Revere T-II User manual

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GENERAL INFORMAT ION
The "Revereff Model T-11 Tape Recorder features fingertip operation for Stop, Play,
Speaker, and Record modes of operation merely by pressing a key, The rRevererr also incorpo-
rates a Rapid Forward-Rewind Lever, this lever is used to skip ahead to any point on the tape
or to rewind tape onto the supply reel. This lever.can be moved while the recorder is in any
function and any previously depressed key will be autornatically disengaged.
Two neon recording indicators simplify the recording lever setting. New recordings can
be made on previously recorded tape since the erase head is automatically connected when the
"Record" key is pressed or the same recording may be played back indefinitely.
This recorder is of the dual-track type, giving two full length recordings on a single reel
of recording tape. Any size reel up to 10/2" can be used.
The " Revere, T-I1 is designed to operate on 60 cycle, 105 to 120 volts, AC supply only.
Manufactured by:
Revere Camera Company
Chicago 16, lllinois
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R,EVERE
MODET TII
ffiis moleriol compiled ond published by
3ANS & GO., INC., INDIANAPO LIS, INDIANA
Copyrighl 1958 . All Rights Reserved
$I 386
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TABLE OF CONTENTS
General Information . .
Specifications ..,.
Ftnctions of:
Controls, lndicators, & Switches . .
Connecting The T-11 To IIi-Fi Systems
Operatinglnstructions ......
Disassembly Instructions
Preliminary Tests-Repair Procedure. . .
Mechanical Adjustments
Electrical Adjustments .
Cleaning I
Lubrication. . I
Exploded View g
Mechanical Troubles 10
Function Switch Operation 10
ElectricalTroubles... .....11
Electrical Parts List .
Schematic. .
Mechanical Parts List
I
2
3
4
4
7
7
7
I
13
15
16
N.A.R.T.B.
REEI I{UB
ADAPTORS
REEL SPINDLE RECORD BIA5.
LOCK ERASE INDICATOR
RAPID FORWARD
REWIND TEVER
MANUAL
STOP TTVER TAPE
TENSION ARM
PITOT TIGHT
oN-oFF 5W
MIKE.RADIO.
PHONO INPUT
VOTUME
CONTROT
NORMAT
INDICATOR FUNCTION
KEYS TONE
CONTROT
TAPE
COUNTER DISTORTION INDICATOR RECORD
KEY IOCK
The Revere Model T-11 Tape Recorder features
simplified fingertip oper.ation for "Stop", "PIay",
"Speaker", and "Record". This unit is designed tore-
cord two tracks of material on standard width record-
ing tape, which doubles the playing time of a reel of
tape with no loss of frequency response or quality.
Recordings can be made from a microphone, phono-
graph, AM-FM tuner, or from a television receiver.
Recordings .can be played through an existing home
music system or through an efficient speaker by con-
necting it to the "Monitor Output" jack.
CAUTION: Do not use on direct current. Check name
plate at rear of machine for proper e-urrent
and voltage.
Figure I
GENERAL DESCRIPTION
SPEC IFICATIONS
Fbequency Response - 40 to 16,000 cps, * Bdb.
Tape Speed - 7 l/2 ips.
Signal To Noise Ratio - greater than 50 db.
lVow and Flutter - lese than 0.2%.
Over-AII Harmonic Distortion - 0.65%"
Over-AlI Intermodulation Dietortion - less than 2.5%.
Page 2
Size .- top panel 19't x 14", depth 9" over-all.
Power Requlrements - 10S to 120 volts, 60 cycles.
Power Consumption 120
watts.
Weight of Recorder - 34 lbs.
Reel Slze - up to lO t/2,,.

Figu re 2
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FUNCTIONS OF CONTROLS,
0n-Off Switch
&Ioving this switch to the ttOn'r position altrows
power to be supplied to the entire recorder.
Volurne Control
This control regulates the volum e when re -
cording, and also when playing back through the Monitor
Output. When ptaying through an external system con-
neeted from the Pre-amp Output jack, thiscontrol has
no effect, and volume must be controlled at the ex-
ternal system.
Tone Control
This control is designed to give tonal extremes,
and can be varied to produce a blend of tone suitable
to any type of program. Whenever recordings are
played back through an external systern, this control
should be placed in the "Hi-Fi'o sector and then the tone
control on the external system adjusted for the de-
sired tonal blend. The tone control is switched out of
the circuit when recording.
Fu nction Keys
AII electrical and rnechanical functions for PIay
and Record operations are performed by the function
IND ICATORS, & SW ITCI.IES
keys. AIso, for convenience and protection, the mech-
anism is returned to the "Stop" position whenever the
"Rapid-Forward Rewind tever" is actuated.
Rapid Forwa rd- Rewi nd l-ever
This lever is used to skip ahead to any point on
the tape or to rewind tape onto ttre suppty reel. By
moving this lever back and forth, the tape can be inehed
along in either direction to find an exact point on the
tape. This lever can be moved while the recorder is
in any function and any previously depressed key will
be automatically disengaged.
Record Key Lock
This is a safety feature which locks the "Record"
key to prevent accidental erasure. To actuate the "Re-
cord" key, the "Record Key lock" must be moved to
the right before depressing the "Record" key.
Record Level I ndicators
Adjust t}e volume so that the "Normal" indicator
flashes and the "Distorted" indicator is on the verge of
flashing on the loudest peaks. The indicators also }ight
in "PIay" and may be used to show relative playback
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volume, but the "Normal" and "Distorted" markings
apply only when recording.
Manual Stop Lever
This lever can be used to instantly stop the tape
while in either "PIay" or "Record" position. This en-
ables precise setting of the record level before start-
ing a recording, and also allows editing of unwanted
breaks or commercials. In playback, this lever is
useful for transcribing and editing.
