late 60s Marshall JMP

shagual

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Join Date: Aug 2008

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#1

late 60s Marshall JMP

11-06-2010, 06:57 PM

I'm having a look at a late 60s jmp 1987 model.

Can someone help me with dating the amp or estimating its value?:

- SN: S/11170
- No bias pot: 68k bias resistor instead of the 47k + 25lin pot
- I believe it's completely original only 1 resistor( v2 bias) + power tube socket have been replaced.

thanks.

Last edited by shagual; 11-06-2010, 07:04 PM.
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Chuck H

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Location: pacific north west
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#2

12-11-2010, 06:13 AM

is there a letter following the serial #?

"Take two placebos, works twice as well." Enzo

"Now get off my lawn with your silicooties and boom-chucka speakers and computers masquerading as amplifiers" Justin Thomas

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shagual

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Join Date: Aug 2008

Posts: 20
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#3

12-11-2010, 08:08 AM

Amp has been sold in the meanwhile for 2200euros

Apparently it was an early '68 plexi 50w.
specs: no bias pot, B+ voltage was around 440dc
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