tube preamp kit tu-8500 - kerlee.com · (15-30w) solder (for electronic parts) (diameter 0.8-1.2mm)...

Tube Preamp Kit TU-8500Assembly Instruction Manual

●ContentsCaution during assemblyNecessary tools1. Part list2. PCB assembly3. Body assembly

11238

11121213

14141416

8500-02

1

Lot.No.

This is a preamp kit with a phono equalizer. The features of this preamp include: - Uncompromising measures taken for reduction of power supply hum

and noise. A low leakage flux R-core transformer is used for the main power supply with a FET ripple filter and DC heater supply.

- 12AU7(ECC82) tubes mounted horizontally for slim profile. Switchable gain of 0dB and 10dB.

- Low noise OP amp has been selected for the equalizer amp stage. (IC socket offers easy exchange with other commercially available OP

amp ICs). - CR equalizer circuitry is used for its renowned sound quality. Supports both MM and MC phono cartridges. - The power transformer supports 4 different power/voltage

environments: 100V, 115V, 200V, and 230V. (Voltage is selected at assembly by matching the correct connector for voltage requirements).

CAUTION DURING ASSEMBLYFor your own safety, please read this “Assembly Instruction Manual” carefully before you begin assembling the preamplifier. Please follow the instructions step by step for correct assembly and operation. Keep this manual close to hand.

Hexagonal wrench(1.5mm)

8. Enjoy TU-8500 to the fullest 9. Why do vacuum tubes attract audiophiles?10. Technical data11. Warranty

4. Safety precautions and safety check before and after powering up the preamplifier5. Operation check6. Troubleshooting7. Connection

Necessary tools

Soldering iron(15-30W)

Solder (for electronic parts)(Diameter 0.8-1.2mm) Soldering iron stand Diagonal cutter

Long-nose pliers ScissorsPhilips screwdriver(No.2)

Helpful tools

Nut driver(5.5mm)

Tweezers(For labels) File or sand paper Scotch tape

MultimeterOptional voltage check and connection check is suggested. *Both analog and digital are OK.

◆Do not work near any source of water or allow any components to get wet which may cause machine failure, fire and electric shock. Also, do not put containers with water on the work table such as vases, cups, cosmetics and drugs. Spilling water on components may cause fire and electrical shock.

◆Be careful when handling tools, such as a soldering iron, diagonal cutter, pen knife, and other sharp tools in particular to prevent breakage and injury. Use a pair of gloves and protective glasses according to need.

◆Some essential pieces in this kit include small and sharp objects that are made of glass or metal. Be extremely careful when handling. ◆Please discard packing waste and any waste from assembling the kit according to local standards for safety and protection of the

environment. ◆Do not work, keep or place the product near young children due to safety concerns. Children must not play with tools, plastic bags,

and electronic parts as they may cause harm. In case a child swallows a part, immediately consut with a doctor.◆The specifications, forms and contents of this product are subject to change for improvement without prior notice.

EK JAPAN 2015 EK JAPAN CO.,LTD. Tofuro-minami 2-19-30, Dazaifu-shi, Fukuoka, 818-0105, Japan Phone: +81-92-923-8235

Website: http://www.elekit.co.jp E-mail: [email protected]

Electrolytic capacitor□ 10μF (200V) 4pcs□ 100μF (160V) 4pcs□ 220μF (25V) 5pcs□ 2200μF (25V) 2pcs□ 120μF 8pcs

* The getter, the metallic silver coating inside the tube, indicates it is a sealed vacuum tube. If this turns white, it means that the vacuum of the tube is broken and the tube can no longer be used.

* All vacuum tubes have been examined to ensure quality. Some may have a minor scratch, stain, or rust-like object that does not affect the function of the tube. Also,the shape, heater brightness, or the printing direction vary in each tube.

2

1. Part list * Please check off the box in front of each item to ensure they have been included with the kit. * There may be more screws and nuts than indicated. Keep them as spare parts.

□Knob 2pcs (A screw for knob included)

□Power transformer 1pc□PCB 1pc □Function label

(Silver) 1 sheet

□Insulator foot 4pcs□Vacuum tube 12AU7(ECC82) 2pcs

A screw for knob is included in the same plastic bag as the knob. Make sure to take it out from the plastic bag.

The pins may be bent, Adjust them to match PCB holes before mounting

□Spark killer　(RE1201)　1pc

Screw for knob

Film capacitor□ 0.022μF (printed 223) 3pcs□ 0.033μF (printed 333) 2pcs□ 0.1μF (printed 104) 2pcs□ 0.47μF (printed 474) 4pcs

□Zener diode (made of glass) 3pcs

□Bridge diode (printed ～,＋,and－) 6pcs

□FET 02N60Z 1pc

□LED 1pc

□Tube socket　(9-pin) 2pcs

□AC inlet 1pc

□Flange bushing 2pcs

□Ceramic coupling 2pcs

□Vinyl tube 1pc

Metal shaft□Long (φ6x150mm) 2pcs□Short (φ3x25mm) 2pcs

Connector□2-pin 2pcs□4-pin 1pc□7-pin 1pc

□AC power cord 1pc□Connector cable 1pc

□Midget fuse (0.5A 250V) 1pc□Fuse holder 2pcs

□Pin jack　(RCA jack) 　5pcs

□4-pole mini jack 1pc

□Relay 1pc

□Toggle switch（with a nut and a washer)　1pc

□Volume (50kΩA, Dual) 1pc(With a nut and a washer)

Binding screw□Small(M3x8) 23pcs□Large(M4x8) 4pcs

□Hex screw spacer 5pcs(Hex, M3x17 female-female)

□Rotary switch 1pc(With a nut and a washer)

