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Single Ended Triodes (SETs), the ultimate tube lovers dream.

RE: 300b set versus 300b parallel set

Yes, the parallel 300b and 2a3 amps I heard do retain the sonic characteristics of their output tubes. But, there are those who don't like parallel output tubes because, they claim, the sound is not as pure and clear as when only one tube is utilized.

I spoke with a designer who claims that it is very difficult to implement parallel output; even when the tubes are carefully matched at the outset, they quickly become unmatched, with one tube being much stronger and doing most of the work (hence, the output is not much different from running a single tube).

With my own parallel 2a3 amp (Audio Note (uk) Kageki), I have indeed found that the tubes do become unbalanced, with one measuring weaker than the other, but, the amp sounds good and I don't push them very hard so I don't need the extra power.


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