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In Reply to: RE: AES SE-1 Blowing Fuses posted by returntohifi on September 14, 2014 at 14:54:00
It could be a number of things. That cap could be shorted, the diode bridge could've failed, there are ways that a tube could fail to take this out (unlikely).
Replace the bridge and cap, then fire up the amp and see what happens. I would also recommend measuring the resistance between the green wires. It should be low, but no 0.
Follow Ups:
Hi BP,
Thanks for the info. I measured the resistance between the two green wires at 0.5 ohms. Is that OK? If not I will separate them and put on new heatshrink. I will replace the parts as you suggest.
Thanks again.
Alex
Why take a chance with that wire? Cut them at the transformer and add new wire and heat shrink the splice. You can turn on the amp in "standby" (or remove all the tubes) and measure the voltage on the filament wires to ensure the transformer is OK.
Hi Palustris,
Thanks for the suggestion. I will splice on some new wire. I needed to cut 3 inches off the old wires since the insulation melted along that length. The rest of the green wires to the transformer are clean and fully separated from each other. I am still wondering what could have caused such high temperatures. Could the failure of the bridge rectifier cause this?
Alex
It is clear that too much current caused the failure. We could speculate endlesly about what 'might' have happended; now is the time to start trouble shooting. What voltage did you measure when you turned on the amp in "standby" (or remove all the tubes) and measured the the filament wires?
Hi Palustris,
I am a novice when it comes to troubleshooting tube amps and I am doing a lot of research and asking a lot of questions right now. I am proceeding slowly and cautiously. I will get the new bridge rectifier in a week or so. I will reassemble and retest.
Thanks for the suggestions.
Alex
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