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Audio power amplifier by "19", direct heated twin triode

A project log for Vacuum tube game in 21st century

Playing vacuum tube is not so difficult as expected. Let's play great heritage of human being by modern technology!

kodera2tkodera2t • 06/30/2019 at 12:32•2 Comments

Before I've got it by a very low price but its style is luxurious ST tube, named "19". It is 1930's direct heated twin triode and I guess it is not so popular for audio maniacs (guessing from its price.)

Its datasheet says "class B twin amplifier" not "vacuum tube" or "direct heated twin triode" and the purpose of this tube was strictly specified for "push-pull".

So I quickly made push-pull power amplifier by just three components, tube and input and output transformers. Each of trans was just available one and this amp does not have any clever design, just connecting! (as the data sheet says, this tube may be class-B amplifier by its nature..)

Actual operation can be found in the following movie. Indeed, its sound is very nice!!
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Still another vacuum tube to come

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Discussions

Ken Yap wrote 07/01/2019 at 07:12 • point

Wow, so old it doesn't have a standard heater voltage. Cool!

  Are you sure? yes | no

kodera2t wrote 07/01/2019 at 07:37 • point

Yeah, it's super classical tube of "radio is working by A, B, C battery" era. (still not AC power line was not used..)

  Are you sure? yes | no

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