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Happy to answer any questions - I have some notes and took some pictures. Never did trace the schematic as it was a "loose wire" fix....
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Marshall Bass 12 5501
Anyone got a schematic for the Marshall 5501 Bass 12?
All the references I've been able to find have different component refs to the one I have in front...
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Tried changing all the anode/plate resistors. No difference.
The caps are all either mustard or more modern yellow poly caps, with the exception...
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Watkins Super Mersea Crackle
Got a Watkins Super Mersea here that is taking some time. (See Custom 15 Schematic enclosed, which is a very similar, if not identical amp)
It...1 Photo
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Actually. I have a theory. Apparently Selmer bought a Copicat from Watkins with the intention of copying it for the Selmer 200. Charlie Watkins got wind of...
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Selmer/ Uni-Ton Swissecho 462
There are schematics out there for the 463 but none for the 462.
Main difference appears to be around the motor. But if anyone out there has...
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Take a look at the schematic. What on earth is going on in the cathode circuit of the oscillator?
There is apparently 6V DC across the erase...
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No I'm not mistaking the two kinds of bias. It was just an observation that it looks a lot like crossover distortion. I guess they are both caused by a dead...
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Right. Just got back to this.
I measured the inductor in the bias oscillator circuit (3.8mH) and with the cap (4.4nF) gives a bias frequency...
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Rexer/ Guyatone RTE-3000 Tape Echo
Now this is a long shot.
Anyone know of a schematic for these?
Basically a much-cheapened Space Echo clone
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I've had literally dozens of these rewound for UK mains. You need to get them out of the bitumen they are encased in which is disgusting and probably carcinogenic....
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Some 68K resistors at the grid pins of the 6SC7s fixed it. It didn't totally get rid of pickup but it's massively improved.
In answer to various...
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Fender 5c5 Pro RF Pickup
Fender-Pro-5C5-Schematic.pdf
Got 5C5 Fender Pro here. It's picking up cellphone radiation like crazy. Adding foil screening has reduced the problem...
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You would think so. But I found this on The Vox Showroom's site. It seems to show the Bass control as described but the Treble wired the other way round i.e....
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AC30 Top Boost Tone Controls
I feel like I may be starting a holy war here. But what is the "right" way round for AC30TB Treble and Bass controls? I've seen them wired both...
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AC30 With NR1 Normalizer
Got a barn find 63 or 64 grey panel Standard AC30 here.
In place of where a rear-panel mounted Top Boost module might go, it's been fitted with...
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None of the links to F-30 schematics work. Has anybody got one?
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Mercury diffusion vacuum pumps spitting back mercury vapour. Terrifying.
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Selmer Model 200 Tape Echo Bias Frequency
Got a Selmer 200 tape echo from the early 60s here. The echo is good and strong, but it sounds sort of gritty - almost like it was being clipped.
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