This amp has two resistors in series with the filament leads of the 12BY7 input stage. It appears this drops the filament voltage by about one volt, to 5.3V or so. Any idea why HK would have done this? None of the other tubes in the amp are treated this way.
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Topic - HK Citation V - Triode_Kingdom 10:31:50 04/29/21 (14)
- Bench did work that showed filament starved tubes {not output} had lower distortion - Cleantimestream 13:38:21 05/02/21 (0)
- RE: HK Citation V - sony6060 11:30:29 04/29/21 (9)
- RE: HK Citation V - Jim McShane 14:56:35 04/29/21 (6)
- RE: HK Citation V - Triode_Kingdom 18:07:58 04/29/21 (5)
- RE: HK Citation V - Tre' 10:13:38 04/30/21 (2)
- So... Noise, not Hum? - Triode_Kingdom 14:12:16 04/30/21 (1)
- RE: So... Noise, not Hum? - Tre' 14:54:24 04/30/21 (0)
- RE: HK Citation V - elblanco 19:51:21 04/29/21 (1)
- RE: HK Citation V - Triode_Kingdom 21:35:37 04/29/21 (0)
- RE: HK Citation V - Alpha Al 13:07:35 04/29/21 (0)
- Interesting - Triode_Kingdom 12:19:17 04/29/21 (0)
- RE: HK Citation V - Story 11:24:03 04/29/21 (2)
- That's the original schematic from the '60s - Triode_Kingdom 12:09:41 04/29/21 (1)
- RE: That's the original schematic from the '60s - Tre' 12:28:42 04/29/21 (0)