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  1. I recently did a rewind for a guy who'd damaged...

    I recently did a rewind for a guy who'd damaged the winding of a brand-new Tele neck pickup. So I got a call then saying he'd damaged the newly rewound pickup by breaking off the head of the screw,...
  2. +1 on using a Scotchbrite pad

    +1 on using a Scotchbrite pad
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    Sometimes the spring can be shortened a little to...

    Sometimes the spring can be shortened a little to give more tension and a coil bent over to form a new loop There are lots of cheap models around, but I still see Luxo models that have endured years...
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    Keyboard for daughter? That doesn't seem like a...

    Keyboard for daughter? That doesn't seem like a fair swap. I'd want nosaj's bicycle thrown in as well, so long as really did have bells and whistles.
  5. The noise is most likely a bad joint. Bad caps...

    The noise is most likely a bad joint. Bad caps will cause hum and other symptoms. Did you resolder the tube bases as cracking is very common? Rather than replacing parts right now, try to determine...
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    I'm with Rhodesplyr on this one. A cap with a bad...

    I'm with Rhodesplyr on this one. A cap with a bad terminal rivet will show up as having low leakage, but be useless in service. A cap tested with 9v may show low leakage but that could be a different...
  7. I see more of this series of amps (Hotrod/Blues...

    I see more of this series of amps (Hotrod/Blues and Deville) than any other. Probably 9 times out of 10 if it has the grey Illinois caps there will be crusty residue around the + terminals of the...
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    Many autotransformers in the UK are for 230v and...

    Many autotransformers in the UK are for 230v and give an even higher output. Also, some are not fused and have very thin windings. An autotransformer will dump a lot of current and if the mains plug...
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    I don't think any check with a 9v battery is...

    I don't think any check with a 9v battery is going to give a verdict on whether the cap is good or bad. Any diagnosis needs to be made at the working voltage. Are they NOS?
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    Ammonium Hydroxide in the form of household...

    Ammonium Hydroxide in the form of household ammonia is a good cleaner for brass and nickel. I keep .880 ammonia in stock to dilute for some cleaning jobs and most horological cleaning solutions are...
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    Does the guitar do this with the volume turned to...

    Does the guitar do this with the volume turned to zero? Check the grounding to make sure the socket is connected up OK and there are no wires loose anywhere or any shorts - especially check the 'hot'...
  12. The '57 spec sheet gives 3v output (string) 4.5v...

    The '57 spec sheet gives 3v output (string) 4.5v output (strum). No wonder it breaks up.
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    Welcome to the forum. Is this a new build or an...

    Welcome to the forum. Is this a new build or an existing guitar that's developed a fault? It looks to me that you may have the hot and ground connection reversed - maybe at the output socket.
  14. You've got a lot of bubbling rust there where...

    You've got a lot of bubbling rust there where moisture has crept under the nickel and pushed it away from the steel. To properly remove the rust you'll remove a lot of the nickel as well, which isn't...
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    The bands I deal with either hire something over...

    The bands I deal with either hire something over here, or bring a range of different transformers to suit their setup - usually a portable transformer with a handle on top and sized just enough for...
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    The pitfall is if you use an auto transformer -...

    The pitfall is if you use an auto transformer - these are not isolated. The building site transformers are fine and offer isolated protection but are overkill for amp use. You have to watch the...
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    I was taking a class on CRT repair and the first...

    I was taking a class on CRT repair and the first day was to cover safety issues. I said one thing you never do is lift the anode cap and touch it without first discharging the circuit. One guy wanted...
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    For a long time the tolerance on can-type...

    For a long time the tolerance on can-type elecrolytics in the UK was +80/-20%. Measuring capacitance value doesn't mean much unless taken into consideration with other parameters.
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    Yes - that;s right. What I'm not understanding...

    Yes - that;s right.

    What I'm not understanding is the parallels with a condenser mic input where there can be quite a small source capacitance (as little as 6pf) and large (220M to 5G Ohm) input...
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    The disc is unknown and part of a circuit I...

    The disc is unknown and part of a circuit I experimented with a very long time ago. It measures 80pf and is bonded to a thick aluminium disk and encapsulated with epoxy. The entire thing is 18mm...
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    I was thinking about where you have an input...

    I was thinking about where you have an input buffer where the bias network appears in parallel with the source impedance (in this case a piezo disk)
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    TL072 bias resistor/input impedance

    With a typical 9v single-rail supply you may have a couple of bypassed 100K Ohm resistors connected to the supply and their node feeding the 4.5v input bias via a 1M Ohm resistor, which effectively...
  23. Whether it cracks depends on the bend radius...

    Whether it cracks depends on the bend radius compared to the thickness, as well as the state of hardness of the sheet (and of course, the alloy). Much of the sheet is supplied 'half hard'. You can...
  24. Aluminium is fine for a chassis but it needs to...

    Aluminium is fine for a chassis but it needs to be thick enough. I have my own folding machine and use 1.8mm and haven't had any issues over the years. Peavey used an aluminium chassis for their...
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    That looks like a mercury commutator - now banned...

    That looks like a mercury commutator - now banned in the EU at least along with everything else that contains mercury. I've often thought of adding a Leslie-type speaker to my list of projects. One...
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    Kirchoff's first, then you can have your...

    Kirchoff's first, then you can have your bikinis. How can you have any pudding if you don't eat yer meat?
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    I spent a good deal of time using Kirchoff's, but...

    I spent a good deal of time using Kirchoff's, but I can't ever think of a single instance where I've had to use the principles in a practical situation. I'm always reminded of how valuable a teacher...
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    I can maybe see what HaroldBrooks is getting at -...

    I can maybe see what HaroldBrooks is getting at - It takes me back to my college days and hacking through Kirchoff's law which is used to analyze circuits where there may be multiple interconnected...
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