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  1. Replies
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    Echoing nickb's suggestion, since you know that...

    Echoing nickb's suggestion, since you know that the speaker is good I would run the amplifier output to an external cabinet. If the problem goes away when the vibration is isolated from the amp the...
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    One end is wiper, one end is track. Orientation...

    One end is wiper, one end is track. Orientation shouldn't matter. I would use a linear pot and not a log taper one.
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    Good point.

    Good point.
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    I think it should be like this, but not...

    I think it should be like this, but not necessarily these values. If the wiper open up then the bias voltage goes to the full negative supply or coldest possible bias.

    55527
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    I'm really liking some of the quirks on this...

    I'm really liking some of the quirks on this guitar, but there are some drawbacks too. It has a great sound unplugged, the Mustang-ish bridge/trem acts as a resonance chamber. I think balancing the...
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    What the heck is this guitar?

    Bought the weirdest guitar today for $50 from a pawnshop. It was cheap because it has a broken tuner and is so strange. Guy said it had been sitting in the back for about 15 years. All the hardware...
  7. OK, this is just my opinion, but this seems like...

    OK, this is just my opinion, but this seems like a lot of work to hear the difference between two almost identical amps, which you have said doesn't seem to show any difference when recorded.
  8. Yes, that is what I was thinking. You could also...

    Yes, that is what I was thinking. You could also use a 4PDT switch so that the "grounds" are also switched between the speaker and the dummy load.
  9. Asking because I don't know, but do you need to...

    Asking because I don't know, but do you need to be concerned for a situation where you get a speaker cable wired backwards and would then be sending one amps hot output to ground through the other...
  10. I am lazy. I would use a stereo 212 or 412...

    I am lazy. I would use a stereo 212 or 412 cabinet with one amp hooked to each side of the cab, then just A/B switch to the amps inputs. Use two mics (one on each side) and either record both or mix...
  11. I usually use my phone as well, or I have an old...

    I usually use my phone as well, or I have an old android tablet. If I had to I would just get a $5 thrift store android phone to dedicate to being a generator, or if you have an old one with crappy...
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    I know that musical signals are different than an...

    I know that musical signals are different than an AC line or whatever, but have always been surprised, especially on high power amps, that they would even have 1/4" speakers outs with the "hot 2"...
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    I've found ICEPOWER modules to be somewhat...

    I've found ICEPOWER modules to be somewhat sensitive to any load that looks like a capacitor.
  14. Great, now we have to get into the tube vs. solid...

    Great, now we have to get into the tube vs. solid state thing... :)
  15. Does it have an actual connector on the LCD, or...

    Does it have an actual connector on the LCD, or is it more of a permanent connection? I remember on a Saab my wife had the display for the radio had lines like this, and it was a known issue that...
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    I am working on a C50 right now and I swear at it...

    I am working on a C50 right now and I swear at it every time I need to do anything. What a stupid mechanical design.
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    I've used a Black and Decker leak...

    I've used a Black and Decker leak detector/thermal scanner, which is basically an infrared thermometer with a light added that changes colors as you sweep it over cold or hot areas. It isn't the...
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    Tech21 is VERY protective of their schematics....

    Tech21 is VERY protective of their schematics. They do not give them out. They will however talk you through stuff. I was working on a TM60 and ended up talking to guy who designed it for like an...
  19. Thread: Plush amplifer

    by glebert
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    I have one sitting here if the OP needs more...

    I have one sitting here if the OP needs more info. I need to work on it anyway.
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    If you use a brass nut or zero fret the strings...

    If you use a brass nut or zero fret the strings will have a metal connection to each other, so only one ground wire (to one of the saddles) needed. Could also put a metal plate underneath the saddles.
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    You could do individual saddles. Something like...

    You could do individual saddles. Something like this. https://www.bitterrootguitars.com/Bass-Bridge-single-string-black-individual-p/122010bk.htm These are 16mm wide, so that would be your minimum...
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    It's possible to make bridges of different widths...

    It's possible to make bridges of different widths and spacings. What is your neck width?
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    I was thinking it would be cool to make a type of...

    I was thinking it would be cool to make a type of electrical stethoscope with a probe and piezo headphones.
  24. Thread: HartKe B600

    by glebert
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    Looks like a pretty uncomplicated amp. If you...

    Looks like a pretty uncomplicated amp. If you can't find a schematic you may be able to fix it just by checking the "big stuff" like voltage rails for output devices and preamp ICs. If those look...
  25. Thread: HartKe B600

    by glebert
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    I think the B600 is an older 60W amp that has...

    I think the B600 is an older 60W amp that has been discontinued. Don't think it is SMPS.
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    Excellent point, I will keep that in mind. My...

    Excellent point, I will keep that in mind. My first option would probably be a pair of 6550/KT88s.
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    From what I have read the JJ 6L6GCs are good for...

    From what I have read the JJ 6L6GCs are good for these high voltages. I think Music Man amps run the plates up at least this high.

    Here is the schematic.55089 E300T and WTB300V are almost exactly...
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    Output transformer max voltage?

    Hopefully not too dumb a question, but I have an Eden E300T with bad OT. There is no replacement part available from Eden. Something like an SVT or Hammond OT is over $300. I am wondering if I can...
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