Suncalc wrote:
M. Gregg wrote:
Ie is there a compromise.
Yes. But it's complicated. The amp's performance is based on the 40% tap used by Edcor on the GXSE. Obviously you're not going to get that with the LL1663.
The default would be to use pins 5/11 for the screen. This is a 50% tap and frankly, the differences between this and 40% are not that major. This is rigidly halfway between pentode and triode modes. I haven't tried it but I doubt most people would notice a difference between this and a 40% tap.
But that's normal in all things DIY. YMMV.
Thanks for the answer,
If all else failed, you could drop the CT voltage with a series regulator to get it down.
Yes, the "Close to pentode" tap would be interesting.
I tried the pentode connection using driver supply AKA Magnavox and other variations on a small SE.
Stiff regulated pentode/ Electron stream and diode-triode. (Taste varies

)
I was interested in your thoughts on the 50%, as you say just a bit different.
Also your thoughts relating to the trade off Edcor Vs the "Better output TX".
Its strange Lundahl don't provide the additional tap for use on the SE version "which is air gapped".
(Not interchangeable / rewireable SE or PP) I guess it’s a cost constraint.
Just something to consider looking at other Output Tx's.
Just a thought, hopefully they bring the terminations for 5/11 out to the connection block on the SE version.
Regards
M. Gregg