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    Make sure your meter is in diode test mode as you...

    Make sure your meter is in diode test mode as you won't get a sensible reading with anything else. If your meter works fine with a single diode then it should work with a bridge as you're just...
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    I have a software-based tester that does a...

    I have a software-based tester that does a slightly better job of measuring cap parameters, better than my Fluke tester and dedicated LCR tester under most conditions. The problem with most...
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    Just to be sure on terminology, do not confuse...

    Just to be sure on terminology, do not confuse ground with negative when looking at caps. The 40+20+20 negative terminal is not a ground - it connects to the +ve terminal of C20 70uf section and the...
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    My own view on this is the original designer...

    My own view on this is the original designer probably left them that way for a reason - maybe it added another step in manufacturing that wasn't necessary. It's a low-gain amp and not critical. when...
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    +1. That works just fine.

    +1.

    That works just fine.
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    If the case is ABS then epoxy will not give you a...

    If the case is ABS then epoxy will not give you a strong bond. I've done some trials with Araldite Rapid, Araldite Standard (24hr) and JB weld. None of the bonds equal the strength of the parent...
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    It's also useful to remember that old caps had a...

    It's also useful to remember that old caps had a very wide tolerance. -20%/+80% were common. I see a lot of old caps that read high compared to their nominal value.
  8. Caps have followed the path of many electronic...

    Caps have followed the path of many electronic components in getting smaller along with increased performance. The physical size and lead diameter of pretty much everything is reduced. I have no...
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    A sound guy once said to me that the only talent...

    A sound guy once said to me that the only talent a bass player has is the ability to turn an amp up whilst making it look like its being turned down.
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    Soldered-in can caps can be difficult. I have a...

    Soldered-in can caps can be difficult. I have a very large iron for those jobs that takes 1/2 hour to come up to temperature and has a massive copper bit. Unless the can is being replaced I find it...
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    Can't remember how old I was, but the same thing...

    Can't remember how old I was, but the same thing happened to me.
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    I've recapped a few Traynors, including my own...

    I've recapped a few Traynors, including my own YBA-1A II (since sold). I've never had to mod the grounding and after recapping the amps have all had far less hum (they all had the original stick of...
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    I've also replaced a fair number of speakers with...

    I've also replaced a fair number of speakers with the same frame stamping as the MG series, though not branded MG. Identical construction in every other respect and branded Celestion. Maybe these are...
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    The headphones don't cut off the speakers with...

    The headphones don't cut off the speakers with this amp - the master volume has to be turned to zero for silent practice. The first thing I do with any amp is to establish that the DC voltages are...
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    Now wouldn't that be a fine product? A beer-based...

    Now wouldn't that be a fine product? A beer-based contact cleaner. One squirt for the amp, 10 for the guy dong the repair. In case anyone reading this isn't familiar, IPA = India Pale Ale.
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    Actually I was doing Marshall a disservice as...

    Actually I was doing Marshall a disservice as there were a good few from Blackstar amps. Speakers mainly G12T and 70/80. Some "MG" labelled - certainly two taken from fairly late Marshall MG combo...
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    That's the way to go.

    That's the way to go.
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    I had a customer who early this year imported...

    I had a customer who early this year imported 4x6L6 NOS RCA black plate tubes from the USA. Glad he bought them - after just two weeks one shorted out and another became microphonic. Replaced with a...
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    It comes down to the combination of plastic,...

    It comes down to the combination of plastic, solvent and also how the part stresses - either from cooling during manufacturing or during use. I've seen this a lot with motorcycle tail light and...
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    Even when run within their rated power I find...

    Even when run within their rated power I find that many modern speakers will fail through thermal problems. I've just taken a load of the manufacturer-fitted low-end Chinese Celestions for scrap. I...
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    You use it on tube amps?

    You use it on tube amps?
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    Not without removing the voice coil and carrying...

    Not without removing the voice coil and carrying out measurements on the wire gauge and construction. A few years ago I had a 6" speaker rated at 600W RMS that had failed. Massively inefficient and...
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    At one time a scope was a super-expensive and...

    At one time a scope was a super-expensive and bulky item and just too costly for many repair shops. My first scope, a Cossor, weighed about 150 pounds and came with its own trolley. It took up the...
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    Agreed, If the board is faulty, then here in the...

    Agreed, If the board is faulty, then here in the UK it's a better cost option than spending too long on a defective one and it has a better long-term prospect. I've had good success with repairing...
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    Maybe the hum is down to the increased current...

    Maybe the hum is down to the increased current draw on the power tubes as the bias is shifting. Scoping the output tubes should show any oscillation. If there was any DC leakage through the coupling...
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    Does your trem sound like the one here? ...

    Does your trem sound like the one here?

    https://www.youtube.com/watch?v=xMY5g2SB910

    Some Guyatone amps were rebranded by Selmer in the UK as Futurama.
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    With the reduced PT load with just a pair of...

    With the reduced PT load with just a pair of tubes and the previously mentioned increase in B+ my choice for a pair of tubes would be KT88, which has better figures than the 6550
  28. I did a repair on a radiogram amp from maybe the...

    I did a repair on a radiogram amp from maybe the late 50s/early 60s that was built in a similar fashion. That particular amp was PCB construction. It had holes in the board to mount regular tube...
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