□Push switch　2pcs

□Binding tapping screw (M3x10) 5pcs

□Finger screw　(M3x8) 1pc

□Nut (M3) 1pc

□Claw washer (M3) 7pcs

□PCB terminal 3pcs

□Masking felt　(Black) 1pc

□LED mask (Opaque white) 1pc

□PTC (Mustard) 1pc

□IC socket　(8-pin) 2pcs

IC□LM2940CT-12 1pc□LM2990T-12 1pc□2068DD 2pcs□40106B (or 4584B) 1pc□4040B 1pc

Cement resistor(5W)□15Ω (printed 15Ω or 150 or15R) 1pc

Metal-film resistor(1/4W)□ 100Ω (BRN-BLK-BLK-BLK-GLD) 6pcs□ 390Ω (ORN-WHT-BLK-BLK-BRN) 4pcs□ 3.3kΩ (ORN-ORN-BLK-BRN-BRN) 4pcs□ 10kΩ (BRN-BLK-BLK-RED-BRN) 5pcs□ 33kΩ (ORN-ORN-BLK-RED-BRN) 4pcs□100kΩ (BRN-BLK-BLK-ORN-BRN) 19pcs□470kΩ (YEL-VIO-BLK-ORN-BRN) 18pcs

Resistor(1/4W)□ 2.2Ω (RED-RED-GLD-GLD) 3pcs□ 3.3MΩ (ORN-ORN-GRN-GLD) 2pcs

* Top and bottom chassis and the front panel are temporarily fixed with screws.

□Front panel 1pc□Bottom chassis 1pc

□Top chassis 1pc

Some units may be alreadyseparated from the PCBat the perforated line.

□Warning label (yellow) 1pc

Resistor

(20V,Low-ESR)

Color indication

2. PCB assembly * Follow the instructions step by step. Check off the box after each component has been soldered.

Before soldering

UNIT-1 assembly

1 Resistor (1/4W) [Not orientation specific]

4-pole mini jack IC socket IC 2068DD IC 40106B, 　 4040B

Push switch

2

Bridge diode

4

Mark on PCB

Mark on PCB

8500-02

Mark on PCB

Mark on PCB

Mark on PCB

5

Marks of～,＋,－

Zener diode

Correct mounting

Mark on PCB

Mark on PCB

The side with a black line is K.

Made of glassKA

□ZD1 □ZD2 □ZD3

□D1□D2□D3

□IC1 2068DD□IC2 2068DD

□JACK5

Match the shapes.

□SW1□SW3

□IC1□IC2

①Before soldering, follow the cut lines (grooved lines) on the PCB to break it into 8 pieces. Use an edge of a desk to break the PCB easily. ②Use a sandpaper or file to make the broken surface smooth to avoid injury.

KA

In this kit, the components on the right and left channels are assigned even and odd numbers, respectively. For example, R1 and C1 are Left channel, and R2 and C2 are Right channel.Most of the components on UNIT-1 PCB are located symmetrically on the board for ease of locating and mounting the components upon assembly.

Tips

6 7 8

* There will be 5pcs of PCBs, UNIT1-5.

IMPORTANT!

Resistor (1/4W)

2.2Ω (RED-RED-GLD-GLD)□R59 □R60 □R66

3.3MΩ(ORN-ORN-GRN-GLD)□R55 □R62

Metal-film resistor(1/4W)

100Ω (BRN-BLK-BLK-BLK-BRN)□R5 □R6 □R25□R26 □R53 □R54

390Ω (ORN-WHT-BLK-BLK-BRN)□R7 □R8 □R21 □R22

10kΩ (BRN-BLK-BLK-RED-BRN)□R13 □R14 □R23□R24 □R58

470kΩ (YEL-VIO-BLK-ORN-BRN)□R27 □R28 □R29□R30 □R31 □R32□R33 □R34 □R35□R36 □R41 □R42□R51 □R52 □R56□R57 □R63 □R64

3.3kΩ (ORN-ORN-BLK-BRN-BRN)□R19 □R20

33kΩ (ORN-ORN-BLK-RED-BRN)□R15 □R16

100kΩ (BRN-BLK-BLK-ORN-BRN)□R1 □R2 □R3□R4 □R9 □R10□R11 □R12 □R17□R18 □R37 □R38□R43 □R44 □R45□R46 □R65

3

Check the indication and make sure the mounting orientation.

Here are the marks indicating the sides to mount parts and the mounting orientations.

No indication

[Not orientation specific]

Mount the part with this mark on SIDE-B. If this is not shown, mount the part on SIDE-A.

There is a polarity, such as + and -, and has a specific orientation for mounting. If mounted incorrectly, you may not achieve a proper operation or it can be hazardous for some parts.

There is a polarity, such as + and -, but as the shapes of the parts and the PCB do not allow the parts to be mounted incorrectly, there is no need to mention the polarity.

There is no polarity, such as + and -, and no specific orientation when mounting.

□D4□D5□D6

Set the mini jack so that the jack inlet faces outward, mount on SIDE-A, and solder on SIDE-A.Make sure the jack is fully seated against the PCB before soldering.

Insert from SIDE-B,solder from SIDE-A.

Insert the IC to the socketmounted in Step 6 .

Match the marks. Match the shapes.

□IC3 40106B　(or 4584B)□IC4 4040B

3

Indication by color

2pcs each of 3.3kΩ, 33kΩ, and100kΩ are to be used in a latersteps.

