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  1. Replies
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    From a practical perspective when I've invested a...

    From a practical perspective when I've invested a lot of time and materials into a one-off build and want to be certain that I don't make a mistake I use a dummy setup just to locate everything. ...
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    In the diagram there is no voltage divider...

    In the diagram there is no voltage divider action. The only change is to the effective resistance value as seen when measured across R26. Now, consider if the bottom end of R26 was grounded and there...
  3. I suspect with thermal fuses that some cheaper...

    I suspect with thermal fuses that some cheaper types operate if subjected to long periods of heat that's marginally below their nominal operating temperature, or if they're subjected to transient...
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    It also appears from the pics that you have the ...

    It also appears from the pics that you have the screened leads grounded at both ends - is this the case?
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    Take a look here for calculations to give a...

    Take a look here for calculations to give a better insight into the actual values involved;

    https://www.liutaiomottola.com/formulae/compensation.htm
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    I have scoped amps to see how biasing affects...

    I have scoped amps to see how biasing affects output level and for the ones I've checked the difference is very slight - too small in my opinion to make any difference within the normal range of...
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    I always bias on the cool side to prolong tube...

    I always bias on the cool side to prolong tube life and when amps go out they get played and everyone is happy. Given the price of tubes in the UK and the short warranty I don't think anyone would...
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    I don't, but I'm keeping a lookout for any more...

    I don't, but I'm keeping a lookout for any more of these if they turn up cheaply enough. I'll you know if I happen across a display.
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    I had one with flexible tips in the '80s and the...

    I had one with flexible tips in the '80s and the same tip lasted for years of frequent use, but I've not seen them for sale since then.
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    Or use the 'neon trick' to check to OT.

    Or use the 'neon trick' to check to OT.
  11. I wonder if the sound is a beat frequency caused...

    I wonder if the sound is a beat frequency caused by PSU ripple (due to increased current draw) and imperfect cancellation in the OT.
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    I think there's enough angular movement to...

    I think there's enough angular movement to accommodate thinning out the saddles. It looks to be just the E saddles that need adjusting and there ought be enough movement in the rest. I'll ask the...
  13. I've had Blues Juniors where even hand proximity...

    I've had Blues Juniors where even hand proximity will cause oscillation. The 100pf cap in parallel with R30 (cream board models) is a good and certain fix, though I don't know what the resistor...
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    Those Gossen meters that dmeek posted look superb...

    Those Gossen meters that dmeek posted look superb - I want one of each. I've just taken a look a the rest of the range and they have some really nice equipment and it's interesting that high-end...
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    I don't know the story behind this particular...

    I don't know the story behind this particular guitar - it is out of keeping with all the others she owns. Machining the saddles crossed my mind as being the only other viable fix. I always think of a...
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    I like a fairly high action myself, but this...

    I like a fairly high action myself, but this particular player has all her guitars set very low - light strings, small hands and a very light touch so she gets away with it.
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    I use a set of feeler gauges at the 12th fret as...

    I use a set of feeler gauges at the 12th fret as my preferred method, though I also have a digital vernier as well as a string height gauge.
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    PRS USA Custom 24 action height

    I've run into an issue with this particular guitar and wonder who else has found the same thing in that the lowest action height achievable is 0.062" across all strings. It was originally much higher...
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    Interesting you should mention Micronta. In the...

    Interesting you should mention Micronta. In the 70s I bought a Micronta auto ranging DMM that was an eye-watering price at the time here in the UK. Made in Japan and a delight to use. I was really...
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    Most tube testers won't tell you if a tube is...

    Most tube testers won't tell you if a tube is microphonic or prone to oscillation due to internal mechanical problems. A tube tester also won't provide any form of positive feedback path that an...
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    Sometimes a proper analogue meter is more useful...

    Sometimes a proper analogue meter is more useful than a DMM for some jobs. I thinned mine out to leave a nice little Taylor. The large AVO meters went a few years a go as they're just a little bit...
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    Yes, we need the schematic so we know exactly...

    Yes, we need the schematic so we know exactly which model we're discussing.
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    I like my Fluke model 11 and 12. The downside is...

    I like my Fluke model 11 and 12. The downside is neither measures current - rather an oversight on Fluke's part. I like how it switches to voltage measurement if you have it on the resistance scale...
  24. I have an old populated board from Maplin that...

    I have an old populated board from Maplin that uses the same IC - really versatile.

    There's a cheap XR2206 based generator widely available quite cheaply;
    ...
  25. My go-to audio oscillator is one I built over 40...

    My go-to audio oscillator is one I built over 40 years ago. I think it has about 6 parts built on Vero. Capacitor-coupled output, so protected against DC. It will do 1v p-p max and has pencil marks...
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    An internal short on any of the windings will...

    An internal short on any of the windings will cause excessive current draw, whether or not any load is connected. Usually the mains fuse will blow. Humming can be down to a number of reasons - high...
  27. The sag resistor is the easier way to achieve...

    The sag resistor is the easier way to achieve some compression. The problem with sag is that it depends on the power amp drawing enough current for it to be noticeable. There's a trade-off in that a...
  28. Here's my thoughts on the points in bold; 4....

    Here's my thoughts on the points in bold;

    4. Higher-quality suggest there's something inferior or deficient with the original caps. Is this down to perception or have you looked at specs or taken...
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