CONNECTING THE T-II
1. Connect the recorder's "pre-Amp. Output"
to the Hi-Fisystem's Pre-Amp. Input (Usuallymarked
Tape, TV,or Auxiliary). Use standard phone plug and
shielded cable. Shield must be soldered to the body
terminal of each plug. The T-11 pre-Amp. Output
operates at a Ievel of one volt into impedances of 2b,000
ohms to two megohms.
2. Connect the recorder's Radio-phono Input to
the Hi-Fi System's Pre-Amplifier Output (a special
output for tape recorciing may be provided, if not, make
Threading The Tape
1. Place full reel of tape (glossy side out, i.e.
"A" wind) on left reel lock assembly and empty reel
on right reel lock assembly. If reels have the large
Page 4
Figure 3
lndex Counter
Set the counter to zero after a reel of tape has
been threaded on the recorder. After each selection
is recorded, note the counter readings for future re-
ference. In this way, the countercan be used tolocate
a pre-recorded selection on the tape.
Record Bias-Erase I ndicator
The Bias -Erase indicator lamp, located between
tape reels, Iights showing that the oscillator is properly
functioning.
TO HIGH FIDELITY SYSTEMS
connection across pov/er amplifier input). Use stand-
ard phone plug with shielded wire. Radio-phono Input
is 1 megohm, operates on0.0b-10 volts (1 voltnominal)
(-24VU to +22VU).
3. With the straight power cordrconnectthere-
corder to an outlet supplying voltageand frequency as
specified on the rear name plate. Switch controlled
outletsof most systemscan be used, in whichcase the
whole system must be switched on to operate the re-
corder.
OPERATI NG I NSTRUCTI ONS
N.A.R.T.B. center hole, place the N.A.R.T.B. reel hub
adaptors (1) on the reel lock assemblies (2), lift and
turn the reel locks (5) until splines lock between the
tiny raised dots on the hubs. Loek the large reels in
place by turning the wi:ogs on t}re N.A.R.T.B. reel hub

Figure 43
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MICROPHONE INPUT
(AUX. PHONO or RADIO
TIP NOT
CONNECTED MONITOR
( OUTPUT)
HEADPHONES
or SPEAKER
2 CIRCUIT PLUGS OUTPUT
TO
PRE-AMP
MONITOR OUTPUT
PRE-AMP OUTPUT INPUT FOR
RADIO-PHONO
OR TAPE
RADIO- PHONO INPUT
Figure 5. lnput And 0utput Connections.
Page 5

adaptors clockwise. Lock small reels by lifting reel
locks (5) and turning the splines half way between the
reel slots.
2. Unwind about 20" of tape from the reel. HoId
asectionof t}te tapestraight withboth handsand insert
the tape in the tape slot making sure the dull coated
side of the tape faces the rear of the recorder. Feed
the tape around the tape tension arm (12),as shown in
Figure 1, and into one of the slots in the empty reel.
Rotate t}te reel counter-clockwise until the tape is
secured to the reel.
How To Make A Recording From A
Hi-Fi System
1. Play a program or phonograph recordthrough
the Hi-Fi system. Set its tone controls mid-way be-
tween treble and bass, switch off any loudness control,
and adjust its volume control for comfortable listening.
2. Release record key lock by moving it to the
right. Depress the record key while holding back tlre
manual stop lever (36) with the left hand.
3. Set the recording levet by adjusting the re-
corder's volume control so that the "Normal" indicator
flashes and the "Distorted" indicdtor is on the verge
of flashing on tlre loudest peaks. Release manual stop
lever (36) to instantly begin recording.
NOTE: InmostHi-Fisystems using aseparatecontrol
PreAmplifier and Power Amplifier, the power
Amplilier has a screwdriver adjustment la-
beled "Input Level". Reduce its setting,if the
recorder volume control must be turned fully
on to set tlle proper recording level, or if the
Hi-Fi system is too loud at that point.
To Play Back Recordings
1. Move reqrind knob (11) to the left (it auto-
matically releases the record key and resets the reeord
key lock) and wind tape back to ttre original counter
setting. Return the rewind knob (11) to the center po-
sition to etop the reels.
2. Set the recorder "Tone Control" so that the
red dot is in the Hi-Fi sector,and turn thereeorder,s
"Volume Control" down.
3. Turn the eelector switch of the Ei-Fisystem
to the Input Channel conneeted to the recorder, and
press the "Play Key". Adjust the volume and tone con-
trols of tlre Hi-Fi system for desired listening level.
To Record From A Microphone
1. Insert microphone plug firmly into the "Mi-
crophone Inputf!.
2. Set t}recounter (37),slide therecord keylock
to the right, and dspress the record keyl Adjust the
I'Volume Contro|' so that the "Normal" lndlcator flash-
es while speaklnglnto themicrophone lna normaltone
of voice, To monitor recording, plug headphones (any
type) into "Monitor Output lack'l,and press'Speaker,
key.
Page 6
To Play Recordings Through The
T-lI Amplifier
The T-11 Recorder, without additional amplifiers,
can be a"building block"for r.noreelaborate futurein-
stallations, and yet give grati-fying performance in the
meantime. The'rMonitorOutput Jack"cansupply 2 1,/2
watts at 3-4 ohms, which is sufficient for ordinary
listening when an efficient speaker is used.
1. Connect an external speaker equipped wittr a
standard phone plug into the "Monitor Output Jack".
2. Depress the "Play" and ,,Speaker', keys and
adjust the f'Volumet'and "Tone" controls for desired
listening leveI.
To Record Directly From AM-FM Tuner
0r Phonograph
1. Connect the Tuner or Phonograph into the
"RadiePhono Input" on the rear panel, or to the "Micro-
phone-Phono Input" on the front panel (both inputs are
in parallel). To do this, attach a standard phone plug
to a shielded cable and attach to the Tuner or pnono-
graph. The shield must be soldered tc the body ter-
minal of the plug. Low level magnetic cartridges such
as G.E. or Pickering must operate through their pre-
amplifiers.
