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Resistors smoking and burning out on ht line

Hi i have a marshall jcm2000 tsl60,it turns on but when u flick the standby switch on r32 10k 1w started smoking then r64 1k 1w,both on the ht line.ive replaced these resistors plus the capacitors around it but still the same fault.any ideas?

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To be passing enough current to burn the powerrail resistors there is clearly a short to earth from the HT line. Given the circuit of that amp, unless there is physical damage to internal wiring causing the problem, the most likely cause of the problem is one of the ECC83 preamp valves failing with an internal anode to cathode short. Have the valves tested or if there is nowhere local test them yourself with a resistance meter. Check pins 1 to 3 and 6 to 8. There should be no connection in a good valve. Its also worth checking there is no continuity between the heater filament and these pins (heater is pins 4,5 and 9). If you find a fault then discard the valve and buy a new one, repair the dead resistors and try the amp again.

Posted on Jul 18, 2009

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