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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.

R1, R10, R1362.2Meg Pot R22470K 1/2W Resistor R321 Meg 1/2W Resistor R42220K 1/2W Resistor R52330 Ohm 2W Resistor R62220K 1/2W Resistor R722.2Meg 1/2W Resistor R821Meg 1/2W Resistor R91720 Ohm 20W Resistor R11233K 1/2W Resistor R12222K 1/2W Resistor C1, C940.005uF 400V Capacitor C220.05uF 600V Capacitor C3220uF 25V Electrolytic Capacitor C420.01uF 400V Capacitor C52200uuF 400V Ceramic Disc Capacitor C6, C7215uF 450V Capacitor C8215uF 400V Capacitor T11117V Primary, 350VCT Secondary, 6.3V Secondary, 6.3V Secondary T227600 Ohm Primary, 4 or 8 Ohm Secondary SW11SPST Switch SP1, SP2212″ or smaller, 4 or 8 ohm speakers MISC15 tube sockets, 2 RCA jacks, PC board or chassis, wire, knobs, etc