Hi guy's I have DSL50 here for repair that i had acquired from another technician that took a shot at repairing this amp. I received the amp with all the opamps fried. What he had done was he plugged up the secondary of the xfomer that supplies the +/- 15v incorrectly. Once i figured out what he had done i replaced the opamps and a bad ECC83 (V4) and then proceeded to check and make sure the wire harnesses were in there correct sockets. Well the amp fires up fine, bias is good, and i get a clean output on the scope with a 8ohm load and 1khz for the input. But the problems is i am not getting enough output. The most i can get is 2.8v across the 8ohm load.

These combo's were fitted with two Marshall labeled Celestion 12' speakers. The power amp schematic is the same as of the 2104/2204. Pre amp schematic, 79119. 2000 Lead, 250W head. Pre amp schematic with 6x ECC83 Issue 2 (Marshall, 1981). DSL bias board circuit diagram, JCM2-64-00 Issue 1, (Marshall, 1997).

It seems all the voltages are there. Now i am thinking the tech had put the wires back on the output transformer incorrectly. Now the schematic does not show colors or the extra taps on the transformer so i am not sure everything is in the right place. Does anyone have the correct diagram on how to plug up the output transformer or maybe i need to be looking somewhere else. Also forgot to note i did change the output tubes and also i have used the return loop on the effects as the input to make sure its not the front drive board.-Thanx Bill.

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