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Base theme by DesignModo & ported to Powered by Vanilla by Chris Ireland, modified by the "theFB" team.
Comments
Is it the pot that's been changed or just the knob? Although in fact, all the knobs are replacements, it's just that the presence one is newer and the colour doesn't match.
The reason the presence pot produces noise is because in the original circuit it has DC on the pot track - that was changed in the mid 70s - and replacing it doesn't fix the problem.
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
Well, well... very interesting to hear all the opinions.
The knobs were poss changed by me in the 80s and for some reason I I didn't change the presence knob. Nor was Martin able to find a replacement, hence the mismatch.
An amp 'tech' in London replaced the presence pot with something fiddly which Martin rectified, hence what you see now.
I still have the invoice from Gartone for all his work done and a bag containing the old parts, inc Bulgin plug.
I wouldn't want to sell if the price wasn't high enough. I'd keep it and sell my 18/20 combo n custom extension (as advertised here).
I wish I could work out how to post pics as I now have a load of the amp post-Martin :-)
Please let that work..... :-)
Is the impedance selector fused inside or has it been bypassed? A fuse would be a very bad idea...
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
I would very much doubt Martin at Gartone would do anything unnecessary or dangerous, if that is what you mean. I have no idea about the impedance selector. I just play em. :-)
The selectors are one of the major hazards for all old Marshalls, and one of the reasons so many suffered blown transformers - personally I would always hardwire the mains one for safety reasons, but if you have any doubts at all as to whether the fuse has been bypassed, it's better to use the red cap on the voltage selector and the black one on the impedance. If the amp suddenly stops working then the fuse has blown!
I should have some spares of the correct 'bean' inserts, I'll send you one if you want.
Having seen the power transformer I can confirm that it's one of the early ones intended for a valve rectifier by the way - the two terminals for the rectifier filament winding are the unused ones at the top left in the pic.
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
Thanks for that info. I'm amazed at your knowledge :-)
I had no idea about those red selectors, of course. I may investigate but certainly swap them for now.
I'll happily buy the insert. I'll PM you.
Cheers!
The head case effect on price will really depend on the the buyer, sell it like it as and it will attract buyers looking for a better price and willing to put soem effort in to get it back to spec. but buyers who want it perfect will probably avoid it.
Yes, the first pic was before Gartone.
I note you don't have a head box in your site for a JMP these days. Will you be making any?
Michael