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  1. Could be a bad glue joint. I had a Leslie that...

    Could be a bad glue joint. I had a Leslie that buzzed - I got a bottle of Stewmac Thin Superglue and loaded all of the cabinet joints with it. No more buzz. A couple of years later I got another...
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    BGW had it figured out in the 70s: The component...

    BGW had it figured out in the 70s: The component side and the solder side are one and the same. Piece of cake to service (so long as you don't have counterfeit output transistors).
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    According to the schematics I have, they are...

    According to the schematics I have, they are 2SC3264 in later ones, 2SD424 or 2SC3482 in older ones.
  4. Not in my experience. Every Twin we have (both...

    Not in my experience. Every Twin we have (both vintage and RI) can be run at any volume level without oscillation.
  5. I've worked on tons of Fender RIs that had open...

    I've worked on tons of Fender RIs that had open tank inputs. Never any damage to the reverb transformer (well, maybe one - I replaced a bad transformer over 10 years ago - but who knows if it was...
  6. While you are in there: I'll bet that the power...

    While you are in there: I'll bet that the power tube grid stoppers are on the board instead of the sockets. This works OK on the RI amps even with JJs, but not on the Tone Master, at least with JJs....
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    From my experience at home, it would seem that...

    From my experience at home, it would seem that long term exposure to an ozone generator can promote rust and cause some rubber-like compounds to break down.
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    Perhaps I missed something in the conversation...

    Perhaps I missed something in the conversation (short attention span): Shouldn't there be a filter cap from the junction of R7 and R9 to ground? As it sets, not only is the preamp on the same node...
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    While you are in there, check that the EL84s'...

    While you are in there, check that the EL84s' grid stoppers are on the tube sockets, not on the PCB. JJs can have stability (oscillation) issues when the stoppers are on the board. I've seen this...
  10. We started using SSE for quite a while. Always...

    We started using SSE for quite a while. Always good service. Some stuff we can get for less from the amp manufacturer, but SSE is faster to order from and they ship more quickly, so I get it from...
  11. Have some fun and experiment: With some amps, if...

    Have some fun and experiment: With some amps, if you connect the reverb send and return, the reverb circuit makes a fun parallel hi-gain stage.
  12. Try putting a 250k resistor across the pot.

    Try putting a 250k resistor across the pot.
  13. Look at the frequency spectrum of a square wave...

    Look at the frequency spectrum of a square wave instead of what it looks like on an oscilloscope. On a scope a perfect square wave and a pulsed battery look the same. But they are far from being...
  14. I was working backline - long story short, the...

    I was working backline - long story short, the guitar sounded awful, and we quickly determined that it was his FullTone cable, so I traded him. Back at the shop, the Fulltone measured 10k Ohms from...
  15. A square wave is comprised of a number of sine...

    A square wave is comprised of a number of sine waves. The speaker acts no differently. It's all about the amount of power fed to the speaker, not the waveform.
  16. If the plating was any good, you would not have...

    If the plating was any good, you would not have to be messing with the thing. I've seen gold jacks corrode too.
  17. How does the bias supply even work? C15 is in...

    How does the bias supply even work? C15 is in series, not in parallel. There should be no CD getting to R7 or beyond.
  18. I've always thought that the real issue with...

    I've always thought that the real issue with those - as well as "good jacks", is corrosion of the jack's sleeve. It's not a proper wiping contact or a pressure contact, it's a "hope it touches...
  19. Sometimes the connection of the wire to the Molex...

    Sometimes the connection of the wire to the Molex goes duff. Just chop the little buggers off and solder the leads directly to the pins. We've done it innumerable times.
  20. Thread: SVT parts

    by TimmyP1955
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    371

    We (day job) have a lot of SVTs. In 14 years I...

    We (day job) have a lot of SVTs. In 14 years I think I've had to replace two pots. If they are breaking, I believe it is human error. If you give him metal shafts, he may punch the backs out of...
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    Run the output of the bad channel into the input...

    Run the output of the bad channel into the input of the good channel with a polarity reversing cable. Monitor the output of the good channel. Set all external pots to "no effect" then adjust the...
  22. The latches on the latest B15s are very wimpy. ...

    The latches on the latest B15s are very wimpy. Wish I could figure out a substitute.

    Now I know what those funny clamps are that I've been looking at for the last 15 years.
  23. Guess you'll have to get them from Ampeg - once...

    Guess you'll have to get them from Ampeg - once the new parts department is all settled in.

    I expect you have figured out that they should be installed with the "wings" going side to side, so they...
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    Given that it clears up when the PT is powered...

    Given that it clears up when the PT is powered down, try swapping the rectifier tube (or if diodes, swap them if convenient).
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    There is no entry 21 :-)

    There is no entry 21 :-)
  26. Folks don't always use SVT heads with 4 Ohm or 2...

    Folks don't always use SVT heads with 4 Ohm or 2 Ohm loads as they should. We've had folks run them with 8 Ohm cabinets, which I think might sometimes make the amps unhappy.
  27. Turn the reverb control all the way down, connect...

    Turn the reverb control all the way down, connect the reverb send and return together, put a signal into the amp, and carefully turn up the reverb control. If it gets loud quickly, the send and...
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    Does the switch reverse Live and Neutral, or does...

    Does the switch reverse Live and Neutral, or does it switch which side of the mains that a death cap is connected to? If the latter, it might be wise to do away with that.
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