Correct mounting

Correct mounting

Correct mounting Correct mounting Correct mountingCorrect mounting

Correct mounting

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3.3kΩ (ORN-ORN-BLK-BRN-BRN)□R39 □R40

33 kΩ (ORN-ORN-BLK-RED-BRN)□R49 □R50

100kΩ (BRN-BLK-BLK-ORN-BRN)□R47 □R48

5

□JACK1□JACK2□JACK3□JACK4□JACK6

Mark on PCB

UNIT-1 assembly

2119 20

1

Cement resistor (5W) [Not direction specific]

Pin jack (RCA jack) FET 02N60Z

Mark on PCBHow to set

Mark on PCB How to set

How to install

How to set Mark on PCB How to set

22 IC LM2990T-12

□R61 15Ω(printed either 15Ω or 150or 15R)

Make sure the jack is fully seated and level on the PCB before soldering.

Trim the leads of JACK1 after soldering.

Make sure the socket is fully seated and level on the PCB before soldering.

□FET 02N60Z □IC6 LM2990T-12

□V1　□V2

□CN8 AC inlet

□SW4

G G-I -OD S

UNIT-2 assembly

Color indication

Metal-film resistor [Not direction specific]

4 5

2

How to set

Mark on PCB

How to set

How to setMark on PCB

Mark on PCB

Mark on PCB

PCB terminal 3

1

UNIT-4 assembly

2 3

Tube socket

□TM3





Electrolytic capacitor

LED Connector 2-pin Toggle switch

AC inlet installation

The side with longer leg is +.

The side with longer leg is A.

Indication

The side with a mark is -.

120μF(20V)□C13 □C14

□LED

□CN7 2-pin

10μF(200V)□C17 □C18

①Fix 2pcs of hex spacer to the PCB SIDE-B with 2pcs of binding screw small.

②Set AC inlet and temporarily fix it with 2pcs of binding screw small.

③Solder the terminals of AC inlet at 3 locations, on PCB SIDE-A.

④Remove the screws used for temporary fixation in Step ②

AC inlet

Hex spacer(2pcs)

Binding screwsmall (2pcs)

Binding screw small(2pcs)…For temporary fixation

PCB(SIDE-B)

Temporaryfixation

Make sure the switch is set closely and horizontally to the PCB upon soldering.

Tilt for 30-45 degree, not 90 degree.

* The pins may be bent. Adjust them with long-nose pliers to match PCB holes before mounting.

Solder the fixing pin as well.

The nut and washerwill be used in a later step.

8500-02

Set the LED at the right angle first, and solder. Then bend the leads as shown on the right.

6

●Complete PCB * Compare your PCB with the PCB image below. Check for any unsoldered leads or pins, or any components with insufficient solder, bridged solder joints between leads/pins or components, and components that may not be fully seated on the PCB.

Check the setting directions of the parts, especially electrolytic capacitors, diodes, IC, FET, etc.

R59

2.2Ω

R60

2.2Ω

R66

2.2Ω

RED-RED-GLD-GLD

R62 3.3MΩORN-ORN-GRN-GLD

R5 1

00Ω

R6 1

00Ω

R25

100Ω

R26

100Ω

R53 100Ω R54 100Ω

R7 3

90Ω

R8 3

90Ω

R21

390Ω

R22

390Ω

R13

10kΩ

R14

10kΩ

R23

10kΩ

R24

10kΩ

R56 470kΩR58 10kΩ

R27 470kΩ R28 470kΩ

R29 470kΩ

R30 470kΩ R32 470kΩ

R34 470kΩ R33 470kΩR31 470kΩ

R35

470k

Ω

R36

470k

Ω

R41

470k

Ω

R42

470k

Ω

R51 470kΩ R52 470kΩ

R55 3.3MΩ

R57

470k

Ω

R63

470k

Ω

R64

470k

Ω

R19

3.3kΩ

R20

3.3kΩ

R15

33kΩ

R16

33kΩ

R1 1

00kΩ

R2 1

00kΩ

R3 1

00kΩ

R4 1

00kΩ

R9 1

00kΩ

R10

100k

Ω

R11

100k

Ω

R12

100k

Ω

R17

100k

Ω

R18

100k

Ω

R37

100k

Ω

R38

100k

Ω

R43

100k

Ω

R44

100k

Ω

R45

100k

Ω

R46

100k

Ω

R65 100kΩ

ZD1A K

ZD2

AK

ZD3

AK

D1D2 D3

D4

D5D6

SW1(SIDE-B)

IC1

IC2

2068

DD

2068

DD

IC3 40106B

IC4 4040B

（ or 4584B)

SW3(SIDE-B)

IC5LM2940CT

-12

FUSE

0.5

A

CN1

CN6

CN2 (100V)

CN3 (115V)

CN4 (200V)

CN5 (230V)

V1 V2

R39 3.3kΩ R40 3.3kΩR49 33kΩ R50 33kΩ

R47

100k

Ω

R48

100k

Ω

TM1

TM2(SIDE-B)

JACK5

C25220μF

C26 220μF

C24 220μF

C23 220μF

R61 15Ω

C22 220μF

C28 2200μF

C272200μF

C29 100μF

C30 100μF

C32 100μF

C31 100μF

C33 10μFC34 10μF

C17 10μF

C18 10μF

C14 120μF

C13 120μF

C10

C9 120μF

C1 C2 C8 C7 120μF 120μF 120μF 120μF

C110.47μF(474)

C120.47μF(474)

C150.47μF(474)

C160.47μF(474)

C50.1μF(104)

C60.1μF(104)

C30.033μF

(333)

C40.033μF

(333)

C19

C20

C210.022μF(223)

RY

IC6

FET02N60Z

C35

Spar

k ki

ller

(RE1

201)

