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kgc-jr 4th March 2011 06:24 PM

Marshall 1987 Plexi HT Voltages
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Does anyone know or have measured the HT power supply voltages on a Marshall Model 1987 Plexi, as indicated on the attached drawing at points A, B, C, D, & E? If anycan provide those measurements or give me a good guess, that would be most helpful. Thanks in advance.


danFrank 4th March 2011 08:08 PM

B+ (A) should be somewhere in the realm of 365-380 volts.
G2 (B) should be about 5-10 volts less.
About 300-330 on the phase splitter supply.
about 20-30 volts less on the next cap after the 10K resistor and
about another 20 volts less on the last supply cap.

This is from my memory so I may be a bit off. I will check my voltage charts tonight when I get home.
Hope this helps.... Daniel

danFrank 4th March 2011 08:11 PM

1 Attachment(s)
Here's a voltage chart I found online...

llwhtt 4th March 2011 08:29 PM

The later 1987s had approx. 430VDC at point "A". Using the voltage chart you can figure out how much current each stage draws to complete the rest of the points.


firechief 4th March 2011 08:31 PM

Forum members to the rescue!!

kgc-jr 5th March 2011 01:06 AM

Great, thanks guys! This helps alot.


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