2. Connect the speaker voice coil terminals to
the "Monitor Output Jack" on tlte rear panel. To do
this,attach a standard phone plug using #18 lampcord
to the speakerror use the gray attachment cord which
ls furnished witll the unit. polarity is not important.
3. Depress the speaker key and turn up the re-
corder's volume control to hear the program.
4. Thread the recorder and proceedwith tfie re-
cording as previously described under "IIow To Make
A Recording From A Hi-Fi Systemtr. press speaker
key again after pressing record key to monitor re-
cordings.
5. To play recordlng, rewind the tape to the
original counter setting. press play key and adjust
recorder'g "Volume" and "Tone"controls for deeired
listening level.
Twin Track Recording
1. Revere Recorders are designed so that each
reel of tape holds two full lepgth recordlngs, one on
each half of the dirlt side of the-tape.
2. After the flrst track has been recorded, a
second recordtng can be madeon thesame tape byre-
movfung the reels from the recorder, turning them over,
and placing on opposlte spindles.
3. Threadthe tapeand proceed wlth therecord-
tng.
4. After the second track has beenreborded, the
first track is ready to be played, wtthout rewtndtng, by
changtng reels as described ln step No. 2.
a

Fast Forward
1. /rny portion of a recordlng may be skipped,
or any selection may be located tn a few seconds by
moving the high speed knob (1f) to the right. A few
seconds of "Fast Forward" is equivalent to several
minutes of playing time.
2. By movlng knob (11) back and forth the tape
can be inched along to an exact point.
3. After reaching the deslredportlon of the tape,
move the high speed knob(11) to the middleor neutral
position to stop all tape movement.
NOTE: The fast forwardor rewind mechanism can be
engaged at any time while the recorder is in any
function, and any previously depressed keys
will lutomatically di.sengage.
To Remove Top Plate Assembly
l. PulI off "Volume" and "Tone"control knobs.
2. Remove screw at rear of high speed knob (1 1).
3. Remove five serews (8) from the top plate.
4. Turn until loose, 2 screurs, one above the
"Microphone Jack" and tfie other above the "Normal"
indicator.
5. Remove reel spindles by removing their 3-
screws.
6. Depress the record key and pry the record
key lock to the left and remove top plate.
D I SASSEMBLY I NSTRUCT IONS
PRELIMIMRY TESTS - REPAIR PROCEDURE
To Remove Mechanism From Amplifier
1. Unplugthe play-record-erase head cableplug
and motor plug. The motor plug is located on the bottom
of the chassis near the solenoid.
2. Remove four screwsrtwo on each perforated
side plate and carefully lift out mechanlsm.
After servicing the unit, inspect visually for
signs of damage and wear, and mahe certaln all parts
are in their proper place and properly adjusted. Re-
assemble by reversing the procedure outlined above
being careful that the motor and head leads will be
clear of all moving parts. 3
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TEST PROCEDURE: FAILITRE TO PASS ANY OF
TIIESE TESTS INDICATES A FAULT THAT SEOULD
BE REMEDIED.
1. Remove front and rear plastic head covers
by pulling up. Clean head, tape guides, and capstan
with alcohol.
2. Press "Stop" key. Place high speed knob (11)
in the middle or neutral position. Place on-off switch
in the "On" position.
3. Thread tape on recorder. Brakes should be
engaged. Pull required on reel should not distort the
tape andshould offer sufficient drag topreventspilling
of tape. Drop tape into threading slot. Attach free end
of tape to take -up reel (right). Reel should rotate free -
ly counterclockwise and drag when rotated clockwise.
4. Press "Play" key, "Speakert'key should also
depressand both should latch down. "Stop"key should
release. ReeI spindlebrakesshould release. Solenoid
should energize. Felt pressure pads should press
square against tape and cover shiny pole face area
under tape. Pressure roller (44) should contact cap-
stan, and tape should move past plaf rec ord-eras e head
(25) at playing speed. Take-up reel should wind up
tapeas it passes the capstan. Thecounter should tally
each revolution of the supply reel.
5. Move highspeed knob(11)to theright. Check
to see that moving the knob releases "Play" and
"Speaker" keys and latches down I'Stop" key. Pressure
roller and pressure pads should be released. Tape
should move forward at greatly increased speed.
6. Return high speed knob (11) to the middle or
neutral position. Solenoid and pressure pads should
remain disengaged. "Stop" key should remain down.
There should be no spilling of tape. If tape spills, see
'rStop Key Adjustment".
7. Move "Record Key Lock" to right. Press
"Record" key. Make a mierophone recording. Adjust
"Volumet' control while speaking so that "Normal"
indicator flashes and "Distorted" indicator does not.
8. Press "Speaker"key. Speaker should belive.
Press "Record" key again. "Speaker" key should re-
lease.
9. Move high speed knob (11) to the left. "Re-
cord" key should release.
10. Play back recording. Check volume, tone;
and overall quality.
11. Rewind tapeand re-recordover yourprevi-
ous recording. All traee of previous recordingshould
be erased on the portion of the tape re-recorded. Check
imegularities in playing speed (Wow and Flutter).
Check the action of the instant stop arm (36). Tape
should stop instantly. Upon releasing, tape should start
instantly and not spill off reels.
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Stop Key Adjustment
In switching ffom "Play" or "Record" to "Fast
Forward" or "Rewind", if the solenoid does not re-
Iease pressure roller (44), or if tape is spilled when
returning to the neutral position from "Fast Forward"
or "Rewind" by the solenoid re-engaging, check the
stop key adjustment as follows:
1. Turn stop key adjusting screw (Item bb Fig-
ure 2 ) a few turns counterclockwise, then press "play"
key. Move high speed knob (11) to either "Fast For-
ward" or "Rewind". Turn the stop keyadjustingscrew
(5 5) clockwise until the electrical function switch (saw -
tooth latch bar) just latches to the right. Turn an ad-
ditional l/4t:ctrn clockwise. If screw is turned too far
clockwise the high speed knob (11) wifl bind.
