3 M
250 pF
0.1 µF
0.047 µF
10 pF
10 pF
{Once jumper wires are in place, follow
wiring diagram to create leads where necessary.
These will be the wires that go out from the
component board to other components in the
circuit. Insert these leads down through the front
of the board and bend around back to secure.
PROTip: Use the included Wiring Diagram to
approximate lead lengths. The diagram is scaled
to be actual size of the chassis and components.
{Once all components, jumpers, and leads
are in place, start at one end of the board and
begin soldering every eyelet hole.
{Make Sure you don’t have any bad or “cold”
solder joints by lightly pulling each wire after
solder has set.
CIRCUIT BOARD INSTALLATION
{Locate the two small ber board
mounting holes drilled into the top left corner
of the chassis.
{Align the mounting holes on the backer
board and diode board (with the backer board
on the bottom).
{Insert a 6-32 screw into both mounting
holes on the boards.
{Install the two boards with the screws
into the chassis.
{Install 6-32 keps nuts on the outside of
the chassis and tighten.
{Repeat the same procedure with the
main ber board.
{Once in place, fasten down the screws
and nuts using a screwdriver and adjustable
wrench.
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mounting holes
for main circuit board
mounting holes
for tube rectier board
completed circuit
boards
backer boards

BUILD. MODIFY. REPAIR.14
SECTION 10:
WIRING THE SOCKETS,
JACKS & POTS
WIRING TUBE SOCKETS
{Twist tightly together a length of about
5’ of White and Black 22 gauge wire to start
wiring the tube laments. Starting with the
pilot light, connect the White wire to one
terminal and the Black wire to the other
terminal. From there, connect the White
wire to pin 7 of the power tube closest to the
rectier tube. Connect the Black wire to pin
2 on the same power tube socket.
{Install a 100 ohm resistor to each tab on
the pilot light to the bottom left eyelet on the
diode board.
PRO Tip: Make sure the power tube laments
are “in phase”. This means that the lament
wires (White and Black twisted wire running
between the power tubes sockets) must
connect to the corresponding pins between
the sockets. Pin 2 to pin 2, Pin 7 to pin 7.
Preamp tubes do not have to be in phase. For
a more vintage correct look use the Green 18
gauge wire.
PRO Tip: Since there is a wire connected to the
5 pin, you can achieve the jumper wire to pin
4 by stripping the wire back a little further,
running it through pin 5 and loop it in to pin
4. Solder the wire to both pins. Use this meth-
od on any jumper on the tube sockets.
Blackface Style Princeton Reverb
Revision 2.0
04/02/2019
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SPEAKER JACK
