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Wojtek wrote:

P.Q is not a designer nor he is an "electrician" but Andy Grove who designs circuits and transformers for AN is. I'm sure he'd know very well what you're talking about. Whatever your opinion of AN sound is they have lots of experience with designing transformers for the circuits ,and they have resources for R&D which most of small ,independent winders simply lack.

P.Q is not an “electrician”, he is a marketing buffoon. Anyhow, I do not care or value the AN’s R&D, there are more interesting and more capable places, not to mention that why AN would suddenly experiment with custom designs? As far as I know AN, they experiment ONLY with something that they can steal and to market. A sub 1Ohm, LF-only, 5-7Hz, 20W, with fast core transformer is not something that they will find committal viable as they do not do any DSETs – so I do not think that they might be sufficiently vested inot this project

Wojtek wrote:

I don't think DHT you're looking for exist but you may pitch the idea to Czech manufactureres -they are the most adventurous of the pack  or contact that DIY guy who makes his own tubes.

Actually it is a good idea. I do not know how interesting those Czech guys are in terms of Sound but if they or perhaps somebody eagles feel that it might be a market for high Mu DHT then it might lead to something. As I understand DHT has very small cathode and therefore very small cathode emission. Who knows if the people have objectives of a single stage DHT then they would come up with a special high transconductance version. Unfortunately I am a not a DHT enthusiast and I would not sponsor the R&D toward this end – if somebody will make it I might give it a chance, despite that it would be the contemporary production.  Meanwhile I have more interest in possibility to found high Mu from vintage and “obtainable” triodes. The obtainabilety is an important factor as I like to run my amps brutally and I do not care about the life span of “kinky” vintage tune that I happened fish at eBay. If I would not have a supply of those tubes for 20-30 years then I would not use it.

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