Metal Panel 50w Marshall

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Metal Panel 50w Marshall

Postby LD50 on Tue Aug 22, 2017 6:25 am

No affiliation (although not far from me)

Plexi tones on the cheap?

http://www.ebay.co.uk/itm/1973-MARSHALL-JMP-METALFACE-PLEXI-50w-bass-handwired-/152664457641?hash=item238b82c1a9:g:U0UAAOSwQ6pZkrht

You can tell the service not done by someone totally 'au fait' with theses amps as they replaced the Presence pot for scratchiness (we know they all do that due to d.c. on the pot) and needs a minor mod. to add some screen resistors to be able to run modern EL34s.
All bleeding stops.......eventually.
LD50
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Re: Metal Panel 50w Marshall

Postby DrainBamage on Wed Aug 23, 2017 5:19 pm

That's a interesting example. Fellow wiring the board ran out of 100ks. 68k and 82k PI plates, V1 plates, cathode follower and negative feedback.
Wonder how it sounds?
DrainBamage
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Re: Metal Panel 50w Marshall

Postby pdf64 on Wed Aug 23, 2017 5:47 pm

That's strange. well spotted.
Do the tube sockets look to be an unusual type?
My band:-http://www.youtube.com/user/RedwingBand
pdf64
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Re: Metal Panel 50w Marshall

Postby LD50 on Wed Aug 23, 2017 9:37 pm

Yes, well spotted!
Confess I did not look that closely
We know of lots of cap combinations they used when they ran short, not see anything like that resistor issue before.
All bleeding stops.......eventually.
LD50
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