J12A 1/4“
A/C POWER SWITCH
VIBRATO PEDAL
A/C POWER CORD
1 AMP FUSE HOLDERGROUND SWITCH
EXTERNAL
SPEAKER JACK
J12A 1/4“
BASS
250 KA
REVERB RECOVER / MIX
9 PIN SOCKET
12AX7
VIBRATO / PHASE INVERTER
9 PIN SOCKET
12AX7
15 K
1 K
1M
1M
1M
1M
47 Ω
56 K
56 K
1 K
220 K
220 K
220 K
25 uF
+
25 uF
+
3.3 K
100K
1.5K
1.30 v1.30 v2.05 v220 v17.7 v
100 uF
0.1 µF 0.1 µF
0.01 µF0.01 µF
0.02 µF
0.1 µF
0.022 µF
1n4007
6.8 K
22K
100Ω
100Ω
Blackface Style Princeton Reverb
04/02/2019
68K
1M
12
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1
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7
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12
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68K
INTENSITY
250 KL
INPUT JACKS
J12A 1/4“
SPEAKER JACK
J12A 1/4“
A/C POWER SWITCH
VIBRATO PEDAL REVERB PEDAL REVERB OUTPUT REVERB INTPUT
1 AMP FUSE HOLDERGROUND SWITCH
EXTERNAL
SPEAKER JACK
J12A 1/4“
SPEED
3M RA REVERB 100 KL BASS 250 KA TREBLE 250 KA VOLUME 1 MA
15 K
1 K
1M
1M
1M
1M
1M
47 Ω
56 K
56 K
1 K
220 K
220 K
220 K
25 uF
+
25 uF
+
25 uF
+
25 uF
+
25 uF
+
25 uF
+
3.3 K
100K
100K
100K
100K
100K
100K
100K
2.7 K
1.5 K
1.5 K
1.5 K
1.5 K
2.2 K
500 pF
1.30 v1.30 v1.26 v
-31 v
150 v 150 v8 v146 v144 v1.30 v1.30 v2.05 v220 v17.7 v50.3 v180 v390 v
328 vac
100 uF
0.1 µF 0.1 µF
0.01 µF0.01 µF
0.02 µF
0.0033 µF
0.1 µF
0.022 µF
0.022 µF
1n4007
6.8 K
0.022 µF
22K
470K
3.3 M
250 pF
0.1 µF
0.047 µF
220 K
15 K
INDICATOR LIGHT
POWER TUBE SOCKETS
POWER TUBE SOCKETS PREAMP TUBE SOCKETS

15WWW.MOJOTONE.COM
Blackface Style Princeton Reverb
Revision 2.0
04/02/2019
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SPEAKER JACK
J12A 1/4“
A/C POWER SWITCH
VIBRATO PEDAL
A/C POWER CORD
1 AMP FUSE HOLDERGROUND SWITCH
EXTERNAL
SPEAKER JACK
J12A 1/4“
SPEED
3M RA REVERB 100 KL BASS 250 KA
15 K
1 K
1M
1M
1M
1M
56 K
56 K
1 K
220 K
220 K
220 K
25uF
+
25uF
+
3.3 K
100K
-31 v
100 uF
0.1 µF 0.1 µF
0.01 µF0.01 µF
0.02
µ
F
0.1 µF
0.022 µF
1n4007
22K
100Ω
100Ω
{Follow the wiring diagram and begin
wiring the tubes sockets starting from the
power tubes and work your way across the
chassis towards the preamp tubes.
PRO Tip: When running wires in the preamp
section of the amplier, pay attention to the
lead dress. Make sure that the leads going
from the eyelet board are short and neat.
Keeping the signal wires from the tremolo
circuit clear from the reverb recovery and
mixer stage.
68K
1M
12
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56
7
8
68K
INTENSITY
250 KL
INPUT JACKS
J12A 1/4“
SPEED
3M RA REVERB 100 KL BASS 250 KA TREBLE 250 KA VOLUME 1 MA
15 K
1 K
1M
1M
1M
1M
1M
47 Ω
56 K
56 K
1 K
220 K
220 K
220 K
25uF
+
25uF
+
25uF
+
25uF
+
25uF
+
25uF
+
3.3 K
100K
100K
100K
100K
100K
100K
2.7 K
1.5 K
1.5 K
1.5 K
1.5 K
2.2 K
500 pF
386v
