Amp/Preamp Asylum

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Push Pull or Single Ended?

Posted by Frihed89 on May 24, 2010 at 01:56:51:
Class A PPs are few and far between. Audion is a good example. There are a few more, but I have forgotten. This is perhaps the best for a reasonable price. Audion shares the same designer as the old Audio Innovations and early Audio Note UK.
I would add that directly heated trioded (DHT) tubes, like the 300B and 2A3 can be used in class A PP configuration, and perhaps the best example of this is Allen Wright's design at Vacuum State, although it is different type of PP than normally seen. DHT PP amps, i was told, are hard to balance and if one tube starts to drift, you need to replace both. The Vacuum State amp does NOT have this problem.