Elekit TU-875 Installation guide
Hybrid Stereo Pre-amplifier
Content
Cautions
Necessary Tools
1.Parts List
2.Circuit board assembly
3.Wiring, assembly, operation check,
and usage
4.Technical Data
5.Warranty
875-06
Long Nose Pliers
Solder
(0.8~1.0mm)
Soldering iron(15~30W) Diagonal-Cutter
Screwdriver
(No.2)
Solder Stand
Pen KnifeScissors Hexagonal wrench (1.5mmE2.5mm) Multimeter
NECESSARY TOOLS
1
CAUTIONS For your own safety, please read the "Assembly Instruction Manual" carefully
before you begin assembing this preamp kit.
Please follow the instruction step by step for correct assembly.
Do notwork near anysource of water or allow anycomponents to getwetwhich maycause fire andelectric shock.
Do not put containers with w ater on the work table such as v ases, cups, cosmetics, and drugs. Spilling water on components
will cause fire and electric shock.
Keep outof reach of small children during assembly,usage andstorage. Please discard packing waste andanywaste from
assembling the kit according to social standard for safety and protection of the en viroment.
Read the "Assembly Instruction Manual" carefully and be sure to f ully understand the instructions bef ore assembling.
Be careful when handling tools; diagonal cut ters, pen knives, and other sharp tools in particular.
Do not work near young children due to safety concerns. Children must not play with tools, plastic bags and electronic parts as they
may cause harm.
Some essential pieces in this kit include small and sharp objects that are made of glass or metal. Be extremely careful. If by
any chance a child has swallowed any of these items, immediately consult a medical doctor.
This product and its components may differ without notice.
ƒPlease keep this instruction manual handy at all times.
Lot.No.
EK JAPAN 1999
2-19-30, Tofuro-Minami, DazaifuCity, Fukuoka, 818-0105, Japan
EK JAPAN's homepage: www.elekit.co.jp
TU - 875 Assembly Instruction Manual
1
1
2
3
6
14
16
Features
This is a simple preamplifier without tone control. The pre- amplifier has a volume and
balance control, a phono equalizer and a MC head amp. It is also compatible with /
a MM/MC cartridge.
A hybrid construction using J-FETwith a MChead ampandequalizer to give a low
noise effect without compensating thequalityof music produced by thetubes.
An AC adapter (DC7V stabilized power outlet) is separate andis used as a power
supply.A secondary power for thevacuum tubes is supplied by a steady DC 200V
from theDC-DC converter of a sealed box. With themain body andpower supply
separated, the electromagnetic hum-noise is reduced.
Thepopnoise muting circuit uses a relaymethod rather than an analog switch to
prev ent sudden large amplitude response of the tubes. The LED light, which indicates
power input, will blink from power on to muting cancellation.
LINE-1 and LINE-2 are compatible with monophonic sources. When plugged into the
L-side alone, the R-side will be automatically turned on.
A printed circuit board is included f or easy assembly.
EK JAPAN CO. , LTD.
has a volume and
com
p
atible with
/
lizer to
g
ive a lo
w
c
ed by thetubes.
s
use
d
as a
p
owe
r
a
stead
y
DC 200V
and
p
ower su
pp
l
y
n
analo
g
switch t
o
h
t, which indicates
n
p
l
u
gg
e
d
into t
he
www.cnamusic.com
A1015(A733)
C2120(C2001)
K170
B
B
C
E
E
-
74HC04 74HC4017
#
*5 FET S
S
G
D
D
10m m
2*101)0&2. Circuit Board Assembly
* The double-sided circuit bard is a through-hole circuit board. be very careful when assembling the parts and make sure
they are in the cirrect marked position. Once a component has been soldered, it is very difficult to remove. If it is
necessary to remove a soldered component, be sure to use a solder wick or a solder sucker.
A. Circuit Board Assembly * The side with white printing faces upwards. The soldered side faces downwards.
Diode
15 (Brown Green Black Gold) R81, 82
220 (Red Red Brown Gold) R1, 2, 7, 8, 66
1k (brown Black Red Gold) R57, 58, 59, 60, 61, 62,
67, 68, 69, 70, 75
2.2k (Red Red Red gold) R63
3k (Orange Black Red Gold) R11, 12, 65
6.8k (Blue Gray Red Gold) R9, 10, 76
22k (Red Red Orange Gold) R15, 16
33k (Orange Orange Orange Gold) R79
68k (Blue Gray Orange Gold) R64, 71, 77, 78
120k (Brown Red Yellow Gold) R3, 4, 5, 6, 73
200k (Red Black Yellow Gold) R13, 14, 17, 18, 41, 42, 72
680k (Blue Gray Yellow Gold) R74
0.47 (1W/R47) R83
Diode (small) Red with a white line D1-8 *1
IC 74HC04 IC1 *2
74HC4017 IC2
Push lock switch SW1 *3
Base pin Marked as on PCB +7V, GND, B+(HV-IN)
(3 locations)
Transistor A1015 (or A733) TR7 *4
C2120 (or C2001) TR2-6
FET K170 FET1,2 *5
Film capacitor 0.68 F(684) C5,6
Myler capacitor 0.1 F(104) C34, 35, 36
Nonpolar electrolytic capacitor 10 F / 16V C38
Electrolytic capacitor 100 F / 16V C1, 2, 37 *6
33 F / 100V C3, 4, 7, 8
22 F / 350V C33
2200 F / 16V C39
Relay RY1-5
Tog gle switch SW2
GND bracket PHONO GND *7
Screw M3x8 (black) 2pcs
Tube
Shaft
DC Jack Jack4
4P RCA Jack Jack 1-3
Main chassis
1pc
Bottom panel
1pc
Transformer
cover
1pc
Front panel
1pc
Volume bracket
1pc
GND bracket
1pc
Knob 2pcs
(screws for knob
included)
Insulator
1pc
Tube
1pc
Vacuum tube 12AU7(5963/6189/ECC82) 3pcs
* Vacuum tubes are made of glass. Please handle with care.
