Here it is
Yes I've built a bunch of different kinds of SE amps in my day. This is quite typical retro type SE amp; not bad to listen to, but not very good either if I'm being honest. Fun to build though, and very very informative if you go thru the trouble to find out what happens inside it.
As drawn, the output section doesn't pass any kind of audio signal thru the OT. There's a mistake somewhere.
Either it's meant to be a parafeed type amp, in which case it needs a plate load of some kind between KT66 anode and B+. Resistor, choke or a SS module of some kind.
Or, it's meant to be ultrapath amp, in which case B+ needs to be inserted at the junction of the OT primary and C704 (the ultrapath cap). Then the OT primary can act as a plate load in the usual way for series feed OTs.
It's probably the ultrapath one. The voltage markings are just made somewhat misleadingly. In that case the cathode caps are 100% completely unnecessary. Ultrapath trades cathode bypass caps for the ultrapath cap; it's a higher impedance node, so you can get by with a smaller capacitance, 30µF film cap in this case. Easier to use film caps than 100µF cathode bypass cap.
This is exactly what the CCS doesn't do. The CCS provides balance and stability to the signal. Not sure where you got that info?
Indeed. I suspect gug42 is talking about some other thing, not a CCS used as a tail. Or, he doesn't understand what goes on inside a balanced pair.
The most simple way to go : use one R by triode (not by tube but by triode), for sure less fun than a cccs ...
If you are talking about your SE amp that's another thing. Separate cathode resistors in a balanced (or using the old terminology, push-pull) stage is just counterproductive.
And moreover, if you find that you have enough gain, no obligation to use a bypass cathode capacitor. Less distortion.
Ok I'm pretty sure you're talking about a SE amp here, right?
I'm very happy there is excitement to try the CCS tail mod. It's not a fix-everything magick pill for the LD, but Sonic reported it as a noticeable improvement. Also it'll help ease some underlying worries about "THAT SS SOUND" that a lot of people might still have.