I think this amp might kick my butt lol. The main issue is, besides the distortion, it has no low end. Measuring the turns ratio in the OT, it's 50% which suspiciously is what it would be if it was a push pull OT. I'm trying to think about what else could do this but the coupling caps and resistors all seem reasonable and shouldn't be blocking the low frequencies. I'm starting to think these OT are just garbage...
I am afraid I must have missed a video, or do not understand what I thought I did, but how did the problem of increasing the cathode current by reducing the cathode resistor not end up overheating the PT? Great series and great channel in general. Thanks for all your efforts.
It will raise the B+ relative to the rectifier it replaces. A 5AR4 doesn't drop the voltage a lot, a 5U4G does. I would NOT use this with the 6V6 tubes and in fact I would stay with the china rectifier. In a stock amp or a moded one with EL34 tubes, it's fine.
I do want to stay with tube rectification. However, it would be fun to swap in a solid-state rectifier. They have drop in solid-state rectifiers that fit the tube socket. They say it raises the B+ by 10 to 20%. Is this safe to try?
Quite a roller coaster ride… I love roller coaster rides! Very nicely done. Both your work and your videos are outstanding.
Well happy ending, with a few mild mods, this amp turned out quite nice :)
I believe so, or maybe 115V? At 121V (my house) the heaters are at 6.5V, which I'm OK with. 110V PT end up with the heaters closer to 7V, which is a tube eater.
Is the power transformer 120v?
Ugh, if so, the lack of a magnetic gap would do exactly that.