I have been into HiFi audio for a while, and i have toyed around with modding/assembling amps and the like....but i always wanted to built a tube amp....so i did!
The amp is all finished, and it works awesome!
Details - its a self inverting Push-Pull Class A amplifier, using EL84 power tubes and 5751 driver tubes
The output transformers are Hammond 125D's 9600 ohm input impedance, 6ohm output impedance
The power transformers - the filament heater is 12.4v 4A, the input tranny is 180-0-180 250ma, both Hammond
Its all DC rectified (even the heaters) and extensively filtered. I get practically no hum whatsoever.
Power output is about 8 watts per channel
Here are some pics (click on thumbs for bigger pic)...excuse the messy wiring inside, its my first time! I'm planning a more powerful project and ill spend more time on the case and wiring
P.s its not completely old school...for anyone familiar with push-pull class A tube design, class A must be forced in the circuit design i have used. Full class A operation is forced by the use of 2 LM317 voltage regulators (1 for each channel) wired up to supply constant current which is used to set the bias on the tubes...