0.1 µF 0.1 µF
0.01 µF0.01 µF
0.02
µ
F
0.0033 µF
0.1 µF
0.022 µF
0.022 µF
6.8 K
0.022 µF
470K
3.3 M
250 pF
0.1 µF
0.047 µF
POWER TUBE SOCKETSRECTIFIER TUBE SOCKET
EXTERNAL
SPEAKER
JACK
PHASE INVERTER /
TREMELO MIXER / REVERB RECOVERY REVERB DRIVER 1ST GAIN STAGE / 2ND GAIN STAGE

BUILD. MODIFY. REPAIR.16
Blackface Style Princeton Reverb
04/02/2019
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MOJO 772
OUTPUT
TRANSFORMER MOJO 776
REVERB
DRIVER
POWER TUBE
OCTAL SOCKETS
6V6
PREAMP TUBE
9 PIN SOCKET
12AX7
REVERB SEND
9 PIN SOCKET
12AT7
SPEAKER JACK
J12A 1/4“
A/C POWER SWITCH
VIBRATO PEDAL REVERB PEDAL REVERB OUTPUT REVERB INTPUT
1 AMP FUSE HOLDERGROUND SWITCH
EXTERNAL
SPEAKER JACK
J12A 1/4“
REVERB RECOVER / MIX
9 PIN SOCKET
12AX7
VIBRATO / PHASE INVERTER
9 PIN SOCKET
12AX7
15 K
1 K
1M
1M
1M
1M
1M
47 Ω
56 K
56 K
1 K
220 K
220 K
220 K
25 uF
+
25 uF
+
25 uF
+
25 uF
+
25 uF
+
25 uF
+
3.3 K
100K
100K
100K
100K
100K
100K
100K
2.7 K
1.5 K
1.5 K
1.5 K
1.5 K
2.2 K
500 pF
1.30 v1.30 v1.26 v 150 v 150 v8 v146 v144 v1.30 v1.30 v2.05 v220 v17.7 v50.3 v180 v390 v
328 vac
386v 386v
100 uF
0.1 µF 0.1 µF
0.01 µ
F
0.01 µF
0.02 µF
0.0033 µF
0.1 µF
0.022 µF
0.022 µF
1n4007
6.8 K
0.022 µF
22K
470K
3.3 M
250 pF
0.1 µF
0.047 µF
220 K
10 pF
68K
1M
68K
WIRING POTENTIOMETERS & INPUT JACKS:
{Prepare the bus wire that will mount
across the back of all the pots. Start from the
“INTENSITY” control on the left side and
solder the wire on the back of each pot. This
will provide a place to run to ground since the
pots are all grounded to the chassis.
{Follow the wiring diagram and begin
wiring the pots on the front of the chassis.
Start from the left “INTENSITY” control and
work your way across the chassis towards the
input jacks.
{Prepare the four Green wires and
connect from the board to the ground buss
wire that is installed on the back of the pots.
{Install a 1M resistor on the INPUT #1
from the ground lug to the tip lug. Install a
jumper wire or use the lead of the resistor to
connect from the ground lug to the middle
lug of the same jack. Connect the tip lug of
INPUT #1 to the middle lug of INPUT #2
with a jumper wire or use the lead from the
1M resistor.
{Install one 68K resistor on the tip lug
of INPUT #2. Install one 68K resistor on the
middle lug of INPUT #2. Be sure to install
the resistor so that the body is close to the
lugs.
{Twist the unused leads of the two 68K
resistors together.
{Make a hook on the end of the Red wire
and hook it where the 68k resistors are twisted
together. Solder them together. Clip the extra
leads left over from the 68K resistors. Make
sure that this connection is not touching the
chassis. You use a piece of heat shrink at this
joint to keep it from grounding out on the
chassis.
