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  1. Replies
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    Sure, use a fingertip. ANy of them getting hot?

    Sure, use a fingertip. ANy of them getting hot?
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    C40 is in parallel with D13. By measuring across...

    C40 is in parallel with D13. By measuring across D13, you are also measuring across C40. Look at the schematic.

    Any chance D13 is in backwards? The cathode - the lined end - is the end NOT...
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    I think it cute the TP calls it 17v, but the...

    I think it cute the TP calls it 17v, but the schematic calls it 16v. I generally refer to these as 15v rails anyway. Point is your +15/16/17v is missing. Until that is restored, nothing that uses...
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    It is a switch, it turns on Q2 to bring +55v into...

    It is a switch, it turns on Q2 to bring +55v into the circuit to enable it. It is a power up mute circuit. There is +55v on the collector of Q2, so that whole circuit is working.
  5. Consider that that 1v pp is a peak number for...

    Consider that that 1v pp is a peak number for your pickup - the hard attack. if it clips, it only clips that attack. if you input a sine wave at that level, it is as if your guitar was permanently...
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    Eye on the prize, we are looking for what is...

    Eye on the prize, we are looking for what is blowing the fuse. If pulling the power tubes didn't help, we want to check flyback diodes, which are CR4 and CR6 on the schematic. Those are wired from...
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    I have a good meter, and want one around. But...

    I have a good meter, and want one around. But having said that, MOST of the time an accurate reading is not the issue. I usually don't have to worry if the 15v rail is 15.1 or 14.9 volts. What I...
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    10 gig ohms? Isn't that just... the air?

    10 gig ohms? Isn't that just... the air?
  9. Replies
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    But really, you have the HP unit, why not take a...

    But really, you have the HP unit, why not take a moment and complete the instrument? Make up a cord with 1/4" male on one end and a connector to match the HP on the other. In your case a dual...
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    But you can test them for shorts without pulling...

    But you can test them for shorts without pulling the boards, just probe via the tube socket pins.
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    So the problem we are trying to solve is that the...

    So the problem we are trying to solve is that the customer saw flashes of light?

    On your bench, are there any performance problems you can detect?
  12. Thread: Earning my supper

    by Enzo
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    Earning my supper

    A lot of talk lately about quid pro quo. Well it came home to roost. A friend invited me and the wife over for dinner. We had pizza. This is the guy I have been trying to teach the black arts of...
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    I automatically resolder the power tube socket...

    I automatically resolder the power tube socket pins on those. And I agree to check pins 1 and 6 on the phase inverter for missing B+.
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    Agree, and it doesn't have to be loud to do it.

    Agree, and it doesn't have to be loud to do it.
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    What about them, they seem to be working. Q8 is...

    What about them, they seem to be working. Q8 is still a prime suspect.
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    Well I would have replaced the four power tubes...

    Well I would have replaced the four power tubes before replacing caps. Your blown high voltage fuse wants to agree with me. Pull those tubes, does it still blow the fuse?

    Alternately possible...
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    Clamato is revolting enough on its own, why ruin...

    Clamato is revolting enough on its own, why ruin perfectly good tomato juice? But what it REALLY nauseating is "Bud Light with Clamato". Yes, you can buy cans of beer with clamato already mixed...
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    Over here, plastic sporks are common in take-out...

    Over here, plastic sporks are common in take-out food. You can use it for either utensil, and the restaurant only need to put one utensil in your purchase. TO be honest, I prefer one over...
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    Sporks will fly...

    Sporks will fly...
  20. Thread: Gibson GA45RVT

    by Enzo
    Replies
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    Voltages look real close. Those are 5w and 7w...

    Voltages look real close. Those are 5w and 7w resistors for a reason, expect them to warm up.
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    Pretty sure you have your B and C readings...

    Pretty sure you have your B and C readings reversed on Q6,Q7. Clearly B of Q8 and C of Q7 MUST be the same, they are wired together.

    Check Q7,8.
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    With no load, DC on the output won't draw excess...

    With no load, DC on the output won't draw excess current. But put a load on it and voila, bright bulb. Bias shouldn't affect DC on output. So work with NO load for now.

    Q5 is the bias...
  23. Thread: Gibson GA45RVT

    by Enzo
    Replies
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    260

    So R57 is not?

    So R57 is not?
  24. Thread: Gibson GA45RVT

    by Enzo
    Replies
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    DO they still get hot in standby mode? V7 is a...

    DO they still get hot in standby mode?

    V7 is a 0A2 glow tube. It is the tube equivalent of a zener diode. 150v. If it is shorted, those resistors would burn. Make sure that is the type tube...
  25. Thread: Gibson GA45RVT

    by Enzo
    Replies
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    Um, those sound interesting, I wonder where they...

    Um, those sound interesting, I wonder where they might be in the circuit. If only we had a schematic...
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    Plunk your magic twanger, froggy. ...

    Plunk your magic twanger, froggy.


    https://www.youtube.com/watch?v=YYZazW9Ja1k
  27. Thread: Toaster oven

    by Enzo
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    You didn't like what he said at your wedding?

    You didn't like what he said at your wedding?
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    They are all so similar, most of the time, at...

    They are all so similar, most of the time, at least for light work, the "wrong" driver will work. And threads are threads, so a 3mm one type will replace a 3mm of another. SOmetimes I find a...
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