*A metallic black haze visible in the inner wall of the glass indicates
it is a sealed vacuum tube. If this turns white, the vacuum has
leaked and can no longer be used.
* All vacuum tubes have been examined to ensure quality. Some may
have a minor scratch that does not affect the function of the tube.
AC adaptor
(7V 1.8A)
1pc
Vacuum tube socket
MT9P 3pcs
28 parallel jumper cable 1set
Base pin 6pcs
Diode
small 9pcs
large 1R5NU 2pcs
Relay 5pcs
Electrolytic capacitors
100 F / 16V 10pcs
33 F / 100V 6pcs
2200 F / 16V 3pcs
22 F / 350V 3pcs
3.3 F / 350V 1pc
10 F / 50V 2pcs
Potentiometer
(1 nut and washer per channel)
100k B with clicking function
(with indication of 104) 1pc
50k MN with switching function
(with indication of 503) 1pc
Transistor
A1015 (or A733) 1pc
C2120 (or C2001) 5pcs
C3425 1pc
DC Jack 1pc
Toggle switch 1pc
P Push lock switch 1pc
4P RCA pin jack 3pcs
IndicationIndication
Resistors (1/4W)
15 (Brown Green Black Gold) 2
220 (Red Red Brown Gold) 11
1k (brown Black Red Gold) 15
2.2k (Red Red Red gold) 5
3k (Orange Black Red Gold) 4
6.8k (Blue Gray Red Gold) 2
15k (Brown Green Orange Gold)
2
22k (Red Red Orange Gold) 2
33k (Orange Orange Orange Gold)
3
68k (Blue Gray Orange Gold) 13
120k (Brown Red Yellow Gold) 10
200k (Red Black Yellow Gold) 12
680k (Blue Gray Yellow Gold) 7
Resistors (1W)
0.47 (with indication of R47) 1
Function label 1pc
Felt 1pc
Transformer 1pc
Hook-up wire
Black 1pc Blue 1pc
Orange 1pc
Screws
M3x8 (black) 21pcs
M3x10 8pcs
Tapping screws
M3x8 3pcs
M3x8 Knurling Head screw 1pc
Hexagon socket head screw
M3x8 4pcs
Screw spacer
M3x15 6pcs
M3x20 2pcs
Shaft 1pc
Film capacitor
0.0022 F (with indication of 222) 4pcs
0.0068 F (with indication of 682) 8pcs
0.68 F (with indication of 684) 4pcs
0.47 F (with indication of 474) 6pcs
Myler capacitor
0.1 F 5pcs
Choke coil
(with indication of 045-100) 1pc
Nonpolar electrolytic capacitor
10 F / 16V 1pc
FET
K170 4pcs
Indication
Indication
Indication
IC
74HC04 1pc
74HC4017 1pc
PQ2CF1 1pc
LED 4pcs
Printed Circuit Board
TU-875R A 1pc
TU-875R B 1pc
TU-875R C.D 1pc
1. Part List * Please check off the box in front of each item to ensure they have been included in the kit.
* Warning! Electrolytic capacitor has a negative
end and positive end. It is dangerous if the
electrolytic capacitor is not installed properly.
Parts with polarity
*1 Diode (small)
The line is on the side of K.
*2 IC
Match the mark Match the mark
*3 Push lock switch
Switch side
Set it in the direction indicated
on the PCB and solder. Cut the
tube to 10mm and set to the
switch.
*4 Transistor
Indication
Indication
* Try to have the toggle switch /DC Jack / 4 pin RCA Jack
to sit straight when soldering.
*6 Electrolytic capacitor
The side with longer lead is positive.
The side with shorter lead is negative. * Place the capacitor vertically.
*7 GND bracket
Fix the bracket with black M3x8
screws on the marked position.
M3x8 (black)
Insert the shaft into the push lock switch.
GND brakcet
Shaft
Part List Value Part Number
15 (Brown Green Black Gold)
220 (Red Red Brown Gold)
1k (brown Black Red Gold)
2.2k (Red Red Red gold)
3k (Orange Black Red Gold)
6.8k (Blue Gray Red Gold)
22k (Red Red Orange Gold)
33k (Orange Orange Orange Gold)
68k (Blue Gray Orange Gold)
120k (Brown Red Yellow Gold)
200k (Red Black Yellow Gold)
680k (Blue Gray Yel low Gold)
0.47 (1W/R47)
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