Congratulations, GRoper !!
This is exactly how my own preamps are designed - and they run on +24V.
This is exactly how my own preamps are designed - and they run on +24V.
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#2
The Newcomer's Forum / Re: Peavey 45W PA-100 Tech Says Junk It !!
April 07, 2013, 09:24:17 PM
Get yourself a freeze-spray can - in a pinch, auto refrigerant.
Spray the driver transistor and the output transistors, and the emitter resistors. Also, use a magnifying glass to check the PCB tracks, perhaps wash the whole board with alcohol.
Spray the driver transistor and the output transistors, and the emitter resistors. Also, use a magnifying glass to check the PCB tracks, perhaps wash the whole board with alcohol.
#3
The Newcomer's Forum / Re: Mashall MG15CDR just went up in smoke!
July 08, 2010, 10:09:50 AM
Yes, and you can flip the PCB and verify that the heatsink solder pads don't connect to anything - check for swarf, etc.
#4
The Newcomer's Forum / Re: Mashall MG15CDR just went up in smoke!
July 06, 2010, 09:50:29 AM
No need to worry - the chip IS bolted directly to the heatsink, which is left UNCONNECTED to any wiring traces on the pcb. I just use regular white lithium grease - works great.
#5
The Newcomer's Forum / Re: Mashall MG15CDR just went up in smoke!
July 02, 2010, 12:41:16 PM
C25 and R34 are the Zobel network - Marshall is NOT using the datasheet recommended values, but you can get the parts from RadioShack.
#6
The Newcomer's Forum / Re: Mashall MG15CDR just went up in smoke!
June 17, 2010, 10:47:10 AM
Check the Zobel network (resistor-capacitor in series across output) - I have found the capacitor blown on a number of the Marshalls that us the TDA2025 chip...
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