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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: Audible Illusions 1 low B+ problem posted by DAK on March 24, 2014 at 21:36:33:
Pull one leg of the PT's secondary to make sure it's putting out HV.
Reconnect it and do the same to each stage until you get to the 12K resistor. Of course, make sure the passives are good - use your Fluke.
If all is good, then replace (or test) the NPNs, but replace the LM723 and the zeners .
IIRC the MJE8500's replacement is NTE2303.
As for the NPNs ....The ones that test bad still look fine.
Put in some sacrificial 6922's.
DON'T power it up w/o tubes!
Cheers,
W
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Follow Ups
- RE: Audible Illusions 1 low B+ problem - wheezer 03/25/1411:19:44 03/25/14 (6)
- RE: Audible Illusions 1 low B+ problem - DAK 13:19:53 03/26/14 (5)
- RE: Audible Illusions 1 low B+ problem - wheezer 18:34:35 03/26/14 (4)
- RE: voltage check - DAK 19:16:18 03/26/14 (3)
- RE: voltage check - wheezer 23:47:23 03/26/14 (2)
- RE: voltage check - DAK 08:55:40 03/27/14 (1)
- RE: voltage check - wheezer 11:44:07 03/27/14 (0)
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