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Old 14th April 2009, 04:39 AM   #11
mosfets is offline mosfets  Canada
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Up the fuse beyond spec, add parallel speakers, play loud and long and voila! Toasty resistors and transformer coils oozing their coatings.

I was a kid once, good times. Blow it up then build it better. I can't think of anything more fun. The really cool part about tubes; in many cases it is hard to destroy the speakers. Sorry for the meandering off topic but the image in the first post brings back good memories.
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Old 14th April 2009, 03:26 PM   #12
nhuwar is offline nhuwar  United States
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So play'en the death metal smoke'em LOL



Super massive crazy distortion from which of the likes GOD has never heard LOL






Sorry couldn't resist, that the way I like to play some times LOL
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Old 24th April 2009, 12:01 AM   #13
llwhtt is offline llwhtt  United States
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FWIW, I worked on a Peavey Valve King 100 today and thought of this thread. It uses the same 400 Ohm/ 10 Watt resistor. It was all I could do to get 40VDC across it, meaning, in a properly functioning amp the most it dissipates is 4 Watts. I still say bad tube(s). Also the power supply uses 100UF/550V capacitors from Nippon Chemicon. I looked on their website but these must be made for Peavey as I could not find anything over 450V. Anyway I thought they would make a nice big filter bank WITHOUT stacking them, doubling capacitance with the same number of caps as long as your PS is under 550VDC.

Craig
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Old 26th April 2009, 10:19 PM   #14
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From the first post I didn't undestand if there is really a malfunction problem or just the aspect of the fried PCB. It looks like the burn is from a previous dead resistor and who changed it mounted the new one too close. Maybe a better lighted picture will clarify this, but IMO this resistor doesn't look like an old/overloaded one...
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Old 26th April 2009, 11:27 PM   #15
llwhtt is offline llwhtt  United States
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That was one of the questions I asked, is the resistor actually bad or just called bad because of the roasted circuit board. Never got an answer.

Craig
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Old 27th April 2009, 09:37 PM   #16
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The resistor is good. It does not show discoloration. Something else around it (in the schematic) does not fell very well, though.....
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Old 28th April 2009, 03:06 PM   #17
ke4mcl is offline ke4mcl  United States
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are you sure your amp has never been serviced before? thats alot of burn on that board for such a good looking resistor! those burn marks may be old damage previously repaired.
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Old 28th April 2009, 03:20 PM   #18
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Could be that too, sure. But the resistor looks slightly discolored, and it being such a high wattage, it would mean that a LOT of current passed thorough it. Melted 6V6 's?
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