K&K Audio / Lundahl Transformers

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K&K Audio / Lundahl Transformers

RE: Can LL9202ampp be ordered with a cathode feedback winding?

106.70.220.147

In Reply to: RE: Can LL9202ampp be ordered with a cathode feedback winding? posted by amnesiac on February 24, 2019 at 04:46:48

Kevin I have a sent a request to Mr Lundahl I hope you where serious about asking him to make a pair. I Am not sure why he would make a pair for me if you haven't been able to get him to make you a pair. A can imagine it would be difficult.

Follow Ups:

RE: Can LL9202ampp be ordered with a cathode feedback winding? - KevinC 18:58:16 03/05/19 (1)
It doesn't hurt to ask.

When I earlier wrote to the effect that wouldn't we all like to have what you describe, I was wishing for what can't exist and deliver the promise that all of the various tubes could deliver with the right transformer. Sorry if you took my comment as encouragement, but it was really a statement of "good luck, but I doubt it can properly be done".

Kevin Carter
K&K Audio
www.kandkaudio.com
- RE: Can LL9202ampp be ordered with a cathode feedback winding? - amnesiac 04:12:49 03/07/19 (0)
  Kevin I sent him an email which he answered personally he also included a sheet on the ll1620 5% If I remember right which is not listed normally only the 25% But Iam not sure I understand it right but I think he said the primary is split not the secondary. I thought it would be the secondary so the feedback is across the output and not just the valve. I can easily apply plate to grid fb to reduce the plate resistance. I see the problem with the ll9202 is the capacitance killing the hi frequency especially with hi plate resistance tubes like 75tl and I read about the guy on aa that was having much trouble getting a se one with the secondary grounded to do enough hiend.I Am sure its going to be an issue with any 20k trans. Anyway Mr L said not currently is he going to design one.

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