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Old 29th May 2005, 01:38 PM   #1
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Join Date: May 2005
Location: Alabama
Cool Hi everyone! from Alabama, USA

Greetings. I've been into electronics for a long time since I was very young, but I've always tread the line between art and science. I think I used to be a lead guitarist, but I can't remember as I've been playing bass professionally for several years now. My SWR sm-400 amplifier blew up , so I've been working on that for a nice, long time now:
Approach 1: replace all burnt and shorted parts. (Duh!)
Result: a slightly less impressive firework
Approach 2: Order more parts. Consider things like complimentary performance, full operational tests on parts that otherwise passed DVM tests, staged power up strategy including using diodes for BE-junctions, initial current limiting on power lines, etc.....
Result: more like a lit match than a firework.
Approach 3: By this time, I had a complete set of output transistors, though not matched very well. I put little pico-fuses on the driver T's. I've left the bias down for now, and it is stable at idle.....(to be continued)
(hey, maybe someone can start a thread on service nightmares!)
Anyway, glad to be on diyAudio!
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Old 29th May 2005, 06:12 PM   #2
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Join Date: May 2005
Location: Alabama
I'm a fellow Alabamian and just found this site as well. It looks to have tons of useful information.
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Old 31st May 2005, 01:48 AM   #3
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Join Date: Feb 2005
Location: Northeast PA
Welcome & you may want to use a autotransformer & bring the supplies up slowly.
The fuses are a great idea, they leave them out due to cost, but are well worth the $$$.

Good luck!
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