Marshall Guitar Amplifiers Parts
October 12th, 2007 | 
Author: 
Guitar amplifier problem?
Hi all, I have a Marshall Lead 100 Model 3210 Amplifier Head cranks fine, but after 10 minutes more or less, I lose total volume, not power. If I turn off the amplifier and then turn the amplifier back, or if I can increase the volume to maximum and play sometimes I get all my volume back. I have already changed these parts without success: All potentiometers Jack plugs All All All capacitors transistors All IC `s (op-amps, etc) and check out for any joint dry as possible! Any idea what it is or why this amp does this? Thanks and any suggestions would be appreciated.
The evidence suggests that it is a thermal problem. As things heat up, the problem arises. You say you have replaced all transistors and integrated circuits. Does that include the power transistors? Check to make sure it is snug against the heat sink and the proper amount of thermal paste (Phase transition or other materials) is present. As for the capacitors, which replace the coupling caps between stages? Probably not the problem (when no, usually does not return). You can also still have a weld joint somewhere. I've seen solder joints that look good on initial inspection, but if you look closely you can see the initiative "floating" in the weld. Finally, are you sure that all the staying power to? The fact that the pilot is in does not mean that the supply of products are working. An amplifier as you will need something like + and – 40V (or more) for the MOSFET power, 5 or + and – signal path and probably another good stress derivative for good measure. 5. Lucky for Greetings from Austin, TX, Ken
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