2. Check "Stop" key micro-switch. Switch is
located under the "Stop" key and is encased in fiber.
MECHAN I CAL ADJUSTMENTS
EI.ICTR ICAL ADJUSTMENTS
CUANING
NOTE: It may be necessary to adjust"stop"key when
replacing amplifier assembly.
Replacing Sound Head
1. After removing head spring retainer (22) tift
head and brass alignment plate from head shield cup.
Unplug head cable plug.
2. Pry head from brass alignment plate. Note
position of locating pins.
3. Place the head over the pins in the aligning
plate in the proper location and press into place.
4. Replace alignment plate into head cup. The
two brass pivot studs should engage the two holes in
the plate. Replace head retaining spring.
5. Align head azimuth as described in electrical
adjustments.
Play-Record-Erase Head
Azimuth Adjustment
It is very importantthat the head be lined upper-
fectly with the tape. If it is not, Iow outputand loss of
high frequencies wiU result. There is one adjustment
to be made, which is as follows:
1. For alignmentof the play-record-erasehead
a 1 mil alignment tapeshould beused. Thread tape on
unit and set controls in "play" position. Adjust head
for maximum playback sensitivity by turning adjust-
ment screw (Item 26 on Exploded View). In lieu of
alignment tape, play a previously recorded tape and
adjust head for maximum treble tone. After adjust-
ment is made, cement alignment screw (26) to lock
adjdstment.
Bias Adjustment
The bias is measured by placing a 100 ohm re_
sistor in series with the record element and measur ing
the voltage across this resistor with a meter capable
of accurately reading 0. 1 b Volts at a frequency of ?bKC.
Adjustment is made by means of the screwdriver ad_
justment onoscillator coil (L2). This screwis located
beneath the name plate on the rear panel. The above
value of bias will produce gptimum results on most
types of standarti tape presenily available.
High Frequency Equalization Adjustment
Incorporated in the.pre-amplifier circuit is a
core tuned peakingcoil (L1) thatadjusts0re htgh freq-
uency end point to compensate for long term head wear.
This equalization is effective in pliy back only since
headwear has a lesser effect on ttre recording procesa.
The screwdriver adjustment is Iocated on the chassis
between the large electrolytic and the l2AX? tube. Ad-
justment is made for flat recorded-played-back re-
sponse from 10to 16KC. Adjustmenthas been madeat
the factory for optimum performance and should not
require anyreadjustment forat least b00hours ofuse.
Before adjustment is attempted, the head should be
carefully cleaned with alcohol.
To make adjustment, record 10KC and 16KC
signals. Upon playing back these signals, adjust the
peaking coil core until the amplitude of the 16KC is
equal to the 10KC. Measure the signals at the pre-
amplifier output.
Hum Balancing Adjustments
Both record (R2) andplayback (RB) hum balancing
controls are provided to assure maximum sinal to
noise ratio. These controls havebeen factory adjusted
for optlnum performance. If adjustment is requlred,
screwdriver controls are located on the chassis near
tlrepower transformer. {g."t try reversing thepower
plug for minimum hum. Tlien with "Stop" and "Spsakst "
keys depreesed, adjust record hum control (nZ) fo"
minimum hum at fMonitor Amp. Output", volume Bet
at maximum. Ng*t, presa "play" key and adjuet the
forward control (R3) for mlnimum hum at elther the
"Monitort' or "Pre-Amp. Output".
The majorlty of defects, other thanwear or brealr
age,can be traced todirtysurfacee. The playrecord-
erase head (25),capstan, and preeeure roller (44) are
subJect to an a€cumulation of tape coattng residue,
which ig worn off the tape ae it passee thise parts.
Page 8
This accumulation ihnrttr be periodically removed
slnce lt will cause faint recordlng and poor playbach.
Wipe off the above eurfaces €erefully with a ctean clottr.
ff dirtis cakedor hard and will notcomeoff vitha dry
cloth, dampen cloth sUghtly wlth alcohol.

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Figure 6. Exploded View 0f Tape Transport Mechanlsm.

LUBRICATION
All moving parts in this recorder were perman-
ently lubricated at time of manufacture. Under normal
use further lubrication should not be required. In
heavy-duty service,the following parts should be lub-
ricated onee a year with a drop of #10 motor oil:
1. The top and bottom motor bearings.
2. The top and bottom flywheel (?1) bearings.
3. Pressure roller (44) bearing.
MECHANICAL TROUBLES
No Tape Drive ln Play 0r Record
1. Pressure roller spring (43) disconnected or
broken,resulting in pressure roller (44)not beingheld
in contactwith the capstan. Connect or replace spring
(43). 2. Motor pufley (11?) Ioose on motor shaft.
3. Idler tension spring (58) disconnected or
broken, thereby not holding idler wheel (60) in contact
witi motor pulley (11?) and flywheel (71). Connect or
replace spring (58).
4. Take-up belt (72) stretched or not properly
connected.
5. Check for oil on motor pulley (11?), idler
wheel (60),flywheel (?1),and take-up belt(?2). If nec-
essary, clean witlr alcohol.
No Fast Forward
(Check Fast Forward With Nearly Full Take-up Reel)
1. Check high speed lever (48) to see if it moves
approximately ?7b" to the right. This shouldallow idler
wheel (66) to be pulled by its spring (68) into contact
with high speed cup (88) and flywheel (71). A weak
spring (63), binding slide, or beht arm miy prevent
this. 2. Idler wheel (60) must be free toslide. It may
be necessary to increase tension on idler spring (bS).
3. Check for oilondrive gurfaces. If necessary,
clean with alcohol.
4. Cheek that pressure pads are disengaged.
No Rewind, 0K ln "Play" And
"Fast Forward"
1. Iligh speed lever (48) should move approx-
imately ?/8"tothe left. Rubber drivebelts (110) shoutd
contact motor pulley (11?).