LED

AK

CN7

SW4

PTC

VR SW2

BRN-BLK-BLK-ORN-BRN

YEL-VIO-BLK-ORN-BRN

ORN-ORN-GRN-GLD

BRN-BLK-BLK-RED-BRN YEL-VIO-BLK-ORN-BRN

YEL-

VIO-

BLK-

ORN-

BRN

YEL-VIO-BLK-ORN-BRNBR

N-BL

K-BL

K-BL

K-BR

N

ORN-WHT-BLK-BLK-BRN

ORN-ORN-BLK-BRN-BRNBRN-BLK-BLK-ORN-BRN

ORN-

ORN-

BLK-

RED-

BRN

BRN-BLK-BLK-ORN-BRN

ORN-WHT-BLK-BLK-BRNBRN-BLK-BLK-BLK-BRN

YEL-VIO-BLK-ORN-BRN

BRN-BLK-BLK-BLK-BRN

BRN-BLK-BLK-ORN-BRNBRN-BLK-BLK-ORN-BRN

YEL-

VIO

-BLK

-ORN

-BRN

YEL-

VIO

-BLK

-ORN

-BRN

YEL-VIO-BLK-ORN-BRN

UNIT-5

BRN-BLK-BLK-ORN-BRN

ORN-ORN-BLK-RED-BRN

ORN-ORN-BLK-BRN-BRN

JACK1JACK2 JACK3 JACK4JACK6

TM3

CN8 AC inlet(SIDE-B)

LM2990T-12

UNIT-2

UNIT-1

UNIT-4

* This is when the product is used in 100V environment. The connector should be set to either CN2,CN3, CN4, or CN5 depending on your voltage environment.

120μF

BRN-BLK-BLK-ORN-BRN

ORN-ORN-BLK-BRN-BRN

ORN-WHT-BLK-BLK-BRN

BRN-BLK-BLK-BLK-BRNORN-WHT-BLK-BLK-BRN

BRN-BLK-BLK-RED-BRNBRN-BLK-BLK-RED-BRN

BRN-

BLK-

BLK-

BLK-

BRN

ORN-

ORN-

BLK-

RED-

BRN

BRN-BLK-BLK-RED-BRN

BRN-BLK-BLK-RED-BRN

7

● UNIT-2 and 3 installation to UNIT-1

UNIT-2

UNIT-1

UNIT-3

Binding screw small

After checking the parts setting and soldering condition on Page 6, install UNIT-2 and UNIT-3 to UNIT-1.

①Install UNIT-2 and UNIT-3 to UNIT-1 as shown below.

②Solder these terminals A-S, 19 locations, of these 3 units.

Before soldering

After soldering

Melt an adequate amount of solder for a strong joint. If the solder amount is not enough, the terminals may not be connected properly.

Now all the parts are soldered. Let’s go on to the chassis assembly.

●PCB pattern * Please refer to the diagram below and check the PCB condition.

SIDE-A

SIDE-B

8500-02

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& ' � � � � � � � � � � � � � � � ' � � � � � � � " & ' � � � � � � � � ! ' � � � � � � � � � � � "

& ' � � � � � ( ) & * + , "

- . / / 0 1 2 3 4 5 6 / . 7 1 3 4 / 8 9 : 3 1 ; 1 < => ? : : @ 8 A = B ; C 3 4 6 1 4 D / 0 E F 4 G H 8 . / 8 I 9 F @ 1 . < 1 G = J K 1 A < : F ; 1 @9 : ; <- 6 F L L F < 0 1 @9 : ;

9

6 7

8

10 11

9

Install UNIT-4.

Install flange bushings.

Nut (Thread till end of the shaft)

This washer is not used.

Claw washer

Nut

UNIT-4

Binding screw small3pcs

7-pin connector

4-pin connector

Connector cable

Push hard into the square holes.

Flange bushing2pcs

Metal shaft Long2pcs

Ceramic coupling 2pcs

Install metal shafts.

Install knobs.

Knob 2pcs

Screw for knob

Install vacuum tubes to the socket.

Vacuum tube12AU7

Remove the nut and washer from the toggle switch. Install Unit-4 to the bottom chassis. Thread the remaining nut on the toggle switch from the front.

Fix UNIT-1 and UNIT-4 with binding screw small.

Install the cables with connectors as shown.

Push the cables with connectors into their sockets between the transformer and UNIT-1.

Set ceramic couplings to the shafts of the volume and the rotary switch.

Insert the metal shafts into the ceramic coupling. Once fully seated, back the shaft out approx. 1mm from the coupling and tighten the set screws.

Leaving 1-2mm clearance between the knob and chassis, fix the knobs with attached screws to each shaft.

Align the knobs to the indicators on the chassis.

Check if the pins are correctly aligned to the socket.

Push in the white disk part of the ceramic coupling to the position indicated on the PCB and fix with the screws.

8500-02

There must be a clearance between the shaft and the flange bushings in order for the shaft to rotate smoothly. However, due to this allowance the shaft may not sit firmly in the bushing. Adding a small amount of grease between the bushing and shaft is recommended. Select a high viscosity grease (Catagory 3 or higher) for best results. Mixing baby powder at a 1:1 ratio with a lower viscosity grease (below Catagory 3) can be substituted if needed.

