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  1. I'd pull V2 and see if channel 2 volume still...

    I'd pull V2 and see if channel 2 volume still interacts when plugged into channel 1.

    Also, check the grounding on the input sockets. I can't see it with this amp, but i had a similar situation...
  2. I remove SMD electrolytics by shearing through...

    I remove SMD electrolytics by shearing through the entire cap with some very sharp cutters. The leads should be in line with the jaws so they're not forced together under pressure. This method...
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    A 335 has a routed section at the side of the...

    A 335 has a routed section at the side of the bridge pickup that gives access to the body cavity. I attach strong dental floss to each pot shaft before removing the entire harness through the access...
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    Your original signal is reduced when you split it...

    Your original signal is reduced when you split it in this way. Also, you're reducing the overall impedance of what your guitar is seeing and this in turn rolls off even more top-end. With delays I...
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    Nice. I'll send him a link to this thread

    Nice. I'll send him a link to this thread
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    PCB manufacture

    Someone asked me yesterday about getting low-volume 100mmx70mm double-sided PCBs made and I said I'd look here as I'd seen various recommendations. Except I can't find anything recent. So, for those...
  7. Doug Hammond's Firefly uses a cascode front end...

    Doug Hammond's Firefly uses a cascode front end and it works superbly.
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    Musicman Majesty electronics

    Does anyone here have any experience of the MM Majesty preamp and associated switching electronics? The one I have in for inspection mutes the output immediately after powering up.
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    As Enzo points out, an OT primary usually shorts...

    As Enzo points out, an OT primary usually shorts when it fails. Most often this involves a single or small number of turns. A DMM will show you if a winding is open, but a single shorted turn makes a...
  10. Cascading the triodes and using a dual volume pot...

    Cascading the triodes and using a dual volume pot works well. My main amp has this arrangement and will go from really clean to more than enough gain off a single knob.
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    The tester has a 2-wire mains connection with no...

    The tester has a 2-wire mains connection with no earth and no isolation, though.
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    People get fixated about tube brands, which era...

    People get fixated about tube brands, which era they're from, whether they're NOS (new old stock) or whatever mojo they want to attribute to them. There's a load of rubbish talked about tubes and...
  13. I wondered if there was an internal level...

    I wondered if there was an internal level compensation somewhere to even things out, but taking a look at some of the schematics for the modules agrees with what you'e saying - the topology is fairly...
  14. Randall MTS module volume difference

    I have a Randall MTS with a volume difference where the owner considers the Deluxe module is lower in overall output than the Top Boost or SL Plus. It doesn't actually seem too bad to me - just a...
  15. This should match. Also, do any of the lead...

    This should match. Also, do any of the lead channel controls have any influence on the problem? They should be inactive of course when the rhythm channel is selected.

    56044
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    The only really accessible custom manufacturer...

    The only really accessible custom manufacturer for pots in small production quantities I've found is Omeg in the UK. When I contacted them the minimum order was 10 units and the cost was not much...
  17. Peavey refers to the channels as rhythm and lead....

    Peavey refers to the channels as rhythm and lead. Crunch is an additional gain boost function of the rhythm channel, not a channel in its own right. Does the fault occur on the rhythm channel without...
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    In reply to post #2, I've had recent exchanges...

    In reply to post #2, I've had recent exchanges with the Taiwan Alpha factory to clear up confusion over products being sold as Taiwan Alpha that I suspected were not, as the quality was very poor and...
  19. Yes, I frequently do this when troubleshooting...

    Yes, I frequently do this when troubleshooting these amps.
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    A combination of wedges made from FR4 which were...

    A combination of wedges made from FR4 which were inserted from oppsite sides and then two levers used at right angles to the wedges. Two knobs came off with levers made from FR4 strips but I used a...
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    +1. The noise is usually caused by the fault...

    +1.

    The noise is usually caused by the fault placing an excessive load on the power supply, This overcomes the ability of the smoothing capacitors to maintain a steady DC supply and the ripple is...
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    Interestingly, Marshall went to stand-up...

    Interestingly, Marshall went to stand-up transformers for some amps (100W plexis) in '69.
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    Plenty of amps have both transformers as stand up...

    Plenty of amps have both transformers as stand up - Traynor springs to mind as one manufacturer.
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    I checked the serial number and confirmed with...

    I checked the serial number and confirmed with the owner that the guitar is a '67, not '69. He's delighted though that the original knobs and pots got retained, so it was worth the effort. The...
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    If you swap the bolt out for a countersunk one...

    If you swap the bolt out for a countersunk one you can do a 'formed countersink' in the chassis. The easiest way to form this is to use an allen head high tensile bolt about 1.5" long. On the inside...
  26. I've experimented with sag in SE amps and the...

    I've experimented with sag in SE amps and the results can be quite good but adds to the complexity. The idea came from an old Gibson amp schematic and I implemented it with a vactrol driven off the...
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    Not clear to me - you didn't mention your test...

    Not clear to me - you didn't mention your test method, you just said they test the same, but I'm not clear in what context "the same" means - the same as each other, or the same as a verified case...
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    Case hardened parts have a very hard skin and...

    Case hardened parts have a very hard skin and usually test harder than a regular heat treated steel. Thin parts are usually more economical to make from a heat treatable steel rather than to use a...
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