owing to my deville being stuck elsewhere at the moment, i had to use our singer's TSL122...
An hour after being turned on for the first time in about 3 months, things suddenly started to smell of burning - two of the output tubes were glowing red and shortly after that the fuse went... guessing this is a case of blown tubes?
if i replace the fuse and the glowing red EL34's hopefully everything will work fine (seriously, who puts 100w into a 2x12...) but will it need re-biasing afterwards?
On the plus side, it meant having to use the studio's Rockerverb 50, which was lush beyond words...
bias bias bias...
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bias bias bias...
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Mike
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Were they red-plating? i.e. very obvious red patches?
The bias could be way off or they could be bad tubes, or something else on the TSL could be suspect. Fuses blow for a reason, it could be bad tubes, the bias being messed up or another fault which caused it. It may well just blow again, but new tubes and a fuse would be the first thing to try.
The bias could be way off or they could be bad tubes, or something else on the TSL could be suspect. Fuses blow for a reason, it could be bad tubes, the bias being messed up or another fault which caused it. It may well just blow again, but new tubes and a fuse would be the first thing to try.
they didn't seem to be doing anything out of the ordinary beforehand, apart from being a bit quieter than normal . then caught a whiff of electrical burning and two of the four power-amp tubes were glowing bright red - first time I've seen anything like this though. Figured that new tubes and fuse would be a reasonable place to start and if it's still not right then check the bias and/or get it serviced.
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