� �

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# � $ � � � � � � � � � ! % � � � � � � � % � "� � & ' � � � � � � ( � "

) � ( * � ( + � � � � % � ! � ' ' & � � �, ' � % % � � � � � & � � �- . � ( � � / � � + � � 0

) � ( * � ( + � � � � % � ! � ' '& � � �

1 � � � � � � � � � � � � � � � 2 3 � � � � � �4 � � 5 � ( + / � ' �

6 7 . ! � � 58 9 9 : ; < 9 < = > ? @ A : B CD E 9 < = F : ; C B G H = D I 9 < =I J D E 9 K : E = L M G 9 < = G 9 < = JN O E ; 9 G D E > : F = L P D JQ ; D 9 ; < 9 : K = D J: H < = B G R = S # � � ( � � � ( � ' ) � ( * � ( + � � � � % � ! � ' 'T � � �U V � � W � � � X Y Z [

X \ ] ] \ ^ Z _ Y ` ` a ` b \ c Z _ Y ` ` a `d

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- j � ' � � � � ( � � � � � � � � � � � ' � � ' / � � ! # k l � �# k m � � � � � * � ( + � � � � � � � ' � � + � � � � � � ( + n � �� ' � � � � * � ( o p q 1 k r � � � � ! ' n "l s s tl l s k l & s t& s s t& & s k & m s t k u # k lk u # k &k u # k Tk u # k mv � � ( � ( + ' � � ' w x � ' ' � % y4 � 5 � � � � � � � � � � � � � � � � �% � � ( � ( + ' � � ' � � � � � � * � � � � * � ( � "

- 1 � � � � � � � ( � $ � � � ' � � ' / � � � � � � " � ' � � � � � � � � � � ! � � � � � � � � "

b a c `, � � � � � � ' � � ' % � � �� / � � � � � � � � "� � � ' � � ! � ' ' � � � � � � (� / � � � ' � � ' � � 5 � ( +� / / � ( * � � � % � � �� ! � ' ' � � � � � � ( � / � � �' � � ' � * � � � � � � � � 5� � � $ � � � � * "� ' � � � � � � ' � � ' � (� � � * � � � � � * ' � � � � � � (� ( * � � � � � � � � % � �� $ � � � � *� * � � � � � � "z ( � � � � � ' � � ' � � � (� � � � � � � � � � � � � �' � � � � � � ( { � ' � % ' n� � ! � � � � � � � � � � � /� � � ' � � ' � � 5 � ( + � �� $ � � � � � � � � � � � � /� � � � * � � � � � � "

11

8500-02

CAUTION

4. Safety precautions and safety check before and after powering up the preamplifier (Be sure to read for safety use)

Incorrect use or handling of the product may cause electric shock, bodily harm, and damage to the product and other connected components. Please read the cautions below to avoid accidents.

◆Before closing the chassis after assembly or repair, make sure to verify that all the parts are installed correctly, there are no

mistakes in wiring and soldering before turning ON the power.

◆Electronic components in a vacuum tube amplifier/preamplifier exceed several hundred volts. To prevent electric shock, do

not remove the top chassis when powered ON.

◆When operating the preamplifier with the cover open by necessity (as to test the device), do not touch the parts, terminals,

and metal parts with bare hands. Make sure to wear a pair of gloves. Find a safe place away from others who may come into

contact with the preamplifier while testing. Even when the power plug is pulled out, there is electricity remaining in the

capacitors. Make sure to wait at least 10 minutes after the power plug has been disconnected before touching any

components inside the preamplifier.

◆If you find anything unusual while using the preamplifier, immediately turn OFF the power and unplug the power plug from

the outlet, and refer to "Troubleshooting" on page 12. If you cannot solve the problem, consult your local dealer or EK

JAPAN.

◆Do not use the preamplifier under an electric environment other than the preset power supply voltages. Normal household

current is Alternating Current (AC). Do not connect to a DC power supply.

◆When connecting and disconnecting the preamplifier with other devices, be sure to turn OFF the power and unplug the

power cord plug from the power outlet. Read the instruction manuals of the connected devices carefully and follow their

instructions.

◆When connecting or disconnecting the preamplifier to/from other devices, make sure to have the power of all the devices

turned OFF. Failing to do so may cause damage to the preamplifier and connected devices.

◆Before turning ON, switching inputs, or plug/unplug the headphone terminal, turn the volume control to minimum in order to

prevent sudden bursts of high volume that may cause auditory disorder or speaker and headphone damage.

◆Adjust the sound volume slowly to an appropriate level, especially with headphones, to prevent sudden burst of high volume

that may cause ear injury and auditory disorder.

◆If water or any unwanted substance gets into the main body of the preamplifier, immediately turn OFF the power and

unplug the AC power cord. Wait for at least 10 minutes, open the chassis and remove/wipe off the substance, and consult

with your local dealer or EK JAPAN. Failing to do so may cause failure, fire, or electric shock.

◆Hold onto the AC plug or connectors when unplugging. Do not unplug by yanking the AC power cord, as it may cause

potential injury, fire, or electric shock.

◆Do not put heavy items on or under the AC power cord. Do not place the preamplifier near any source of heat, such as a

heater. Doing so may damage the AC power cord and cause fire or electric shock. Do not use damaged AC power cord.

◆Do not plug/unplug AC power cord with wet hands. Doing so may result in electric shock.

◆Handle the preamplifier gently, especially the vacuum tubes as they are made of glass.

◆Place the preamplifier on a stable surface to avoid a falling hazard. Place the preamplifier in a location where nothing could

fall onto the preamplifier.

◆Keep out of direct sun, extreme hot and cold, humid or dusty areas as they may cause accidents and damage. Do not allow

gas or corrosive substances to come into contact with the preamplifier. Failing to do so may cause damage or hazard.

◆Make sure the preamplifier is placed at least 3cm away from walls and surrounding objects as the preamplifier will radiate

heat. Do not place the preamplifier on a thick carpet, or in an enclosed space such as a drawer, or a box that will obstruct

ventilation. Do not cover the preamplifier with table cloths, towels, pillows or anything that may cause fire.

◆Clean the preamplifier regularly. If dust accumulates on the circuit board, it may cause fire or other hazards. It is

recommended to clean the preamplifier before the start of humid or rainy seasons.

◆The preamplifier is designed for home use. Do not use it in environments that it would push the preamplifier beyond it's

limitations.

◆Discard the preamplifier according to the rules and standards in your region. Failing to do so may cause damage to the

environment and others.

