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    I'm thinking that even if it was a bare chassis...

    I'm thinking that even if it was a bare chassis you'd have some problems. As the board material is high-resistance and rather than a direct path to ground you'd have voltage gradients all over the...
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    I too suffer from tinnitus - really badly in my...

    I too suffer from tinnitus - really badly in my right ear. I have ear defenders and earplugs all over the place and rehearsal rooms damaged my hearing so much that I had to give up live playing...
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    I built a hi-fi amp using this approach, but in...

    I built a hi-fi amp using this approach, but in the opposite direction. I chose a 1KV plate voltage and push-pull input driving a single-end output - the reverse of how everyone else does it. Lots of...
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    In-ear monitoring from the FX send

    I have a customer with tinnitus who wants to use in-ear monitoring to cut down the rest of the band but still hear his own guitar during rehearsals and small venues where no desk is being used - just...
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    My apologies - I mentally skipped the bit about...

    My apologies - I mentally skipped the bit about the output transformer. Doing things the hard way certainly has a novelty appeal.
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    I would rethink the design. There are many...

    I would rethink the design. There are many reasons why SS amplifiers use higher voltages. 12v at 100A to provide 2x100W output suggests a very inefficient path to take that will require a lot of...
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    Nice to be back.

    Nice to be back.
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    181

    Its a regular AB amp with just +/- 70v rails....

    Its a regular AB amp with just +/- 70v rails. It's impressive how compact it is - really neat. But this goes against it when troubleshooting.
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    Phil Jones Bass M-500 power amp

    Does anyone have a schematic for the Power amp board for a PJB M-500? I'm finding this to be troublesome to work on due to part of the board being obscured by a heatsink and it's difficult to see...
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    Just illustrating the commercial approach and...

    Just illustrating the commercial approach and wishing I'd never bothered to post anything on the subject.
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    4,788

    1. He isn't building a circuit from zero. 2. I...

    1. He isn't building a circuit from zero.
    2. I have never, anywhere, advised him to work on the limit - those are your words, not mine. In fact, I advised him on sizing for a transformer that will...
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    4,788

    It's interesting to see how components in...

    It's interesting to see how components in mass-produced, commercial designs are run at or close to their maximum rating - including voltage regulators. So we see 15v supply rails with 16v caps, power...
  13. The pine Tele pictures are lifted off Fender...

    The pine Tele pictures are lifted off Fender promotional material. Exactly the same guitar can be seen here;...
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    4,788

    I may be wrong, but I would have though that an...

    I may be wrong, but I would have though that an audio circuit powered this way would be subject to switching noise - like having a light dimmer in the same enclosure.
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    There are quite a few SMPS supplies that will...

    There are quite a few SMPS supplies that will float the output at about 60v-80v with reference to mains earth - enough for some people to get a shock or tingle, and common with some ungrounded laptop...
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    4,788

    When I'm sizing up for small PSUs using 78XX...

    When I'm sizing up for small PSUs using 78XX regulators I get the closest VA rating (higher rather than lower) to my maximum load and the closest AC voltage to my output voltage. Assuming 10%...
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    I'm against shotgunning, but if a part costs...

    I'm against shotgunning, but if a part costs pennies and is suspect I'll replace it as a matter of course to save time. When it comes to main filter caps, how old is the amp and are they leaking or...
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    On thought I had along the way when I was...

    On thought I had along the way when I was developing preamp circuits was if it would be feasible to take a hearing-aid board and adapt it for guitar use. They have low power requirements and many are...
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    Welcome to the forum. I'm with alexradium - the...

    Welcome to the forum. I'm with alexradium - the cap section immediately after R30 is probably shorting and this would also explain R36 burning. This resistor, in conjunction with the parallel cap...
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    I never said it sounded like a Les Paul - what I...

    I never said it sounded like a Les Paul - what I said was "Many of the players that used to take out a Tele and LP now just use their Tele and flip between active/passive." There are many aspects of...
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    That's what I wanted to get away from - most...

    That's what I wanted to get away from - most preamps I tried just gave more of the same with a top-end boost which was often harsh. One thing a Tele doesn't need is more top-end.
  22. The forward drop of an R3000 is definitely 1.5v...

    The forward drop of an R3000 is definitely 1.5v when tested with a DMM.
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    Does your output tube grid have a path to ground...

    Does your output tube grid have a path to ground via the trem circuit?
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    Many of the bass players I know use active...

    Many of the bass players I know use active electronics to increase the low-end when using older amps/speakers that have a roll-off that diminishes that low B fundamental on a 5-string or when using a...
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    The UV cure epoxy is polymerized with a UV torch...

    The UV cure epoxy is polymerized with a UV torch and is really tough. I have some used for tying fishing flies and it's available in different viscosities. You can use regular epoxy, though this...
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    Very often a transistor will check out OK with a...

    Very often a transistor will check out OK with a DMM. The instrument doesn't test the transistor under operating conditions and in any case if it's working but noisy you won't 'see' the noise with...
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    I use all kinds of Cyanoacylate for work-holding...

    I use all kinds of Cyanoacylate for work-holding in the lathe and miller. Strong enough when cold but easily separated when warmed up. I have my doubts that it would hold a pad where a component gets...
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    Often pads become loose with power components...

    Often pads become loose with power components such as dropper resistors or zeners and if there's enough room I insert a 1.5mm tubular brass eyelet and solder in the component. Sometimes the edge of...
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