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RE: GZ37 seems brighter when power tube changed to EML 520B v3 ???

Posted by Tre' (P) on September 26, 2014 at 16:34:18

In Reply to: RE: GZ37 seems brighter when power tube changed to EML 520B v3 ??? posted by Michael Samra on September 25, 2014 at 20:34:33:

"Being the tubes use the same filament supply as the rect tube"

I not sure that would work.

The Art Audio Jota HC monoblocks IMO has to have at least 3 separate filament supplies.

One for the rectifier tube and one for each output tube.

If all three windings are common to one power transformer (along with the HT winding) and if one power tube, compared to the other, draws more plate current maybe that's loading the whole power transformer down and lowering the filament winding's voltages.

But I don't know if the plate current is being adjusted when the output tubes are changed or if it can be adjusted without changing cathode the resistor value.

Something for Jay to think about.

Tre'

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Edits: 09/26/14

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