◆When transporting the preamplifier, remove the vacuum tubes from inside the chassis to prevent damage to the tubes.

� �

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' + - ' . & " " + ( + � + % 4 % ' ! % % ' . # & ( � 6 + " + , % ' . & ) # " 0 % + & , 0 & 6 6 & , $ & # ( & % ' # + - ' %! , / � $ % 0 + # 0 * + % " 2 Ã ' 0 1 % ' 5 & � % ! - ! % % ' 5 & � % ! - 0 ' 0 1 . & + , % " & , ½ < 3 ¼ ¾ � 7 ( % ) , Ë ! , /Ì < � ¿ Í Î 7 ! , / ( % ) , Ë Ï ! , / ¾ Ï � � Î 2 ' , ! 0 ' 0 ' 0 1 . & + , % " ' & ) # + - ' % $ + - * # 7 0 ' 0 1 % ' " & � / # + , - 0 & , / + % + & , & $ ½ < 3 ¼ ¾ � % & ½ < 3 ¼ ¾ � 23 $ + % / & " , & % " ' & ) � ¿ Í Î 7 0 ' 0 1 % ' " % % + , - ! , / " & � / # + , - 0 & , / + % + & , & $ Ã < � 7 � ¼ Ã 7 Á ¾ É 7Ã � Ð ¾ Ã Ä ¿ 7 À É � ¾ É Á 7 Æ 8 ¼ ! , / Ñ Ä 23 $ + % / & " , & % " ' & ) � � Î 7 0 ' 0 1 % ' " % % + , - ! , / " & � / # + , - 0 & , / + % + & , & $ Ã < � 7 � ¾ ¿ 7 Ã � Ò ¾ � Â ! , /À É � 2 , � 4 & , 0 ' ! , , � & $ % ' Ó � ' & , & 3 , Ó! 6 . 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( & 5 23 $ + % / & " , & ) " ' & ) × � � Î 7 0 ' 0 1 % ' " % % + , - ! , / " & � / # + , - 0 & , / + % + & , & $ � ¾ � 7 ¿ 7 3 Ã Á ¾ É 7 Ñ � 7Ã � Ä ¾ � Ò 7 ! , / À Á Ð ¾ É Í 2; . & . . + , - , & + " & 0 0 * # " ) ' , % ' . * " ' " ) + % 0 ' " & , % ' ( ! 0 1 & $ % ' . # ! 6 . ! # . # " " / 2 ¼ ' + " + " , & # 6 ! � 2 ¼ ' . * " ' " ) + % 0 ' " " ' & * � / , & % ( . # " " / ) ' + � % ' . # ! 6 . + " + , & . # ! % + & , 2¼ ' # + " , & 0 & * , % # 6 ! " * # * " / $ & # % ' . & . . + , - , & + " 2 � � ! " . # " " % ' " ) + % 0 ' " ! % � & )5 & � * 6 & # ) ' , % ' . & ) # + " Æ Æ 2 + $ $ # , 0 + , % ' ( # + - ' % , " " & $ % ' ' ! % # " & $ % ' # + - ' % ! , / � $ % % * ( " ¼ ' ' ! % # & $ % ' % * ( + " % & ' ! % * . % ' 0 ! % ' & / � 0 % # & / 7 ! , / % ' Ø 0 " " ' ! % + " " , ! "% ' - � & ) & $ % ' ' ! % # 2 ¼ ' ( # + - ' % , " " & $ % ' ' ! % # - � & ) + , - ) + � � 5 ! # 4 $ # & 6 % * ( % & % * ( 2 3 %' ! " , & % ' + , - % & / & ) + % ' % * ( Ô * ! � + % 4 2

13

7. Connection

R L R L R L R L

If the outlet is equipped with a terminal, connect the ground terminal to it.

Power indicator LEDPower SW

Input selector

Caution!

LINE1

LINE2 LINE3

PHONO

Ground wire

Stereo pin (RCA)plug cord

Portable music player, etc

LINE3 IN is equipped with a pin(RCA) jack and a mini jack. Mini jack has the priority.

After power ON, it blinks 32 times until it warms up.

* Cords and cables to connect devices are not included. Please prepare ones that match the devices you use.

Make sure to turn OFF the power of all the devices before connecting/disconnecting cords.

Stationary CD player, DA converter, Tuner, etc

Record player* For a player with built in

equalizer, connect to LINE IN.

* Some players do not have one.

Power amp and speakers

Cartridge typeselector

Pressed ：MC Not pressed ：MM

Stereo mini plug (3-pole)

(without resistors)

Flat/Line amp partGain SW

Pressed : Approx. x1Not pressed: Approx. x3

When the amp is used outside Japan, make sure to set the VH connector to appropriate position in Page7 according to your local voltage engironment, and use a plug converter that matches the outlet of your residence.

