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| Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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Crate BX-100 amp
I got this in, and someone else had attempted to repair it, the other guy
told me he had replaced the finals several times but they kept failing on power-up. Looking at the output stage I think one of the FET's may be incorrect. Could someone check the schematic and see if this unit is supposed to have 2 IRFP140's for finals (both outputs N-channel?!)? I believe this should have a complimentary output pair, IRFP140/IRFP9140, N and P channel, but as I did not see it before parts were changed I'm not sure. Jammy |
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#2
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Crate BX-100 amp
ampdoc wrote: I got this in, and someone else had attempted to repair it, the other guy told me he had replaced the finals several times but they kept failing on power-up. Looking at the output stage I think one of the FET's may be incorrect. Could someone check the schematic and see if this unit is supposed to have 2 IRFP140's for finals (both outputs N-channel?!)? I believe this should have a complimentary output pair, IRFP140/IRFP9140, N and P channel, but as I did not see it before parts were changed I'm not sure. Jammy Call SLM and they'll email you the schemo. Just for reference, posting in alt.guitar.amps will get more responses. |
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