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In Reply to: RE: Transformers, ideal plate loads, and real life results posted by TubeAcolyte on May 10, 2016 at 09:21:35
That amp originally used 6CA7 fat bottle tubes, which can take higher voltage than EL34's.I don't know if KT66's will take that or not.
Another consideration: The Traynor schematic shows G3 wired to G1 instead of to the cathode, as usually done. (6CA7 and EL34 both have G3 as a separate connection, brought out on Pin-1, whereas KT66 does not).
I don't know the reasoning behind why Traynor wired G1 and G3 together. I've never seen that done anywhere else. You would have to deal with that somehow.
Edits: 05/10/16Follow Ups:
Oh, that's the YBA3. Feeding the bias into suppressor grid was a weird one. There's some controversy as to what it really does. Some sources say it's a safety feature to avoid a catastrophic failure if the bias at the control grid is lost. Others say it would do the opposite by causing excessive screen draw while choking your plate on the regular.
Tone wise it doesn't help anything. I've read of one guy trying it with his guitar amp with a quick mod-in/mod-out. It lent to a more compressed sound, but it also became spongy, lifeless, unnatural, and left the playing feeling "distinct disconnect between how the amp sounds, and how it feels to play." Having played a YBA3 before, I can attest to this. It doesn't sound all that great. It has a certain bass-oriented presence, and perhaps it just needs the right speaker to express the amp properly. Not my cup of tea.
But ya, that's the YBA3. I'm talking about YBA1A - it doesn't feature that craziness.
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May your tubes be lively, warm, and long-lasting. Holy be thy heater.
Gotcha. I have two schematics for YBA-1. One shows 6CA7's, the other 7027A's. Neither shows that weird G3 hookup as YBA-3 does.
I'm not sure what Pete Traynor was thinking. I don't want to harp on the man's work, but my close experience with two Traynor amps thus far has left me a little disappointed.
My YGL3 is kinda like a Fender Twin Reverb but again wired ridiculously with the bias feed into G3, which definitely dulls its sound. The first preamp stage is wired as a blackface Fender, while the 2nd is voiced like a Marshall. There's no negative feedback. Plus, just for fun, the reverb is recovered on an EL84...
Quite simply, this amp is out to lunch and all over the place!!! I'm thinking of unshackling/liberating my YGL3's G3 from the bias feed and see what happens...
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May your tubes be lively, warm, and long-lasting. Holy be thy heater.
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