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In Reply to: GZ34/5ar4 question posted by M. Vidal on July 19, 2016 at 12:28:25:
If tube is defective or there are issues with the PSU or output section.
Otherwise, loss of bass transient response or dropping B+ could be signs the rectifier is getting old & weak.
IME, good US made vintage 5Y3GT types last the longest. US made 5U4GB. Then Mullard-Philips GZ34. For some reason, the small 9-pin EZ80 and EZ81 seem to have shortest life (maybe too much demand by the unit).
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Follow Ups
- Sudden arc-over - FenderLover 01:57:25 07/20/16 (4)
- I think it depends upon what they are in. . - John PA 12:36:15 07/22/16 (0)
- 9-pin EZ80 and EZ81 - Chip647 05:18:44 07/20/16 (2)
- RE: 9-pin EZ80 and EZ81 - FenderLover 07:10:44 07/20/16 (1)
- RE: 9-pin EZ80 and EZ81 - Triode_Kingdom 21:25:24 07/22/16 (0)