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

RE: two questions about 45 and 300b..............thanks

1) 45, 2A3, 300B, 845 - they can all sound very similar if operated at the right conditions. The normal conditions commonly used are not similar in the right (nondimensionalized) sense, which IMHO is responsible for a large part of the popularly perceived differences.

2) You can easily get 5mV hum out of a 300B into 8 ohms, using AC filament power. If you really work hard on the problem, you might get as low as half that but it's probably not worth the agony. A 2.5v 300B ("2A3-40") would give half the hum much more easily. Otherwise DC is the answer, and as in 1) works fine if done right.

In both cases, "done right" is not a simple concept and we are collectively still discovering what exactly that means.


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  • RE: two questions about 45 and 300b..............thanks - Paul Joppa 04/3/1415:47:48 04/3/14 (0)

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