Stereo Tube Amplifier
Electronic Schematics > Audio > Stereo Tube Amplifier

By Weslee Kinsler

The circuit is simple, yet is capable of excellent performance. I designed it specifically for use as an amplifier for the digital sound card in my computer. Audio input can be from any two-channel line level device such as a television, CD player, or VCR. It is of the tube type, using only 5 tubes total with no more than about 45 Watts power consumption from the outlet. It uses 3 types of tube 1 5Y3 GT vacuum rectifier, 2 6SF5 GT high-mu triodes, and 2 6K6 power beam amplifiers. These are all full-size octal type tubes which are commonly available today for between $3-5 each.


Schematic for tube amp


Part Total Qty. Description Substitutions
R1, R10, R13 6 2.2Meg Pot  
R2 2 470K 1/2W Resistor  
R3 2 1 Meg 1/2W Resistor  
R4 2 220K 1/2W Resistor  
R5 2 330 Ohm 2W Resistor  
R6 2 220K 1/2W Resistor  
R7 2 2.2Meg 1/2W Resistor  
R8 2 1Meg 1/2W Resistor  
R9 1 720 Ohm 20W Resistor  
R11 2 33K 1/2W Resistor  
R12 2 22K 1/2W Resistor  
C1, C9 4 0.005uF 400V Capacitor  
C2 2 0.05uF 600V Capacitor  
C3 2 20uF 25V Electrolytic Capacitor  
C4 2 0.01uF 400V Capacitor  
C5 2 200uuF 400V Ceramic Disc Capacitor  
C6, C7 2 15uF 450V Capacitor  
C8 2 15uF 400V Capacitor  
T1 1 117V Primary, 350VCT Secondary, 6.3V Secondary, 6.3V Secondary  
T2 2 7600 Ohm Primary, 4 or 8 Ohm Secondary  
SW1 1 SPST Switch  
SP1, SP2 2 12" or smaller, 4 or 8 ohm speakers  
MISC 1 5 tube sockets, 2 RCA jacks, PC board or chassis, wire, knobs, etc.  


1. Email Weslee Kinsler with questions, comments, etc.

2. The 6V6 GT tube may be substituted for the 6K6 to lower power requirements.

3. C8 is for radio interference suppression and may be omitted.

4. The 5Y3 GT tube should be mounted in a vertical position and be well ventilated. The 6K6 and 6SF5 tubes can be mounted in any position.

5. Controls should have an audio taper.

6. The power supply portion of this unit may be used for anything requiring 290-320v DC up to about 3 amps.

Title: Stereo Tube Amplifier
electronic circuit
Published on: 2005-02-01
Reads: 1625
Print version: Print version

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