2. Check take-up spindle for free rotation.
Brakee should be disengaged. Idler wheel (66) should
not be driving high speed cup (88).
3. Spring (106) disconnected or broken. Replace
spring (106).
Tape 0verruns 0r Spills When
Changing Functions
1. Brake arm sprlng (?3) disconnected or bro-
ken. Connect or replace sprlng (?3).
Page l0
4. A11 idler and drive wheel bearings.
5. The reel spindle bearings.
The baslc rule is - do not over lubricate. Oil
must bekept offall rubber idlers,belts,and periphery
of flywheel and off parts that might transfer oil to them.
Always wipe excess lubricant from parts that have been
Iubricated.
2. Brake roller spring (78)or (82) broken. Re-
place defective spiing.
3. Clutch felt (96) may be worn - replace.
4. Grease or oil on belis (110 or 8g) - clean
with alcohol.
Speed lrregularities (Wow and Flutter)
Check for binding in the following:
1. Flywheel bearings. Check by rhoving idler
wheels (60) and (66) awayfrom the flywheeland rotate
the capstan by hand. A small drag is normally obtained
from belt (72).
2. Pressure roller (44).
3. Check all idler and drive wheel bearings.
4. Checkleftandrightreelspindles. Thebrakes
should be disengaged or held away before turning spind-
les.
5. Motor bearings. Check by turning shaft by
hand.
Check to see tlat:
1. Supplyreel is freeto rotateand is notscrap-
ing top plate.
2. Rubber belts (110) touch motor pulley (11?)
only when in "Rewind" position.
3. Brakes are released.
4. Pressure roller (44) is making good contact
with eapstan.
5. Capstan is clean.
Check for irregularities:
1. Idler wheel surfaces.
2. Presgure roller (44) surface.
4. Takeuptension. Take-upclutchcanbecheck-
ed by holding right spindle while recorder is in "play"
position. The tension should be smooth without any
pulsations. If surface of take-up clutch felt (g0) is
gummy, it muet be replaced.

NOTE: Oil on anyof the foregoing drivesurfaces will
cause "WoC'.
lnsufficient Tape Take Up
1. Increase take up by adding another washer
(101). 2. Clutch felt (90) may be worn - replace clutch
felt.
Tape Squeak
Tape equeak is caused by faulty tape with in-
sufficient lubrication. Tape squeaking is accentuated
by high temperature and humidity. Squeaking can be
minimuzed by:
1. Cleaning headand pressurepads wlthalcohol.
2. Slightly decreasing pressure pad spring (29
or 31) tension.
"Stop" Key 6l) Pressed
Power to solenoid (122) interrupted, amplifier
connected to input jack, and output transformer (T2)
seeondary disconnected,
Speaker Key (53) Pressed
Connects secondary of output transformer to
Monitor Output lack (M4) for public address in"Stop"
position, or monitoring in "Record" position.
"Plat'' Key (50 Pressed
"Play-Record Coil" connected to first stage of
FUNCTION SW ITCH OPERATION
ELECTRICAL TROUBLES
amplifier input. "Speakerr key automatically actuated
with "Play'r key, tone control (RlB) operating.
"Record" (54) Key Pressed
"Play-Record Coil" connected to amplifier out-
put, bias-erase oscillator circuit functioning, and tone
sontrol disconnected. If "Speaker" key is pressed,
output is muted with 10Q resistor (R45). Record level
indicators (M6) and (M7) operate in all functions. Mon-
itoring of "Recording" may be accomplished by insert-
ing 3.4Q speaker in Monitor Output Jack.
Weak Playback Volume 0r No High
Frequencies
1. Check for dirty head (25). Clean head with
alcohol. (The plastic headcover is removed bypress-
ing below the word "Revere" and then prying up.)
2. Check pressure pads.
3. Wrong typeof tapeor wind. (DuIIsideof tape
should be wound 'rinrr - "A" wind.)
4. Check head azimuth adjustment (Page 8).
5. Head may bewornbadly or needreplacement.
6. Check adjustment and condition of (L1), if
only pre-amp output is defective.
'Recorder Dead, Pilot Light ffi9) Off
1. Check fuse (M10). Cause of blown fuse may
be shorted 6X5GT (V6) or unit plugged into D.C. or
220 vAc.
2. Check power.cord and on-off -switch (M11).
Public Address Volume Wealg Distorted, 0r
Dead (Stop & Speaker Keys Depressed)
1. Try another microphone, radio, etc., to see
whether the input source is defective. Plug a 3-4O
speaker in Monitor Output Jack.
2. Check all tubes and voltages indicated on
schematic diagram.
3. Connectanaudiogenerator to thegrid ofeach
stage to locate the area of fault.
Dead Playbaclg Appears To Operate Properly
ln Record, Level lndicators Operating
1. First half of 12AX? (V1A) defective, (R11)
open, or defective function switch contacts.
2. Check Monitor Output Jack. Check short in
input grid shield wiring. Check for defective head.
Weak 0r Distorted Record, Playback 0n Pre-
Recorded Tape 0.K.
1. Check bias-erase oscillator coil (L2) second-
ary for 80V @ ?0KC.
2. Check input jack. Normal speech 1 ft. from
microphone should flash the "Normal" indicator.
3. Check microphone or other input source,
Microphone must have 3-circuitplug with shielded wire
connected to ring, and shield to body; tip is not con-
nected. One-volt input sources must have 2-circuit
plug. Failure to push plug firmly all the way into jack
will cause distortion.
4. Check bias-erase indicator lamp (M8). Lamp
should light if oscillator is properly functioning.
Recording Level lndicators lnoperative,
Records And Plays Properly
1. If indicators (M6) and (M?) are dead, lamps
may be loose, or (C22), (C23), (R35) or (R3?) open.