INPUT #1INPUT #2

17WWW.MOJOTONE.COM
Blackface Style Princeton Reverb
Revision 2.0 04/02/2019
68K
1M
12
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68K
MOJO 772
OUTPUT
TRANSFORMER MOJO 776
REVERB
DRIVER
RECTIFIER TUBE
OCTAL SOCKET
GZ34S
POWER TUBE
OCTAL SOCKETS
6V6
PREAMP TUBE
9 PIN SOCKET
12AX7
REVERB SEND
9 PIN SOCKET
12AT7
INTENSITY
250 KL
INDICATOR LIGHT INPUT JACKS
J12A 1/4“
SPEAKER JACKS
J12A 1/4“ J11 1/4”
A/C POWER SWITCH
A/C POWER CORD
1 AMP FUSE HOLDERGROUND SWITCH
SPEED
3M RA REVERB 100 KL BASS 250 KA TREBLE 250 KA VOLUME 1 MA
REVERB RECOVER / MIX
9 PIN SOCKET
12AX7
VIBRATO / PHASE INVERTER
9 PIN SOCKET
12AX7
15K
1 K
1M
1M
1M
1M
1M
47 Ω
56 K
56 K
1 K
220 K
220 K
220 K
25uF
+
25uF
+
25uF
+
25uF
+
25uF
+
25uF
+
3.3 K
100K
100K
100K
100K
100K
100K
100K
2.7 K
1.5K
1.5K
1.5K
1.5K
2.2 K
500 pF
1.30 v1.30 v1.26 v
-31 v
150 v 150 v8 v146 v144 v1.30 v1.30 v2.05 v220 v
328 vac
328 vac
386v 386v
100 uF
0.1 µF 0.1 µF
0.01 µF0.01 µF
0.02 µF
0.0033 µF
0.1 µF
0.022 µF
0.022 µF
1n4007
6.8 K
0.022 µF
22K
100Ω
100Ω
470K
3.3 M
250 pF
0.1 µF
0.047 µF
220 K
15K
Blackface Style Princeton Reverb
Revision 2.0 04/02/2019
68K
1M
12
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56
7
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12
3
4
56
7
8
12
3
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56
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68K
MOJO 772
OUTPUT
TRANSFORMER MOJO 776
REVERB
DRIVER
RECTIFIER TUBE
OCTAL SOCKET
GZ34S
POWER TUBE
OCTAL SOCKETS
6V6
PREAMP TUBE
9 PIN SOCKET
12AX7
REVERB SEND
9 PIN SOCKET
12AT7
INTENSITY
250 KL
INDICATOR LIGHT INPUT JACKS
J12A 1/4“
SPEAKER JACKS
J12A 1/4“ J11 1/4”
A/C POWER SWITCH
A/C POWER CORD
1 AMP FUSE HOLDERGROUND SWITCH
SPEED
3M RA REVERB 100 KL BASS 250 KA TREBLE 250 KA VOLUME 1 MA
REVERB RECOVER / MIX
9 PIN SOCKET
12AX7
VIBRATO / PHASE INVERTER
9 PIN SOCKET
12AX7
15K
1 K
1M
1M
1M
1M
1M
47 Ω
56 K
56 K
1 K
220 K
220 K
220 K
25uF
+
25uF
+
25uF
+
25uF
+
25uF
+
25uF
+
3.3 K
100K
100K
100K
100K
100K
100K
100K
2.7 K
1.5K
1.5K
1.5K
1.5K
2.2 K
500 pF
1.30 v1.30 v1.26 v
-31 v
150 v 150 v8 v146 v144 v1.30 v1.30 v2.05 v220 v
328 vac
328 vac
386v 386v
100 uF
0.1 µF 0.1 µF
0.01 µF0.01 µF
0.02 µF
0.0033 µF
0.1 µF
0.022 µF
0.022 µF
1n4007
6.8 K
0.022 µF
22K
100Ω
100Ω
470K
3.3 M
250 pF
0.1 µF
0.047 µF
220 K
15K
WIRING REVERB AND TREMELO JACKS
{Connect a 220K resistor to the center
pin of the Reverb pedal jack on the back of
the chassis, and solder the other end of the
resistor to the ground lug of the same jack.
{Connect and solder a small jumper wire
from the center pin of the Reverb Output jack
to the center pin of the Reverb Pedal jack.
{Connect and solder a piece of wire from
the center pin of the Reverb Pedal jack to pin
2 of the V3 (Reverb Recover / Mix preamp
tube).
{Connect and solder the blue wire from
the eyelet board to center pin of the Vibrato
Pedal jack.
WIRING CAN CAPACITOR
{On the can capacitor, each terminal has
a letter stamped in it indicating which value
each terminal is for. “Y” is 40uf, “X, “U” &
“O” are 20uf capacitors. The terminal with
“I” is the ground terminal. Connect a small
jumper wire from this terminal to one of the
ground lugs. Follow the wiring diagram to
the right connecting each terminal to the ap-
propriate eyelet location.
