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  1. Replies
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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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    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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    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...
  4. 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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    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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    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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    4,487

    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.
  13. 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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    That's a fascinating input circuit. I'm glad I...

    That's a fascinating input circuit. I'm glad I opened the theory of operation PDF and never would have remotely thought a 50s jukebox would be anything other than a signal amplifier. That's an...
  21. Out of interest I bought one of these; ...

    Out of interest I bought one of these;
    ...
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    Guitar amps often run higher plate/screen...

    Guitar amps often run higher plate/screen voltages on tubes when compared to the spec sheets. Those figures were determined to give the best service life and reliability for the tubes in a wide-range...
  23. I've come across this mod but different people do...

    I've come across this mod but different people do it in different ways - if you could explain exactly what you did it may give a clearer picture. The mods themselves may not be the cause, but you...
  24. Thread: Now what?

    by Mick Bailey
    Replies
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    I used to watch a stranger who regularly took the...

    I used to watch a stranger who regularly took the same bus to work. I found her to be mysterious and erotic. One day I gave her a gift - a sculpture I made of her from my own faeces and some teeth I...
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    There's a safety consideration for yourself and...

    There's a safety consideration for yourself and another for the circuit you're working on. As this amp is powered from an isolated DC low-voltage power supply then there's a much lower risk of shock...
  26. A low-frequency oscillation suggests to me...

    A low-frequency oscillation suggests to me something involving the larger value caps and my first check is to ensure the supply nodes are being decoupled correctly. Did the amp oscillate before you...
  27. I'm not convinced. An arc will still develop if...

    I'm not convinced. An arc will still develop if the voltage is sufficient and then the capacitor actually intensifies the arc by causing an oscillatory circuit and can reach a much higher,...
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    An amp can't be made any more reliable than its...

    An amp can't be made any more reliable than its tubes - that's how I ended up using SS amps for live work. You have to be an optimist if you run tubes.
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