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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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Hi all, I resurrected my Scott 208 from the dust bin of my storage container, and have started playing it although I run the AC thru a variac set at 110vac. This level puts the DC plate volts of the output tubes as stated on the schematic pretty much spot on although I know this is not ideal. The amp sounds decent and pretty good compared to a 8 watt SE that i was using before. Anyway, to get to the point I was wondering about the fixed bias on the 7591 output tubes which is designated at -18vdc on the schematic at the input to the 7591. My amp at the variac setting is about -22vdc. The amp only has a DC balance pot for each pair of output tube. Am I stuck with the original design or should I change the voltage dropping resistor on the negative voltage circuit? Do I try to put a pot in the circuit for adjusting the negative voltage? Thanks for the help. Dak
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Topic - Bias adjustment? Scott 208 - DAK 21:02:41 10/19/24 (15)
- RE: Bias adjustment? Scott 208 - elblanco 09:31:53 10/20/24 (4)
- RE: Bias adjustment? Scott 208 - DAK 11:19:30 10/20/24 (3)
- RE: Bias adjustment? Scott 208 - elblanco 15:11:56 10/20/24 (2)
- straight out the gate to the plate! couple I saw years ago was from 5R4.staight on to the output transformer - Cleantimestream 09:01:57 10/23/24 (0)
- RE: Bias adjustment? Scott 208 - DAK 15:26:31 10/20/24 (0)
- RE: Bias adjustment? Scott 208 - walkstoslow 07:12:02 10/20/24 (9)
- RE: Bias adjustment? Scott 208 - Jim McShane 11:02:02 10/24/24 (0)
- RE: Bias adjustment? Scott 208 - DAK 08:15:51 10/20/24 (7)
- RE: Bias adjustment? Scott 208 - walkstoslow 11:29:42 10/20/24 (0)
- RE: Also, anyone addressed the high B+ issue on the 208 - DAK 08:24:50 10/20/24 (5)
- RE: Also, anyone addressed the high B+ issue on the 208 - Tre' 07:43:33 10/21/24 (4)
- What pin on the 7591 do I put the 10R resistor? ntd - DAK 12:10:45 10/21/24 (2)
- RE: What pin on the 7591 do I put the 10R resistor? ntd - Tre' 13:02:53 10/21/24 (1)
- RE: What pin on the 7591 do I put the 10R resistor? ntd - DAK 13:17:31 10/21/24 (0)
- RE: Also, anyone addressed the high B+ issue on the 208 - DAK 12:00:19 10/21/24 (0)
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