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Linux and DIY Electronics

Tube Pre Amplifier with Tone Control Schematic Diagram 4 July, 2008

Filed under: DIY High End Audio,Pre Amplifier — adrianangka @ 11:03 am

This is tube Pre Amplifier with Tone Control Schematic Diagram. I separate it into 3 part:

1. The Main Circuit

Main Schematic Diagram

Component List:

Resistor:

0.25 – 0.5 Watt 1%

R1, R2 ………………………………….100R – 330R

R3………………………………………..47K

R4………………………………………..680K – 1M

R7, R8…………………………………..39K

R9, R10…………………………………10K

R11………………………………………68K

R12………………………………………560K – 680K

R13, R14……………………………….100

2 Watt Resistor:

R5…………………………………………1K

RA…………………………………………220K

RB…………………………………………47K

RC…………………………………………3K9

RD…………………………………………680R

Potentiometer:

Vol…………………………………………2 X 100KA

BAL…………………………………………2 X 250KB, CT

BASS, MID,……………………………….2 X 250KB

TRE…………………………………………2 X 100K

Capasitor:

C1…………………………………………..22n/400V

C2…………………………………………..330n/400V

C3, C5……………………………………..100n/400V

C4, C6……………………………………..39uF/450V

C7A, C7B………………………………….8n2 – 15nF/100V

C8…………………………………………..22n/400V

C9A, C9B………………………………….1n/400V

C10A, C10B………………………………3n3/63V

C11…………………………………………1uF/250V

C12, C13………………………………….12p/250V

Semiconductor:

Va, Vb………………………………………Tube 12AT7

Transformer:

T1…………………………………………….In:220V, Out 16VAC, 1A

T2…………………………………………….In:220V, Out 275VAC 40mA

Tube Socket 9pin PCB mount 2X

2. Soft Start Filament Regulator

Component List:

Resistor 0.25 – 0.5 Watt:

R1…………………………………1K5

R2…………………………………470R

R3…………………………………51K

R4…………………………………220R

Capasitor:

C1…………………………………3300uF/50V

C2…………………………………47uF/16V

C3…………………………………470uF/16V

C4…………………………………100nF MKM

Semiconductor:

D1, D2, D3,D4…………………1N4002

TR………………………………….FCS9012

IC…………………………………..LM317T

3. High Voltage Regulator

Component List:

Resistor 0.25 – 0.5 Watt:

R1………………………………….1K

R2………………………………….470K

R3………………………………….330K

R4………………………………….20K

Capasitor:

C1, C2, C3, C4…………………39uF/450V

C5………………………………….10uF/25V

C6………………………………….220nF/250V

C7………………………………….100nF/400V

Semiconductor:

D1, D2, D3, D4…………………1N4007

D5, D6…………………………….1N4148

D7………………………………….1N4744 (15V/1W)

TR1………………………………..MJE13005

TR2………………………………..MPSA92

TR3………………………………..MPSA 42

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Tube Pre Amplifier with Tone Control

Filed under: DIY High End Audio,Pre Amplifier — adrianangka @ 10:58 am

Front Panel

Today I finished a DIY Tube Pre Amplifier with Tone Control. I made the kit that I bought from Bandung at 2004 . This are some small modification I made:

1. To make the tube glowing at the front panel window I modified the tube socket and pcboard to make a 3mm hole for ultra bright blue LED

Glowing

2. Change the volume potentiometer with ALPS potentiometer.

ALPS Motorized Potentiometer

3. Add Infra Red Controller so I can remotely control the volume

Infra Red Controller

4. Use Jantzen Capasitor and Solen Capasitor so The sound will be good, natural and clear

Capasitor

5. After all this modification I have to burn in so the sound output will be at the best perform of this circuit

6. Tommorow I will post the schematic