8500-02

AC cord

Plug into outlet

BACK

FRONT

Volume control

� �

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. / 0 1 0 2 1 0 2 3 4 5 6 0 1 7 8 9 2 : 4 4 5 ; 4 6 05 2 3 4 8 2 : ; 4 1 0 1 < ; / 2 ; 5 2 = 0 ; / 0 < 2 5 0 5 7 > 0 ? @ 7 10 A 4 B 9 2 ? 0 3 ; C ; 4 6 0 ; / 2 ; : 2 3 6 0 8 7 4 3 > 8 1 7 5 9 2 1 B 7 4 7 1 < D E ? ; / 7 4 F / ; / 0 5 7 > 0 ? B < ; / 0 < 2 5 0; 4 6 0 < 8 1 7 5 > B 8 8 0 1 0 3 ; 5 2 3 4 8 2 : ; 4 1 0 1 < G B ? ? / 2 9 09 2 1 B 2 ; B 7 3 D . 7 0 I J 0 1 B 0 3 : 0> B 8 8 0 1 0 3 ; < 7 4 3 > < 6 H : / 2 3 F B 3 F ; 4 6 0 8 7 1 ; / B < J 1 7 > 4 : ; 2 1 0 ; / 0K L E M N O P Q Q R L @ 5 0 > B 4 5 F 2 B 3 > 4 2 ? ; 1 B 7 > 0 C D . / 0P Q Q R L B < ; / 0 P 4 1 7 J 0 2 3 0 A 4 B 9 2 ? 0 3 ; S 2 3 > ; 4 6 05 7 > 0 ? < G B ; / 2 > > B ; B 7 3 2 ? ? 0 ; ; 0 1 < 2 ; ; / 0 0 3 > 7 85 7 > 0 ? : 2 3 6 0 4 < 0 > @ K L E M N 2 T K L E M N G 2 C DU ? 0 2 < 0 3 7 ; 0 ; / 2 ; 7 ; / 0 1 ; 4 6 0 < < 4 : / 2 < ; / 0K L E V N O P Q Q R W @ / B F / F 2 B 3 > 4 2 ? ; 1 B 7 > 0 C : 2 3 3 7 ; 6 04 < 0 > B 3 ; / B < J 1 7 > 4 : ; D. / 0 J / 7 3 7 0 A 4 2 ? B X 0 1 2 5 J < ; 2 F 0 4 < 0 < 2F 0 3 0 1 2 ? S J 4 1 J 7 < 0 Y Q 1 0 8 0 1 1 0 > ; 7 2 < 2 3 Z U S E [ U D. / 0 Z U S E [ U 8 B ; 8 7 1 7 ; / 0 1 : 7 5 5 0 1 : B 2 ? ? H2 9 2 B ? 2 6 ? 0 Z U S E [ U < ; / 2 ; 4 < 0 ; / 0 < ; 2 3 > 2 1 >] Y U R S > 4 2 ? J B 3 : 7 3 8 B F 4 1 2 ; B 7 3 2 3 > 4 < 0 2 ^ K L _J 7 G 0 1 < 7 4 1 : 0 DE J / 7 3 7 0 A 4 2 ? B X 0 1 2 5 J > 0 2 ? < G B ; / 5 B : 1 7 < B F 3 2 ? 4 : ; B < 2? 7 G 3 7 B < 0 9 2 1 B 2 3 ; D ` 7 5 0 4 < 0 1 < 5 2 H G 2 3 ; ; 70 I J 0 1 B 5 0 3 ; G B ; / < G 2 J J B 3 F 2 3 Z U S E [ U ; / 2 ; 5 2 HF 0 3 0 1 2 ; 0 < B F / ; ? H 5 7 1 0 3 7 B < 0 6 4 ; 5 2 H 7 8 8 0 1 2 5 7 1 00 3 a 7 H 2 6 ? 0 ? B < ; 0 3 B 3 F 0 I J 0 1 B 0 3 : 0 D

Y 3 < 7 5 0 B 3 < ; 2 3 : 0 < < G B ; : / B 3 F : 7 5 J 7 3 0 3 ; < G B ; / / B F / 0 1F 1 2 > 0 : 7 5 J 7 3 0 3 ; < 5 2 H B 5 J 1 7 9 0 ; / 0 < 7 4 3 > D Q 2 J 2 : B ; 7 1 D ` G B ; : / B 3 F: 2 J 2 : B ; 7 1 < 1 2 3 > 7 5 ? H 5 2 H 3 7 ; B 5 J 1 7 9 0 ; / 0 < 7 4 3 > S 2 3 >5 2 H 0 9 0 3 : 2 4 < 0 J 1 7 6 ? 0 5 < D b 0 1 0 2 1 0 < 7 5 0 F 4 B > 0 ? B 3 0 < 8 7 10 I : / 2 3 F B 3 F ; / 0 : 2 J 2 : B ; 7 1 < 8 7 1 6 0 ; ; 0 1 < 7 4 3 > A 4 2 ? B ; H D` 4 8 8 B : B 0 3 ; < J 2 : 0 / 2 < 6 0 0 3 J 1 7 9 B > 0 > 7 3 ; / 0 U Q \ 8 7 1< 4 6 < ; B ; 4 ; B 7 3 7 8 ? 2 1 F 0 1 7 1 > B 8 8 0 1 0 3 ; : 7 4 J ? B 3 F: 2 J 2 : B ; 7 1 < @ Q K K T Q K L T Q K c T 2 3 > Q K d C D . / 0 : 2 J 2 : B ; 7 1 0 > G B ; / ; / B < = B ; 2 1 0 3 7 3 S B 3 > 4 : ; B 9 0 J 7 ? H J 1 7 J H ? 0 3 08 B ? 5 ; / 2 ; : 2 3 < 4 J J 7 1 ; / B F / 8 1 0 A 4 0 3 : B 0 < D Q / 2 3 F B 3 F G B ; /7 ; / 0 1 : 2 J 2 : B ; 7 1 < 5 2 H 3 7 ; B 5 J 1 7 9 0 ; / 0 < 7 4 3 > A 4 2 ? B ; H D Y 8< 4 6 < ; B ; 4 ; B 3 F : 2 J 2 : B ; 7 1 < T 5 2 = 0 < 4 1 0 ; / 0 : 2 J 2 : B ; 2 3 : 0 B 2 1 0 1 2 ; 0 > 8 7 1 2 ; ? 0 2 < ; L e e 9 T 2 3 >; / 2 ; ; / 0 H 8 B ; 7 3 ; / 0 U Q \ Dh i j k l j m n o p q k r p j n l l j s t n m s q r p j u n l k m v t l n r p j w s x u k q p y l j s z k y s j { r v z n w t n m j m o j | z } k m ~ j n l w n { q u q z k o q n m s k m { q m { p v k s v n y o n z n m { y z o s y z }z n w t n m j m o j | z } k m ~ j k m { w n { q u q z k o q n m k o v n y l n m l q s k m { l j s t n m s q r q p q o v h i j { n m n o t l n q { j z k t k z q o n l s n l o y r j s u n l j | z } k m ~ j p j k s j t y l z } k s j o } j w u l n w k l j t y o k r p j j p j z o l n m q z n l k z y y w o y r j j m { n l

