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Links to Marshall schematics
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http://www.marstran.com/50W%20Bias.htm
Setting your bias using the shunt method for a specific plate dissipation.
http://www.marstran.com/Variac%20Voltage.htm
The effects of 120v into the 105v-115v tap
http://www.marstran.com/Measuring%20Primary%20Impedance.htm
How to measure the primary impedance of an output transformer.It's All Over Now
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"I took a photo of my ohm meter... It didn't help." Enzo 8/20/22
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Originally posted by Mickey View PostI'm in need of a schematic for a Marshall G80RCD amplifier.
Attached FilesOriginally posted by EnzoI have a sign in my shop that says, "Never think up reasons not to check something."
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I have recently had a Marshall Super Bass Mark II 1992 to look at and couldn't find any circuits that matched what was in front of me. There are a couple but made prior to 1979 when this one was built. They show the 4 ohm f/b tapping and the 4.7k across the presence circuit but not the quite extensive reworking of the tone controls and in particular the lack of a cathode follower!!.I've stayed up way to late with this -redrawing an old Unicord schematic and got a headache in the process! Has anyone seen or got a copy of this particular model ??? It does not appear to be "modded" outside the factory - the resistors seem to be those old dark red 1/4 watt philips type from the '70s..
I have found someone who was working on one but no schematic ! Hope to add more to this later after some sleep !!
Here's the link I found :- https://oldamps.weebly.com/marshall-...ce-repair.html
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