2. If lamp or lamps always glow, C22 and C23
may be shorted, R36 open, or amplifier may be oscilla-
ting.
=
On
H?
- lll
'lt
r{ ttt
o
I
rrt
n
@
Page ll

SOlenOid DOeS NOt ACtUate PfeSSUfe ROllef 2. Moverecorder awayfrom hum fields such as
(44) ln ttPlay'' 0f trReCOfdtr fluorescent lamps, amplifiersl etc.
t. rf usingremotecontrols,checkremoteswitch Microphonic Howl lnttPlaytt, But Dies Out
and cabte conttections. When Volume ls Lowered
1. Try different 12AX?'s in preramplifier stages.
2. Check on-off-switch (M11) and fuse (M10).
B. check ,,stop,,key microswitch. No Erasg Records Over Previous Recordings
4. Check fiber arm on ,,stop,, key blade of push -,^^,,1' Check for dirt on erase head element and
check pressure pads.
Dutton swrrcn - z. check bias-erase oscillator coil (L2) second-
5' Check mechanical linkage for binding' aryrorgov@ ?oKc. check oroct(v5)biasoscillator.
6. check solenoid' 3. check erase coil for open or short.
Records-Background Hum, Hum Lower 0n
Pre-Recorded Tape F[t TV 0r Amateur lnterference
1. Checkallstagesafterthefirstand6K6GT,(V5) Thisis heard as a raspy.unsteady buzz orcross
forcathode toheater leakage,also check(Cl) and(C2). modulation by voice o" *uJi". eal ""fOXO i7i*"tt
2' Record fromanother microphone etc',to see ly between tube socket gridlerminals and other input
whether hum comes from an outside gource. components.
3. Adjust "Record Humt' control (R2) {or mini- NO SOUnd, l,,leOn LampS FlaShing With Signal
mum hum with t'Stop" and "Speaker" keys down.
Hum ln Playbaclg FallS Off With Decrease ln 1. Check speaker switch.
Volume Control 2. Check transformer (T2) secondary for open.
1. Check first stage of 12AX7 (VlA). Adjust
'rPlay Hum'control (R3) for minimum hum. 3. Check connecting cables, jacks, plugs, etc.
AUXILIARY PARTS LIST
A173-5 Microphone PIug
4196-10 Hi-Fi Connecting Cable
A196-8 Attachment Cord Assembly
8195-4 Power Cord Assembly
TRA-1102 Accessory Adapter Cord
A195-3 Hand Switch Cord
TR-2601 Replacement hessure pads
Figu re 7. Bottom Vlew 0f Amplifier.
Page 12

ELECTRICAL PARTS LIST
Ref.
No. Part
No. Description
c3
c4
c5
c6
c7
c8
c9
c10
cu
c12
cl3
c14
c15
c16
vr
v2
v3
Y4
v5
v6
clA
B
c
D
c2A
B
c
c1?
cr8
c19
c20
c2l
c22
c23
c24
c25
c26
c27
c28
c29
c30
c31
c32
c33
c34
c35
c36
RiA
B
R2
R3
R4
R5
RO
R7
8120-3
8120-3
Bl20-r?
B120-r
8120-5
8120-2
Al19-4
A1l9-l
4'116-3
A116-3
A1r8-2
B1l5-1
Bll2-6
B1l3-10
8113-9
BU2-3
Bl14-rl
Blt4-2
8112-?
Bll3-8
BU4-3
BllS-2
B1r5-4
Blr3-8
Bl13-4
811{-2
Bil2-4
B1r5-3
BU4-1r
8114-1r
8112-5
BU3-r
B1r1-2
Blr4-1
Bll3-2
BllS-2
Br12-6
Bl15-l
B1l5-2
BllS-8
Bl15-3
8110-1
8140-9
A140-?
A140-?
Br05-l
Bl03-5
Bl05-1
8103-5
l2AX7, Pre-Amplifier
lzAX?, AF Amplifier
64U6, AF Amplifier
6V6GT, Audio Output
6KOGT, Bias Oscillator
6X5GT, Rectifier
Cap., Elect. , 30 Mfd. @ 450V.
Cap., Elect., 30 Mfd. @ 450V.
Cap., Elect., 35 Mfd. €)400V.
Cap. , Elect., 100 Mfd. @ 25V.
Cap. , Elect., 30 Mfd. @ 300V.
Cap., Elect., 15 Mfd. @ 350V.
cap. , Elect., ,10 Mfd. @ 350V.
Cap. , Elect. , 100 Mfd. @ 6V.
Cap. , Elect. , 100 l[fd. @ 6V.
Cap., Elect., 5 Mfd. €) 300V.
Cap., Molded Tub., .l Mfd.
@ 200v.
Cap., Ceramic Tub., 680 Mmf.
Cap., Ceramic Disc, 1500 Mmf.
Cap., Ceramic Disc, 3300 Mmf.
Cap. , Ceramic Tub., 220 Mmf.
Cap., Ceramic Disc, 50,000 Mmf.
Cap., Ceramic Disc, 15,000 Mmf.
Cap., Ceramic Disc, ?50 Mmf.
Cap., Ceramic Disc, 5000 Mmf.
Cap. , Molded Tub. , .022 Mfd.
@ 6oov"
Cap. , Llolded Tub., .l Mfd.
@ 600v.
Cap. , Molded Tub., .4? Mfd.
@ 600v.
Cap., Ceramic Disc, 5000 Mmf.
Cap., Ceramic Disc, 3000 MmI.
Cap., Ceramic Disc, 15,000 MmI.
Cap., Ceramic Dlsc, 300 Mmf.
Cap. , Molded Tub., .22 Mfd.
@ 400v.
Cap. , Ceramic Disc, 50r 000 MMf.
Cap. , Ceramic Disc, 50,000 Mmf.
Cap., Ceramic Tub., 4?0 Mmf.
Cap., Ceramic Tub., 1000 Mmf.