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¡ ¢ £ ¤ ¥ ¦ § ¨ © ª « © ¨ ¤ ª £ ¤ « ¬ ¨ ¥ ª « ¢® ¯ ° ± ² ¯ ³ ± ´ µ ¶ ¯ · ² ° ¸ ³ ¯ ´ µ¹ º » ¼ ½ ¾ » ¿ À Á ¼ Â Ã Ä ½ ¼ Å Á ÆÂ ¸ Ç È ´ ² ³ É ² ³ Ê ´ Ë ³ ¸ · ÌÅ ¸ ¯ µº ° Ì Í ² Ì µ ± Î ° Ì Ï É ´ µ Ï Ì Ð Ñ Ò Ó Ô ÕÄ À ° ¸ ³ ¯ ´ Ð ¿ Ö º Ñ ¼ Õ¹ Á × Ø ¼ » ¿ Ù Á Ú ¼ Â Ã Ä ½ ¼ Å Á ÆÂ ¸ Ç È ´ ² ³ É ² ³ Ê ´ Ë ³ ¸ · ÌÅ ¸ ¯ µ Ð Û Ü Ö Ý ÕÄ À ° ¸ ³ ¯ ´ Ð ¿ Ö º Ñ ¼ Õ¿ µ É ² ³ ° Ì Ï ¯ Ï ³ ¸ µ ± ÌÚ ¿ ¼ ¼ Ì Í ² ¸ Ë ¯ Ý ¸ ³ ¯ ´ µ¿ µ É ² ³ ³ Ì ° Þ ¯ µ ¸ Ëß ² ³ É ² ³ ³ Ì ° Þ ¯ µ ¸ ËÃ ´ à Ì ° Ê ´ Ë ³ ¸ · ÌÃ ´ à Ì ° ± ´ µ Ï ² Þ É ³ ¯ ´ µá ¯ Þ Ì µ Ï ¯ ´ µ Ïâ Ì ¯ · ã ³

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ô m u n l w j l o q w j s k z y y w o y r j y s j { o n r jk { n t o j { u n l j j l v j p j z o l n m q z z q l z y q o u n y m { q ml k { q n s õ ö s z n w w y m q z k o q n m r l n k { z k s o q m ~{ j q z j s s n y m { k w t p q u q z k o q n m k m { z n w t y o j l s ÷ n j j l l q s j n u s j w q z n m { y z o n l s k p w n s o q t j {o } j w n y o q m k w n w j m o ø p o } n y ~ } k z y y w o y r j sk l j m n p n m ~ j l u n y m { q m w n s o j p z o l n m q z { j q z j s o } j v } k j k s o l n m ~ u n p p n q m ~ k m { k l j t n t y p k lk w n m ~ s o k y { q n t } q p j s q m s n y m { k w t p q u q z k o q n m øs n p q { s o k o j k w t p q u q j l s } n s k p w n s o q { j k pw j k s y l j { k p y j s } j l j k s k k z y y w o y r jk w t p q u q j l } k j } q ~ } p j j p n u m n q s j k m { { q s o n l o q n m ù l n w k q j t n q m o n u w j k s y l j { k p y j s k k z y y w o y r j k w t p q u q j l w y s o r j n r q n y s p vq m u j l q n l o n k s n p q { s o k o j k w t p q u q j l ú n } v q s q os k q { o n } k j k r j o o j l s n y m { û y k p q o v üõ } j r q ~ ~ j s o u k z o n l q s o } k o o } j k z y y w o y r jz } k l k z o j l q s o q z s z y l j q s û y k { l k o q z u y m z o q n m r v } q z } k k z y y w o y r j t l n { y z j s k { q s o n l o q n m s nz k p p j { s j z n m { } k l w n m q z õ } j s j z n m { } k l w n m q z q sk u l j û y j m z v { n y r p j o } j n l q ~ q m k p s n y m { k m { k mn j l o n m j u k z o n l } q z } k l j k r y m { k m o p v t l n { y z j {r v k l q n y s w y s q z k p q m s o l y w j m o s k m { ~ q j s { j t o }k m { l q z } m j s s o n o } j s n y m { ý m o } j n o } j l } k m { o } j { q s o n l o q n m t l n { y z j { r v k s n p q { s o k o j k w t p q u q j lq s w n s o p v o } j w y p o q t p j s n u n { { m y w r j l s s y z } k so j l o q k l v k m { û y q m o q z õ } j l j u n l j k s n y m { { q u u j l j m ou l n w o } j n l q ~ q m k p s n y m { q s t l n { y z j { } q z } q sy m t p j k s k m o o n p q s o j m j l s õ } q s q s } v k l q n y sz n y m o j l w j k s y l j s k l j o k j m u n l k s n p q { s o k o jk w t p q u q j l o n p j s s j m o } j { q s o n l o q n m o n } k j q o z p n s jo n þ j l n k s w y z } k s t n s s q r p j

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tube preamp kit tu-8500 - kerlee.com · (15-30w) solder (for electronic parts) (diameter 0.8-1.2mm)...

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