{Connect the Red wire from the output
transformer to the bottom left eyelet on the
eyelet board where the yellow wire from
the can capacitor and 1K 2W resistor are
connected.
Install Power Cord
{Strip off about 6” of the outer insulation
on the end of the power cord without the
plug. Insert the cord through the back of the
chassis so that there is enough length for the
white wire to reach the power switch.
{Attach the black strain relief on the power
cord outside of the chassis about 1” away
from the chassis. Make sure the tapered end
is facing towards the chassis. Take a pair of
pliers and squeeze strain relief on the power
cord, keeping it compressed, insert the strain
relief into the chassis until it locks into place.
Blackface Style Princeton Reverb
Revision 2.0 04/02/2019
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12
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12
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56
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15 K
1 K
1M
1M
56 K
56 K
1 K
220 K
220 v17.7 v
50.3 v180 v390 v
386v 386v
0.1 µF 0.1 µF
VIBRATO PEDAL REVERB PEDAL REVERB OUTPUT REVERB INPUT
FUSE HOLDER POWER SWITCH
A/C POWER CORD
CAN
CAPACITOR

BUILD. MODIFY. REPAIR.18
SECTION 11:
Speaker Wiring &
Installation
SPEAKER WIRING:
{Twist the two 15” lengths of Black and
White 18 gauge stranded wire together.
{Push the insulation back about 1⁄2” from
both wires on one end and tin them.
{Unscrew the back of the 1⁄4” right angle plug.
{Solder the tinned wires to the plug,
White to center and Black to shield. Then
reinstall the back.
{Push back the insulation on the other
end of the wires by 1⁄4” and tin them.
{On the other end of the wiring harness,
push back the insulation on the wires by 1⁄2”,
twist and tin them.
{With a pair of needle nose pliers, take
the tinned wire and make a small “hook” on
both the White and Black wires.
{Insert the White wire “hook” into
the positive (+) terminal on the back of
the speaker. Use the needle nose pliers to
carefully crimp the “hook” on the terminal,
forming a mechanical connection. Then
solder the wire to the terminal. Repeat the
same process with the Black wire on the
negative (-) terminal.
SPEAKER INSTALLATION:
{Remove the upper and lower back panel of
the cabinet.
{Remove the four Keps nuts from the
speaker studs on the bafe.
{With the cabinet laying face down, line
up the mounting holes on the speaker with
the studs on the bafe and carefuly instal the
speaker onto all four studs at the same time.
{Finger tighten the mounting speaker
screws starting with the top left screw, tighten
with a screwdriver, then tighten the screw
diagonally from it. Then tighten the remaining
screws in the same way.

19WWW.MOJOTONE.COM
SECTION 13:
Initial Chassis Testing
{Starting from the left side of the chassis,
ensure all solder joints and connections are
good.
{Physically inspect every tube socket
closely, making sure there are not any extra
wires touching other pins.
{Look and listen for loose hardware by
shaking chassis.
{Ensure chassis is free from debris before
plugging in. Check for pinched or burnt wire
insulation.
{Adjust lead dress so it is easy to see
components.
{Power amp on without the tubes installed.
{Using a multimeter set to AC voltage,
Check the power transformer secondary AC
voltages (at tube socket for laments). This
will be pins 4+5 and pin 9 on the preamp
tubes and pins 2 and 7 on the 6V6.
{Turn amp off and install the GZ34
rectier tube.
{Turn amp on and allow it to warm up
(approximately one minute). Watch for any
kind of arcing or smoke from any component
or transformer. If you see anything, shut down
the amp immediately. Disconnect the amplier
from wall socket, check voltages on the lter
capacitors (DC voltage), make sure they are
drained, and then recheck your wiring.
{Set your multimeter to its highest DC
Voltage setting. Attach the ground / common
probe to the metal chassis.
