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  1. Replies
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    I once saw a tube pin aligner in an old magazine...

    I once saw a tube pin aligner in an old magazine ad where you placed the pins something that looked like a ZIF socket. You squeezed the handles and every pin got straightened. The same company also...
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    I don't know about the one in the link, but some...

    I don't know about the one in the link, but some of the LED power supplies - 'electronic transformers' - can couple a lot of radiated noise into the preamp. Most are a crude SMPS in a plastic housing...
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    There's no 12vDC but you could use the 23V...

    There's no 12vDC but you could use the 23V supply, divide the LED strips and run them in series. Some of these strips can draw a fair amount of current - so think about the loading.
    ...
  4. Agreed. The OP measured 3v, but I was...

    Agreed.

    The OP measured 3v, but I was expecting maybe 80v there. It's common to get a tingle off an ungrounded Macbook - some perceive it as a mild shock but this one sounds more severe. A DMM...
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    Thanks for posting the pics. Quite educational...

    Thanks for posting the pics. Quite educational and I wasn't expecting it to be so traditionally constructed. I guess there's a burn right through the first wrap of paper to the core.
  6. I've seen a few teardowns of aftermarket units...

    I've seen a few teardowns of aftermarket units and it looks like they leave the ground pin unconnected on many of them. You need two things - a connected ground pin inside the adapter, and the...
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    Do you know if they're wound on a paper wrap over...

    Do you know if they're wound on a paper wrap over the core?
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    I'd be wanting to take the end bells off to take...

    I'd be wanting to take the end bells off to take a look at the construction and potential failure mode. Its a poor situation that a relatively modern Fender transformer would be able to short to the...
  9. They sometimes have way more tension than I like....

    They sometimes have way more tension than I like. I gently pull upwards on the cap with the tube removed to 'excercise' and stretch the spring just a little. Don't overdo it otherwise it will be too...
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    Doesn't D1 clamp R4 voltage to 0.7v?

    Doesn't D1 clamp R4 voltage to 0.7v?
  11. For me, I'd install a MOSFET B+ dropper and that...

    For me, I'd install a MOSFET B+ dropper and that would take care of the rest of the voltages at the same time and give the whole amp an easier life. You can tailor exactly the right B+ you want.
  12. I don't see your plate voltage in the screen...

    I don't see your plate voltage in the screen shot. Try the Weber bias calculator and see if that ties in. I plugged in your original B+ and the rest of your values and it does look rather high at...
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    That's the one I have. I got it maybe when they...

    That's the one I have. I got it maybe when they first became available in the UK and wasn't expecting much but I've been really pleased with the performance. Mine originally had a heat-resistant...
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    A few years ago I was in a research post and lead...

    A few years ago I was in a research post and lead officer assessing the likely impact of Avian Influenza, which was seen at the time as as having a high likelihood of becoming a pandemic with high...
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    There's no way of knowing though how many people...

    There's no way of knowing though how many people have become infected, but show only mild symptoms and don't seek medical assistance. It could take a longer time to establish the true mortality rate...
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    The deaths numbers though are skewed by the...

    The deaths numbers though are skewed by the underlying mortality rate of the population group. That is, those people who would have died anyhow. The death rate in China is roughly 7.5 people per 1000...
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    One of the crap jobs is to remove a 3PDT switch...

    One of the crap jobs is to remove a 3PDT switch that's a press-fit in a double sided PCB before being soldered in with unleaded.
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    My thought with repairing an amp is to repair it,...

    My thought with repairing an amp is to repair it, not modify it along the way. Say you add capacitance and the rectifier fails - then you don't know if the added capacitance stressed the rectifier,...
  19. I wouldn't replace a component with one of a...

    I wouldn't replace a component with one of a different value just because it maybe looks wrong as the amp could have been running with this value for decades. If it's in a dropper string then 22k...
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    Sorry - I transposed the digits - I;ve edited my...

    Sorry - I transposed the digits - I;ve edited my post and the part you've quoted is correct.

    Set your DMM to diode mode as a more reliable way to test the transistor;
    ...
  21. Can you post some pictures of the adapter and...

    Can you post some pictures of the adapter and lead? A tingle is normal with an ungrounded Macbook, but a shock or tripping of the breaker is not normal at all. The problem with aftermarket power...
  22. I'm not clear - do you have two different...

    I'm not clear - do you have two different adaptors? you mentioned magsafe (macsafe) as well as a no-brand replacement.

    When you said you used the Magsafe adapter with a 3-pin outlet, did you use...
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    Dave Green at Ashdown recommends replacing the...

    Dave Green at Ashdown recommends replacing the 2SA1695 with 2SA1294, and the 2SC4468 with 2SC3263 in these amps whenever the originals short. While the amp is without its output transistors it's also...
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    His last activity here was in 2013, so he's...

    His last activity here was in 2013, so he's perhaps unlikely to see your request. Maybe try a P.M. and see if that gets to him.
  25. Is your power supply a genuine Magsafe? If not,...

    Is your power supply a genuine Magsafe? If not, what is it?
  26. Why not relocate the FET to the grid?

    Why not relocate the FET to the grid?
  27. I use something similar called Tectyl to prevent...

    I use something similar called Tectyl to prevent winter salt corrosion on cars and bikes, and some other outdoor stuff prone to rain exposure or workshop equipment subject to condensation.
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    Check the screw terminals on the boards - they...

    Check the screw terminals on the boards - they come loose after a while. The input and output level pots get really flaky - check these. A fried transistor stays fried and won't cut in or out with...
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