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  1. Replies
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    I've never seen that silk screen symbol, but I...

    I've never seen that silk screen symbol, but I also would have read that as 1,2,3 left to right, but since R111 is connected between base and collector (1 and 2) then it has to be 3,2,1 Maybe the...
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    So this seems to narrow it down to the power amp...

    So this seems to narrow it down to the power amp section, or possibly the effects loop jacks/circuit. I would pull the PI tube and see if the noise persists. If there is still noise with no PI tube...
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    419

    Isn't the bit with the Fender sticker just a...

    Isn't the bit with the Fender sticker just a cover? Could somebody have swapped the cover (backplate?) from the original speaker onto this Weber just to make the amp look more original?
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    671

    It looks like there are essentially two ground...

    It looks like there are essentially two ground domains, one called GNDA and one called FGND, but they should be connected via JMP1 and JMP2. Adding 1.3V to each of the 15V rails would make those...
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    Were these taken with cable plugged into XR...

    Were these taken with cable plugged into XR header? If so I would repeat with it unplugged. Odd the difference in the output of the +/- 15V regulators. If the 48V is still low with XR unplugged I...
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    Have you called Fender? They have always been...

    Have you called Fender? They have always been good to me about giving me whatever schematics they have.
  7. Replies
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    671

    The HDR100 is supplying 25V to both A and B...

    The HDR100 is supplying 25V to both A and B circuits, right? So you can power up everything except the power transistors (which come off of the J101,J202 AC lines). If you leave J101 and J202...
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    So HDR100 is the AC for your +/-25V supply and...

    So HDR100 is the AC for your +/-25V supply and J202 is the AC for the +/-40V supply, right? When you have only one of them hooked up your bulb is dim, but if you hook them both up it is bright,...
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    Most testers use a very small voltage to test the...

    Most testers use a very small voltage to test the transistor junctions, like 5V, and it is possible to have a transistor that seems OK at low voltages and then behaves differently in circuit. In...
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    Was the bulb bright, or bright-ish, when they...

    Was the bulb bright, or bright-ish, when they were getting warm? If the bulb is glowing and the transistors are getting warm I would say that they are suspect. To quote something said often by the...
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    Can't find anything about the HV transformer, but...

    Can't find anything about the HV transformer, but if the F-46X being used for bias is the same as this one (https://www.newark.com/triad-magnetics/f-46x/transformer-iso-24v-24va/dp/03F1003) I don't...
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    Agree. I would also check the voltage rails for...

    Agree. I would also check the voltage rails for the op amps and the power amp.
  13. Replies
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    671

    Generally, yes. As I understand it the magic of...

    Generally, yes. As I understand it the magic of the light bulb is that its resistance goes up when it gets hot, so when current is high most of the voltage drops across the bulb. Depending on the...
  14. https://www.belden.com/blog/broadcast/all-about-70...

    https://www.belden.com/blog/broadcast/all-about-70-volt-speaker-systems
  15. Replies
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    671

    It is in the power module pdf, left edge of the...

    It is in the power module pdf, left edge of the page. Top of vertical section C.

    55881
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    I've done worse. I would focus on voltage rails...

    I've done worse. I would focus on voltage rails from the power supply, especially if it is a separate board. Unplug whatever you can, and if you have a variac and/or light bulb limiter use those to...
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    I think it looks really great!

    I think it looks really great!
  18. Was it made by Bell Labs or is it a bell ringer...

    Was it made by Bell Labs or is it a bell ringer (or bell tower) amplifier? Google tells me that Verdin is a bell, carillion, and organ company. Seems many of their amplifiers were made by McIntosh.
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    Possibly. I am just wondering if the design that...

    Possibly. I am just wondering if the design that you bought led you astray on the fretboard height.
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    I might be misunderstanding but it seems like...

    I might be misunderstanding but it seems like this is is not right. The fretboard should sit up higher than the body. Here is a picture of a 4001 neck joint that I borrowed off Reverb. If your...
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    Did you lower the bridge? I was having a bit of...

    Did you lower the bridge? I was having a bit of trouble following some of the description and understanding if the action was high everywhere (like up at the 1st fret) or if it was OK there and got...
  22. Thread: CList fibs

    by glebert
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    144

    That sucks that you got burned.

    That sucks that you got burned.
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    This is normal with a standard Les Paul wiring...

    This is normal with a standard Les Paul wiring scheme. It confused the heck out of me the first time I got a guitar that had hat, as my previous 2 pickup 4 knob guitar was different and didn't have...
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    According to Tamerlane's facebook page: The...

    According to Tamerlane's facebook page:

    The Model 1733 is HERE! This is a single ended CLASS A amplifier with Tube Voltage Rectification and Tube Voltage REGULATION!!

    Then again he also had a...
  25. I've had that happen with my Peavey Triumph, IIRC...

    I've had that happen with my Peavey Triumph, IIRC on that one there are some noise reduction diodes on the gain channel.
  26. Yeah, that one didn't change anything when I...

    Yeah, that one didn't change anything when I tried it. I was hoping there was some known issue with the mute circuitry.
  27. Enzo, mind elaborating? Is this an actual mute...

    Enzo, mind elaborating? Is this an actual mute circuit problem or operator problem? I have a TSL 100 with *very* low output, but I took one look at the mess of cables and connectors and put it to the...
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    I had an M-80 chorus head. I really liked the...

    I had an M-80 chorus head. I really liked the reverb on that one. The clean channel was nice.

    This is what the output waveform looked like on the drive channel. If you worked in the contour you...
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