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Carlsbro Showman parametric/1 oscillating amp , 1990
1 channel good the other one even with a 27 ohm load oscillates at 65
percent of mains and above, bursts peaking at 40 KHz dropping back to much lower f, extinguishing and restarting over 5 seconds or so. power amp probably much like Carlsbro S600M Anyone have any leads to schematic? uses 4x MJ15024 , 2x SM2177A, 2x SM2178A each ch predriver DC levels (prior to oscillation) certainly different to the good ch but no obvious reason other than rain got into the amp A lamp will go in each of the +/- rails before I fiddle again ignore any apparent email address appearing with this posting |
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