Cap., Ceramie Diec, 4? }Imf.
Cap., Ceramic Disc, 10,000 Mmf.
Cap., Mica, 2000 I'lmf.
Cap., Mica, 2000 Mmf.
Cap., Ceramic Tub,, 680 Mmf.
Cap., Molded Tub. , .l l[fd"
@)zoov.
Cap. , Motded Tub. , .l Mfd.
@ 600v.
Cap., Ceramic Disc, 5000 Mmf"
Cap. , Molded Tub. , .22 Mfd.
@)4oov.
Cap. , Ceramic Tub. , .4? lf,mf.
Volume Control, 2 Meg.
ToneControl ,2Meg"
Record Hum Control, l00O
Play Eum Control, l00O
Resistor, I Meg., VZWertt
Resistor, l8l$r, 1rl2 Wett
Reslstor, l Meg. , L/2Wa;tt
Reeistor, 18KO. 1,/2 Watt
Ref.
No. Part
No. Description
R8
R9
nl0
R11
Rl2
Rl3
Rt4
Rl5
Rl6
RI?
Rl8
Rl9
R20
R2l
R,22
R23
R24
R25
R26
R27
R28
R29
R30
R31
R32
R33
R34
R35
R36
R37
R38
R39
R40
R41
R42
R43
R44
R45
R46
R47
R48
R49
R50
R5r
R52
R53
R54
T1
T2
L1
L2
Ml
M:I
M3
M4
M5
M6
M?
M8
M9
rn0
Mtl
8105-1
Br02-5
8105-5
Bl04-8
Bl04-u
8104-11
8104-6
Br03-15
8105-r
8102-l
Br03-4
Br03-14
Bi03-4
8103-15
Bt03-7
Bl05-l
Br03-14
Bl02-1
8104-14
Bl04-t8
Br01-8
Br04-r5
8104-16
8104-1?
8104-8
A106-8
8104-U
Br04-14
8104-18
Bl04-14
Br04-5
B105-3
Bi04-16
BIO4-?
Br04-4
8104-14
Bl03-1
8100-2
8100-4
Bt04-5
8103-9
Br03-3
A106-9
A106-9
Bl00-r
8100-1
8102-3
8130-3
A131-4
A-133-5
A-132-2
Ar?3-5
A1?4-5
Br41-3
A1?4-14
Ar?4-14
ALzt-2
A12l-2
A121-4
Al2l-r
A1?6-3
Al4t-13
Resistor
Resistor
Resistor
Besistor
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Resietor
Resistor
Resistor
Besistor
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Resietor
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Registor
Resigtor
Resistor
Resistor
Resistor
Resistor
Resistor,
Resistor,
Resistor,
Resistor,
Reeistor,
Reeistor,
Power Tr
Output T:
Iligh Fre
Osclllato
Mike, Ra
Ihner, P
Function
Monitor I
Pre-Amp
Normal I:
Distort Ir
Record B
Pilot Ltgl
Fuse, 2 I
On-Off Sr
, I Meg., L/2Watt
, 2700Q, l/2Wztt
, 10 Meg. , L/ 2 Watt
, 4?0Ko, t/ 2 watt
, 560KO, VZWatt
, 560KO, L/2Watt
, 220KO, I Watt
, 82KQ, l/2Watt
, I Meg. , L/?Watt
, 1000Q, l/ 2 Watt
, l5KO, I/ZWatt
, 33KO, I/ 2 Watt
, l5IK}, L/ZWatt
, 82KO, l/ 2 Watt
, 22KO, I/ 2 Watt
,1Meg.,L/2watt
, 33KO, L/2watt
, 1000Q, l/ZWatt
, l00Ko, L/ZWatt
, l00KO, l Watt
, 3900, L/2Watt
, 200KO, l/2Watt
, 270KSl, L/ 2 Watt
, 180KO, l/2Watt
, 4?0Ko, t/ 2 watt
, 3300, 3.Watt
, 560KO, L/ 2 Watt
, I00KQ, vz'Watt
, 100KQ, l qtatt
, 100IKr, /2 Watt
, 220KO, L/2Watt
,4.7Meg.,VZWNtt
, 2?0l(fl, l/ZWatt
, 390Ktr,, L/2watt
, l50KQ, L/ 2 Watt
, 100l(f,r, vzwatt
, l0l(f,r, L/ 2 Watt
, loQ, I Watt
, 4?O, l Watt
, 220KO, L/ 2 Watt
, ,{?KQ, t/ 2 wa.;tt
, lol(f,|, 2 Watt
650Q, 5 Watt
650f}, 5 Watt
4. ?Q, V 2 Watt W. W.
4.1Q, VZ Watt W.W.
12000, 1rl2 Watt
:ensformer, U5 Volts
:angformer
q. Equalization AdJ. Coil
r Coil
dio, Phono Input Jack
hono Input Jack
Switch
lmp. Output Jack
. Output Jack
rdicator, Neon #NE-46
rdicator, Neon *NE-,15
lae Ind., Neon INE-51
rt, Type f4?
rmp. Slo-Blo
ritch
=
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HT
- lll 'lt
-l |lt
-
ts
E
lrt
v
e
Page 13

6V6GT 6K&GT
6AU6 IzAXT
T?AXr
6X5GT
Figure 8. Top View 0f Amplitier Showi ng Resistor Locations.
Page 14
Figure 9. Top View 0f Amplifier Showing Gapacitors, Coils, &Miscellaneous Parts.

<'\ 6 (:) 3 3
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Fig u re 10 . Schematic D iag ram .
Page 15

MECHANICAL PARTS LIST
c
c
L
c
f
L
Ref.
No. Part No. Descrlptlon
I
2
3
4
5
6
7
8
9
l0
l1
L2
l3
l4
15
r6
l?
l8
19
20
2I
22
23
24
25
26
21
28
29
30
3r
32
33
34
35
36
37
38
39
40
4l
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
5?
