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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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In Reply to: RE: 813 in triode posted by Tubenstein on May 16, 2016 at 05:56:29:
Quote: "Since the 813 is a pentode, it can be using AC for filament supply with AC balance adjustment instead of those "heavy duty" filtering for DHT, right?"
I am not sure what you mean by "heavy duty filtering for DHT", but I use standard AC for all my direct heated tube amps - particularly for those where 2.5V or 5V are required (2A3, 300B).
The 813 needs 10V and a lot of current (5A) thus it hums quite loudly on standard AC (100Hz hum with the AC balance adjustment which BTW is not needed, 2 well matched resistors are just fine for balancing) -- which is why the HF AC solution (modified electronic transformer for halogen bulbs) comes into play.
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- RE: 813 in triode - Alex Kitic 10:07:32 05/16/16 (0)
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