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07-02-2009, 09:32 PM
| #1 |
| Junior Member Join Date: May 2008
Posts: 8
| Peavey 400BH blows fuse
I have a 70's Peavey 400BH that blows the fuse after about five or six seconds of being turned on. I can hear it draw down power on a small fan I have plugged into the same outlet. Any Ideas Bruce |
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07-03-2009, 03:23 AM
| #2 |
| Senior Member Join Date: Nov 2007 Location: Springdale, Arkansas
Posts: 273
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Have you got a schematic and do you have any basic electronics experience? Soldering skills, using a multimeter...etc |
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07-03-2009, 07:13 AM
| #3 |
| Senior Member Join Date: May 2006 Location: Lansing, Michigan, USA
Posts: 10,366
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Answer Twists questions first. I'd be expecting shorted output transistors. Schematic
__________________ Education is what you're left with after you have forgotten what you have learned. |
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07-06-2009, 10:26 PM
| #4 |
| Junior Member Join Date: May 2008
Posts: 8
| Have schematic
"Have you got a schematic" Yes. and do you have any basic electronics experience? Soldering skills, using a multimeter...etc I have built my share of tube amps. I checked all the output transistors (by removal) All appear to be good. Bruce |
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07-07-2009, 01:33 AM
| #5 |
| Senior Member Join Date: May 2006 Location: Lansing, Michigan, USA
Posts: 10,366
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Isolate the problem. Disconnect the secondaries from the board - the oprange wires, and the red wires - and power up. Does the transformer running alone like this still pop fuses? Look up "light bulb limiter." Make one. Use it. Or use a variac and ammeter. If the transformer is OK, connect the orange wires. only. Blow or no? Then the red ones. All outputs "appear" to be good? None measure shorted on a meter? Check ALL rectifier diodes in the powr supply. ANy shorted? Make sure CR9, CR13 are not open, and that the connections to CR13 are OK.
__________________ Education is what you're left with after you have forgotten what you have learned. |
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