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  1. Replies
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    While there are numerous amps that change power...

    While there are numerous amps that change power level by going from pentode to triode mode, or dropping the power supply potentials in half, those to me haven't changed the SPL level of the amp,...
  2. I went over to our other building down the street...

    I went over to our other building down the street & around the corner to give a look/listen to another of the Magnatone amps in our inventory. As I suspected, you don't need either the foot switch...
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    To show graphically what Helmholtz just stated,...

    To show graphically what Helmholtz just stated, where in normal use, the sounds from the organ will rarely dwell at the 'nominal' impedance value, and more like twice that value as a average would be...
  4. I've looked thru those on Google, as well as...

    I've looked thru those on Google, as well as MagnatoneAmps website. This is a current production model, so I'm sure it wouldn't be posted anywhere. I haven't yet gone to Magnatone on this. I was...
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    Hey..........that looks like a NICE tool! It...

    Hey..........that looks like a NICE tool! It reminds me a lot of the Leister Hot Air Gun, at 1/10 the price. I'm tempted to pick one of these up myself, along with that collection of nozzles.
  6. I believe it is MPS (Magnatone Panoramic Stereo)

    I believe it is MPS (Magnatone Panoramic Stereo)
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    I gather there is a Direct Out from the organ, so...

    I gather there is a Direct Out from the organ, so you're just looking to mute the speaker? Depending on where that direct out is from, using the dummy load will at least remove the sound from the...
  8. Magnatone Panormic Stereo Combo--Vibrato/Tremolo not working

    One of our Mangatone Panoramic Stereo Combo amps came over with no reverb, with a broken internal xfmr pin wire that I wasn't able to restore, so had to order another 4AB2C1B tank....put a 4AB3C1B...
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    Are you referring to the internal thermal fuse...

    Are you referring to the internal thermal fuse buried inside the windings? Class B insulation is 130 deg C, so you'd be safe using an OOR Thermal Fuse in the 115 deg C to 130 deg C, which would have...
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    This is what I love about this forum. There's...

    This is what I love about this forum. There's ALWAYS something new to discover in how stuff was built over the ages. Never until now have I seen a pair of dedicated speakers used for the Reverb,...
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    While always using industry standard AC Mains...

    While always using industry standard AC Mains fuses carrying 250VAC ratings from any of the normal sources (Bel, Bussman, Littelfuse, Schruter, etc), it still never fails to surprise me finding a...
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    Excellent document, now added to my database for...

    Excellent document, now added to my database for further study. Thanks for providing that!
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    If you have an AC Mains Power Analyzer, or an...

    If you have an AC Mains Power Analyzer, or an accurate AC RMS Ammeter, you'd start with probably a 3A S/B fuse installed. Run the amp up to full power at High Line (127VAC, assuming you have a...
  14. I put everything back together. Easy to loose...

    I put everything back together. Easy to loose track of which screw holes thru the two heat sinks go to the chassis standoffs, and which ones are for the two fans that only screw into the heat sinks,...
  15. OK, having connected my HP 6227B 0-25VDC/0-2A...

    OK, having connected my HP 6227B 0-25VDC/0-2A Dual Tracking supply to the Ground pin & +/- terminals of the LV bridge (passing current thru the two supply fuses F3 & F4, I ran the supplies up while...
  16. You're right. I've never given the absence of...

    You're right. I've never given the absence of reverb tank loading on the Driver Xfmr a second thought, when I have to pull the chassis from the cabinet, while the tank is well secured inside the...
  17. Back to the original problem with the amp, which...

    Back to the original problem with the amp, which turned out to be this shorted 37099 Driver Xfmr Primary.........I've never encountered one of these failing that way. For a very brief time when I...
  18. Arciing evidence found on the lower voltage middle pins/sockets of AC Secondary wiring

    OK, I think I've found the culprits. On the 7-pin PCB header, which receives the three power xfmr secondary coils, the middle LV winding having a Center Tap, those three middle terminals showed...
  19. So, that internal thermal device IS a one-time...

    So, that internal thermal device IS a one-time Open On Rise Thermal Fuse. I've found them inside the cardboard tubes buried in the windings of Fender Deluxe Reverb power xfmrs and the like. With...
  20. You're absolutely right. One would have to...

    You're absolutely right. One would have to calculate that from the measured Rs and the inductance Ls......Z = Rs + jwLs. The Operator's manual gives all the formulas for the various relationships...
  21. That was a typo.....it's the GenRad 1658...

    That was a typo.....it's the GenRad 1658 Digi-Bridge. I did once own a General Radio 1568 1% Wave Analyzer that I had bought for $25 in beautiful condition at a swap meet. Sold that years later,...
  22. GK 2001RB Buss Fuse F4 open. This ALWAYS bothers me when just one 15A fuse blows!

    A GK 2001RB came in last week from our rental inventory with the note (No OUTPUT). After pulling the cover for initial scrutiny, I found all of the main Bridge Rectifiers fine, and three of the four...
  23. Ah...that was AC resistance. It was without the...

    Ah...that was AC resistance. It was without the xfmr being connected. The Inductance reading was nearly the same both at 120Hz and 1khz, while the serial AC resistance changes substantially (3.03k...
  24. I must have bought the last one that was in stock...

    I must have bought the last one that was in stock at Antique Electronic Supply a couple months ago. I almost modded the Twin I had from our rental inventory of 65 Reissue Twins, after failing to...
  25. Ahhh........solder joint fracture! My old...

    Ahhh........solder joint fracture! My old 'friend'. I wouldn't have guessed it being the Ground terminal of the IEC-320 Power Socket at first, though on all of the Marshall amps that come thru my...
  26. The replacement Fender 37099 Reverb Driver Xfmr...

    The replacement Fender 37099 Reverb Driver Xfmr arrived. It's primary inductance was considerably higher than Helmholtz' 125A20B Driver Xfmr, measuring 28.1H @ 1kHz, 6.04k impedance @ 1khz. That...
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    What does the Low/Hi Mode Switch do? EXCELLENT...

    What does the Low/Hi Mode Switch do?

    EXCELLENT RE-BUILD JOB!!
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    NICE JOB!! I know what ya mean with regards to...

    NICE JOB!! I know what ya mean with regards to how much time it required. I'm guessing shops that do this sort of thing on a regular basis charge about the same, and having done enough to have it...
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