That appears to be a bass guitar amp. So this begs the question, is the OP building a hifi or guitar amp?
Hi to all! I am looking for a 15 to 20 w single ended amp......The initial idea is to make an amplifier like the mathcless spitifire but with more power........12ax7 as a phase inverter.
Some Australian guitar amps designed around sweep tubes used a voltage-doubler power supply, which conveniently also generates a half-B+ voltage, which was used for the screen grid bias.The plan in #12 requires a CT on the HV winding...
So it looks like the OP could have his cake and eat it too - use a pair of EL84s in push-pull just like the Spitfire does, borrow the power supply design from the Traynor Guitarmate, and get even more than the 20 watts he wants."It (i.e. the EL84) can produce 17 W output in Class AB1 in push–pull configuration. Many guitar amplifiers routinely run EL84 tubes in excess of 400 VDC, with the Traynor Guitarmate reportedly putting out 25 W RMS with 2 EL84s in a push–pull configuration and a B+ between 400–420 VDC."
Many guitar amplifiers routinely run EL84 tubes in excess of 400 VDC, with the Traynor Guitarmate reportedly putting out 25 W RMS with 2 EL84s in a push–pull configuration and a B+ between 400–420 VDC."
Thanks for the reply. I desist for the SE o EL84 pp idea. Im working on this desing now.
I don't see any obvious faults and it should make plenty of power, even more with a real 4 ohm load on that OPT. I would use a 50 or 63 volt cap for the cathode bypass cap on those 6DQ6's. They tend to need a lot of bias voltage.