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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: phasing issue posted by vinnie2 on July 3, 2017 at 05:13:39:
That sounds about right.320vdc times 30ma is 9.6 watts
The 6bq5 will dissipate 14 watts (12 for the plate and 2 for the screen grid)
You could go a little higher safely.
320vdc times 35ma is 11.2 watts and that would be 80% of max dissipation (still in the "safe zone").
BTW with 8.8 volts at the top of the 130 ohm cathode resistor each tube IS running at 33.5 ma but that just shows that something is wrong.With only a 130 ohm cathode resistor those tubes should be running 80ma each.
I think your tubes must be worn out or the plate voltage is not what you said it is or something else is not what you say it is.
Tre'
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Edits: 07/03/17
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Follow Ups
- RE: phasing issue - Tre' 08:07:24 07/03/17 (3)
- RE: phasing issue - vinnie2 12:15:06 07/03/17 (2)
- RE: phasing issue - Tre' 14:06:21 07/03/17 (1)
- RE: phasing issue - vinnie2 15:24:42 07/03/17 (0)
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