{With one hand, take the positive (Red)
probe and carefully measure the voltage
on pin 8 on the rectier tube socket. Then
measure the voltages at four terminals on
the can capacitor labeled O, U, X & Y. The
voltages will be higher than the voltage
readings on the wiring diagram due to the
remaining tubes not being installed in the
circuit. If you do not have voltages at these
points, power down the amplier, allow the
capacitors to drain, DO NOT short them to
ground as this can damage the capacitors
or cause them to explode. Test with your
multimeter to make sure the voltages are
below 10V DC before working on the amp.
{Turn amp off. Remember, if you have
not drained the capacitors, there are still high
voltages present.
{Install the preamp tubes. Note the
correct socket that the 12AX7s and 12AT7
tubes go into. Then power up the amplier
and ensure the laments are working. Check
the B+ voltages on pin 1 and pin 6 of the
preamp tubes.
{Turn amp off. Install the output tubes,
make sure when installing the tubes that
you like up the guide pin correctly. Plug the
speaker into the speaker jack that is closest to
the On / Off power switch.
{Turn the amp on and check for proper
lament operation on the power tubes.
{Check the voltages at the test points on
the wiring diagram. Check the voltage on
pin 5 of each 6V6 tube. Ensure the voltage
reading near ¯~40v. If the voltage is less than
¯25 or if you are reading a positive voltage,
power down the amplier immediately and
double check the wiring on the bias board as
well as the orientation of the diode.
PRO TIP: Red plating occurs when too much
current is applied to the plate (anode) of a
vacuum tube. It will overheat and glow cher-
ry red. Turn the power off immediately if this
happens.
{Let the amp idle on for half an hour or so
for the chassis to be warm and do the bump
test.
PRO TIP: A bump test is exactly what it means.
Use a non conductive tool, such as a wood-
en handle of hammer or plastic handle of a
screw driver, to hit the edge of the chassis or
pick your amp up about an inch and drop it.
Don’t worry it won’t harm your amp. This
helps you test for bad solder joints and any
loose hardware as well as lets you know if
there is a physical problem with one of your
tubes.
SECTION 12:
Reverb Cable Wiring
{Reverb wiring should consist to two
piece of wire, one about 3’ and the other
about 5’.
{Un-braid the outer external braiding on
the reverb wire about 1.5” leaving the center
wire and insulation in place.
{Strip 1/2" of the internal wire. Twist the
stranded wires together tightly.
{Insert the internal wire into the RCA
plug from the bottom until it comes out the
center about 1/4”.
{Solder the tip of the RCA plug and wire.
Clip off excess wire.
{Push the external braiding up against
the shield of the RCA plug.
{Twist the un-braided portion together
and solder to the back of the RCA plug.
{Repeat for the other end and other cable.

BUILD. MODIFY. REPAIR.20
SECTION 14:
Chassis & Reverb
Installation
Chassis Installation
{Make sure that the 4 mounting holes in
the chassis are clear of any stray wires so
that they are not damaged or short against the
mount screws.
{Install the chassis into the cabinet from
the rear. The faceplate should line up with the
front edge of the speaker bafe.
PRO TIP: Be mindful of tweed and tolex
when installing. Use painter’s tape if you
need to at pinch points for the cab, as it can
protect from tearing or lifting up the tweed
covering.
{Install chassis straps and screws through
the top of the cabinet.
{Tighten the screws and keps nuts using
a screwdriver and adjustable wrench. As they
are tightened, the chassis will pull up towards
the top of the chassis.
{Install the white cord strain relief to the
side of the cabinet using #6 screw.
{Plug speaker into speaker jack that is
closest to the power tubes
Reverb Tank Installation
{Connect the shorter reverb cable to
the “OUT” connection on the reverb tank.
Connect the longer to the IN connection on
the reverb tank.
{Remove any foam blocks from inside the
reverb tank.
{Carefully slide the reverb tank into the
reverb bag oriented with the ap on the top.
{Place the reverb bag into the bottom of
the cabinet so that the wires are on the same
side as the input jacks of the amp.
{Use (2) #6 Screws to secure the reverb
bag to the cabinet.
12AX7 12AX7
12AX7 12AX7