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Questions about tubes and gear that glows. FAQ

Sudden arc-over

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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