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    Is it this one? 58676 58677

    Is it this one?

    58676

    58677
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    If you have the transformer disconnected from...

    If you have the transformer disconnected from everything and the bulb still glows then the transformer has an internal short. I doubt you could get a replacement, and if you could it would cost more...
  3. I always get frustrated trying to figure out...

    I always get frustrated trying to figure out reasonable bias voltages because everyone says "you don't set a voltage, you set the bias based on current" and won't even give a range or a starting...
  4. That also explains the low voltage at pin 1. ...

    That also explains the low voltage at pin 1.



    If he designed it to have EL-34 it should be OK, the interchangeability issue AFAIK has to do with pin 1, which is N/C on 6L6 (but some people use...
  5. Yes, or I can put my 4 ohm resistor in parallel...

    Yes, or I can put my 4 ohm resistor in parallel with the internal speaker. I figured I'd sneak up on it a bit by doing 4||16 and 4|||8 first to see if it looked like it was trending right.
  6. Thinking out loud, but was wondering if I should...

    Thinking out loud, but was wondering if I should expect to see 5w coming out in the configuration I have it in. The amp has an jack for an external speaker which just in parallel, not a switchjack....
  7. Took some gut shots and power supply voltage...

    Took some gut shots and power supply voltage measurements. I have 375 VDC at first power supply node, 353 VDC at second, and 254 VDC at third. So the first two are above what is called out on the...
  8. After you reflow check for continuity between the...

    After you reflow check for continuity between the pins and next component. I had a HR Deville that had cracks in the traces themselves and had a gap right where the trace met the solder pad, and...
  9. 1962 Magnatone Custom 410 low output power, thumpy vibrato

    Working on a project amp I picked up a while ago. Generally works, but not getting the magic Magnatone sound I expect. This is supposed to be a 5 watt amp, most I can get out of it before serious...
  10. With 2V on the grid I think you are close to...

    With 2V on the grid I think you are close to saturation for the tube (which would happen at 0V diff between grid and cathode) so it will be drawing high current, so it makes sense that there is much...
  11. How can pin 3 and 8 have different voltages if...

    How can pin 3 and 8 have different voltages if they are directly connected? As far as the 2V grid voltage, maybe a leaky cap? Did you measure voltages with the tube out?
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    This is a frustration I have with Randall amps. I...

    This is a frustration I have with Randall amps. I am working on an RX120rh were the power amp is *almost* the same as the one posted above, but with a few more transistors and other components, and...
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    Next I would check voltages to see if you have...

    Next I would check voltages to see if you have the right (or at least reasonable) voltage rails for the power amp and preamp.
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    You replied back while I was adding something to...

    You replied back while I was adding something to my post, so putting it here instead.

    Assuming you have an effects loop try plugging your guitar directly into the effects return jack. See if you...
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    No offense, but are you sure that is a G3 and not...

    No offense, but are you sure that is a G3 and not a G2? I can't find any pictures of a G3 with front graphics that look like that. All the G3s I see have the G3 right under the switch. Then again...
  16. It is pretty complicated to shift the fundamental...

    It is pretty complicated to shift the fundamental frequency of a signal once it is already generated. Usually one would have to use something like a phase-lock-loop, at which point you are basically...
  17. I had good luck removing rust from a Hot Rod...

    I had good luck removing rust from a Hot Rod Deville control plate (chrome plated) using soapy water and 0000 steel wool. Might be hard to do with smaller bits and pieces.
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    I'm pretty sure these have parallel effects loop...

    I'm pretty sure these have parallel effects loop (if it is like my TSL head). My amp also has no sound (I got it as a fixer project). The problem with mine seems to be the output transformer having...
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    No, this doesn't require the footswitch for...

    No, this doesn't require the footswitch for reverb.
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    Well, it is a pretty loud amp. ;) In addition...

    Well, it is a pretty loud amp. ;)

    In addition to what the Dude said, I would also see if you get a clang out of the speaker when you tap on the reverb tank (amp on and reverb up obviously). You...
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    Update on this and two more silly questions....

    Update on this and two more silly questions. Extended the wire, cased it in heat shrink, and did a test with only two power tubes and a 16 ohm speaker and it worked good. Did have to reverse the...
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    I think we are talking about different things,...

    I think we are talking about different things, but you helped me figure out the BOM issue. The BOM is only for the power amp module. The C15 that I am talking about is in the preamp, which is the...
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    OK, pretty sure I figure it out, and I am just...

    OK, pretty sure I figure it out, and I am just ignorant. I think what I was seeing wasn't so much a bass rolloff as it was a treble boost, which might be part of the "SWR sound". That combined with a...
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    Just realized it probaby can't be a problem with...

    Just realized it probaby can't be a problem with C15, as the response is flat at the tuner output when going into the passive/active input. I should also note that the voltage measurements I took...
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    SWR Bass 750 no bass, cap values?

    I've got this Bass 750 that I bought as a project. Replacing the preamp tube got it working, but the low end is really weak. If I put test tones into it the voltage amplitude (at speaker out and...
  26. Make sure you are plugged into the correct output...

    Make sure you are plugged into the correct output jack.
  27. I think it really depends. I had terrible...

    I think it really depends. I had terrible experience trying to get support from Ampeg, this was before the Yamaha acquisition.
  28. The instability is basically my concern. My...

    The instability is basically my concern. My thought was to keep loop gain the same, but since I don't know exactly what the impedance ratio was on the original transformer I maybe shouldn't assume...
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