In Reply to: RE: NYAL OTL 3 posted by v_n_naidu@hotmail.com on May 23, 2012 at 02:01:01:
Hi !Remove and check all trim pot`s with ohm meter , one by one , but without turning trim pot sliders .
I`m suspect that Amp upper bank of power tubes which plates glow orange have no correct G1/G2 bias beacose of bad bias trim pot .
Sign of incorrect power tube bias is that you don`t have exactly 1/2 of V1,2,3 B+ plate voltage on the lower bank of power tubes plates .
For example :
If you measure +300V on the upper power tube plates (V1,2,3) terminals than you have to measure exactly +150 V on the lower power tube plates terminals .Best Regards !
Edits: 05/23/12 05/23/12
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Follow Ups
- RE: NYAL OTL 3 - Banat 03:45:34 05/23/12 (8)
- RE: NYAL OTL 3 - v_n_naidu@hotmail.com 04:30:13 06/05/12 (7)
- RE: NYAL OTL 3 - Banat 09:26:22 06/05/12 (6)
- RE: NYAL OTL 3 - v_n_naidu@hotmail.com 01:17:04 06/06/12 (5)
- RE: NYAL OTL 3 - 714rhino 02:48:12 06/08/12 (4)
- RE: NYAL OTL 3 - v_n_naidu@hotmail.com 01:18:00 06/11/12 (3)
- RE: NYAL OTL 3 - 714rhino 21:27:37 06/19/12 (2)
- RE: NYAL OTL 3 - v_n_naidu@hotmail.com 06:40:55 06/20/12 (1)
- RE: NYAL OTL 3 - 714rhino 19:25:17 06/20/12 (0)