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This basic circuit works very well with KT88.6550 type tubes...

...as long as you organise a higher B+ of up to 500V. Follow Russ's point of a choke input filter if at all possible, as it makes a BIG difference to the sound.

If you go for two pairs of output tubes, then I'd suggest using 6H30's as the driver tubes with 12k anode loads and lots of current - in fact this is the exact tube line up you can expect to see very soonas a kit from Brian Cherry's DIYHiFi Company (Hong Kong), and also from (my) Vacuum State in Europe.

Triode connected - two pairs of 6550 will easily deliver 50 watts of extremely good pure Class A1 sound with this circuit.

Regards, Allen


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