58
59
60
61
62
81-12306
Ar-12295
A4-t2267
LLl-12272
L4-L221L
TR-?260
Rl-140?8
TR-?251
A-18?-9
TR-2694
TR-?006
A3-14069
Al5-14008
TR-?002
TR-?00r
A14-12636
TR-?622
A9 -1263?
A9 -12 103
TR-?502
A9-10960
TR-?150
TR-?425
TR-7249
c-16r-1
TR-7429
TR-?520
TR-?916
TR-?6r5
TR-?915
TR-76r0
TR-?909
A13-r4090
TR-?445
A4-LL229
Br-14533
c9-14084
A30-14542
TR-?523
A3-14575
TR-752r
TR-?5I?
TR-?60r
TR-792r
TR-?445
Al3-11203
TR-?26?
B1-1452?
TR-7526
TR-7239
TR-7937
TR-7938
TR-?939
TR-?940
TR-7420
A9-11888
A9 -10960
TR-?605
A1-14510
Al-12424
TR-2629
,TR-7524
N.A. R. T. B. Reel Hub Adaptor
Reel Lock Assembly
Screw
Reel Lock Spring
Reel Lock
Spindle Screw
Top Plate Assembly
Pan Eead Screw, #6-32x7/32
Bias Indicator Jewel
Pilot Lamp Jewel
High Speed Knob
Tape Tension Arm
Head Cover, Rear
Eead Cleaning Cover
Top Plastic'Cover
#6-32 Screw
Spring
Hex. Nut
Roll Pin, 3/ 32 x L 3/ 8"
Flat Washer
Speed Nut
Head Spring Retainer
#4-40 Screw (Bind. Head)
Head Spring Insulating Stud
Play-Record-Erase llead
Head Alignment Screw
"E" Ring
Erase Pressure Pad Assembly
Erase Pad Spring
Record Pressure Pad Assembly
Record Pad Spring
Upper Mechanism Plate Sub-
Assembly
Instant Stop Spring
#8-32 Screw (Truss llead)
Spacer
Instant Stop Arm Assembly
Counter
Counter Drive Belt
"E" Ring
Spring Arm
"E" Ring
Washer
Pressure Roller Spring
Pressure Roller
#8-32 Screw (Truss Head)
Pressure Roller Arm Spring
Instant Stop Arm Bushing
Iligh Speed Slide Assembly
Grip Ring, 3/16" Shaft
Key Shaft
Stop Key Assembly
Play Key Assembly
Speaker Key Assembly
Record Key Assembly
Stop Key Adjusting Screw
"E" Ring, 3/16" Shaft
Speed Nut
Idler Drive Spring
Flywheel ldler Slide
Flywheel Drive Idler
Washer, Blued
rE" Ring, v4" Shaft
Ref.
No. Part
No. Description
63
64
65
66
6?
68
69
?0
?l
72
?3
74
75
?6
17
?8
79
80
81
82
83
84
85
86
8?
88
89
90
91
92
93
94
95
96
97
98
99
100
r0r
102
103
104
105
106
10?
r08
109
u0
lll
112
113
114
115
ll6
ll?
118
119
120
12r
122
A13-14048
A9-14141
A1-145u
Ar-14521
TR-2629
TR-?524
A8-14004
A8-14025
LL-L2423
TR-?809
413-14111
A9-123r5
Al3-14076
Al-14095
Al5-14089
Ar3-140?7
A9-r23r5
A1-14046
Al5-14089
At3-140??
A4-t4014
TR-?513
A3-r4r34
TR-?522
TR-?504
A1 -14516
A30-122?0
TR-?817
TR-7U0
TR-?504
TR-?6I?
TR-7r09
TR-?520
A9-14539
At-14541
TR-7504
TR-?504
TR-?526
TR-?514
TR-?u5
A9-11888
TR-?60?
TR-7912
TR-?604
TR-7522
TR-?504
81-12299
A30-12270
A1-14548
TR-?504
TR-?504
TR-?526
Br-14530
TR-?9u
A4-12286
TR-7r27
c9-140?1
TR.?15?
TR-79r0
TR-7803
Rapid Forward Idler Spring
Speed Nut
Idler Sllde Group, Rapid
Forward
Rapid Forward Idler Assy.
Washer, Blued
"E" Ring, v4" Shaft
Flywheel Thrust Washer
Spring Washer
Flywheel Assembly
Take-Up Belt
Brake Arm Spring
Grip Ring
Brake Eold Lever Spring
Left Brake Arm Assembly
Nylon Brake Roller
Brake Roller Leaf Spring
Grip Ring
Right Brale Arm Assembly
Nylon Brake Roller
Brake Roller Leaf Spring
Brake Arm Spacer
Flat Washer
Rear Slide Cam
Crescent Retalning Ring
Pheonol Washer
High Speed Forward Cup Assry.
Take Up Spindle Drive Belt
Take Up Clutch Felt
Clutch Plate
Pheonol Washer
Clutch Plate Spring
Take Up C1utch Pulley
"E" Ring, v 8" Shaft
Take Up Pulley Felt Washer
Take Up Pulley &Shaft Ass'y.
Pheonol Washer
Pheonol Washer
Grip Ring, 3/16" Shaft
Flat Washer, Steel
Take Up Clutch Lever
"E" Ring, 3/16" Shaft
Spring
Toggle Arm Assembly
Rewind Arm Spring
Crescent Retaining Ring
Fiber Washer
Intermediate Pulley Ass'y.
Rewind
Rubber Drive Belt
Rewind Pulley & Shaft Assry.
Pheonol Washer
Pheonol Washer
Grip Ring, 3/16" Shaft
Rewind Support Arm Ass'y.
Solenoid Arm Assembly
Motor Pulley
Slide Cam Connector Arm
Motor, ll5 Volt, 60 Cycle
Motor Fan
Solenoid Bracket Ass'y.
Solenoid (105-120 Volt)