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op.9 wrote:

A 20w tripath and a 5w El84 set per channel is a sensible and cheap combination. The tripath and line level crossover section could be thrown in for free!

Ah, the EL84! That brings so many memories…. I was 9-10 years old and was running a PP with Russian 6N14P. Somebody told me that there was a “capitalist” equivalent for this tube and it had a mysterious name EL84. I found that EL84 tube (how that hell we did it at that time without eBay?) and leaned that my amps begun to sound better. I was very surprised….

To the broader decoud’s subject about the DSETs – it unquestionably the direction to go as it deliver better result for less cost – I know, I know – to controversial for high end audio’s objectives. A right selection of tubes and good architectural design would be a very useful in this direction. The tubes should have the “same” sound and be able to be driver by the same driver stage. It would be nice to have a design where the LF output tube would be driver by voltage double from the MF output tube or something like this. For instance the 2A3/45 for MF and GM70/211 for LF – juts hypothetic…

BTW, pay attention to the universality of 6C33C. It does sound very fine for MF and allowed to be used at “half anode” but at the same time it has remarkable low plate impedance and can do a very good 15-20W LF tube. They might still need two separate PS most likely…. The best would be a tune with 3-4 plates what the plated would be connected according to loading needs…

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