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In Reply to: RE: 2nd, the "short" issue, downstream posted by FenderLover on November 28, 2015 at 21:34:31
Thanx guys. I will be checking the caps in the power supply. Besides the meter I also have an LCR meter. I usually don't use a film cap if it measures more than 10% off value. For electrolytics I usually avoid them if they are more than 10 years old. But, in my power supply the caps are all film, except for 2 in the driver/splitter tube power supply. Of which one showed some leakage but, I had previously removed that one prior to the power up so I am not sure about the other caps. regards, primo
Edits: 11/28/15Follow Ups:
If I suspect any of the filter caps, in the main PSU, I just replace them. Usually, the first pi-stage's caps get the most abuse and fail the earliest.
Caps in this stage can be far off the rated nominal value and not cause catastrophic damage to the rectifier or fuses to blow. 50% or more from nominal. Now, they prolly won't filter as well as a good tolerance cap. But, they really need to be near short to ground or no conduction at all, to cause major damage to other parts. At least, in my experience.
Only in my case you could hear-em crackling. Also look for charcoaled parts and other visual clues.
But can't you pull the output tubes out and see if the rectifier still turns red to rule the outputs out. Is that a real sentence????
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