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I've had this Marshall head since about 1983 or so and I've recently been looking it over and noticed that 3 resistors in the bias circuit have been changed from 220k to 150k. A few years ago I converted it from 6550 to EL34s and you can seen the metal film resistor I piggy backed to get the bias correct.
The amp sounds fantastic but do you think I should replace those 3 resistors with 220ks and re-bias again? If I were to replace them I'd like to find the type that were in these amps, if their still available.
Here's a pic and schematic. It's easy to pick out the 3 resistors.
The amp sounds fantastic but do you think I should replace those 3 resistors with 220ks and re-bias again? If I were to replace them I'd like to find the type that were in these amps, if their still available.
Here's a pic and schematic. It's easy to pick out the 3 resistors.
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