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    While you're working on that 1st generation SM...

    While you're working on that 1st generation SM 900, take a good look at the power supply assembly. It's a PITA to get up off the chassis, often hampered with the standoffs spinnning to fight you...
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    ....pretty sizable hum, which he said always did...

    ....pretty sizable hum, which he said always did that from new 4 yrs ago.......so much for quality control screening at Fender. I've no idea what their QC practices are......such as spot-check...
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    Corona Dope source

    The source for the MG Chemicals Super Corona Dope P/N 4226-55ML is Mouser Electronics, their P/N 590-4226-55ML @ $11.06 55mL bottle.
  4. I thought I had a full photo on this Deluxe...

    I thought I had a full photo on this Deluxe Reverb where I had tweaked the leads for V5 for minimum ticking. It's the stock Fender 'bug', and the copper leads are nearest the tube wires, putting the...
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    What DrGonz 78 said ^^^^^^, or perhaps a broken...

    What DrGonz 78 said ^^^^^^, or perhaps a broken trace, to restore the xstr's emitter to the circuit?

    As to WHY the pair on the one side failed........were these the non-Sanken Substitute parts? ...
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    A recent PCB trace burn repair done on an Aguilar...

    A recent PCB trace burn repair done on an Aguilar DB 751:

    54038 54039 54040

    After having scraped away all of the chared remains, which took going down a full level of the fiberglass layer, I...
  7. You could just leave the speaker connected on...

    You could just leave the speaker connected on this 'Reverb Tank EQ Amp, just to be safe. You're using this amp's Volume control (and Master, if it has one) to set the drive level to the Reverb tank...
  8. I like the thought of that!!

    I like the thought of that!!
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    Yes, there are two traces. I've shown them in...

    Yes, there are two traces. I've shown them in RED, adding them to your photo below:

    54037
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    SWR SM900 Evolution

    There have been 3 versions of the SM900, as far as I've seen in our rental inventory. From the front, they all pretty much look the same, but radically different inside. Some images of the amp...
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    I don't recall the 400Hz Standard Test Frequency...

    I don't recall the 400Hz Standard Test Frequency for defining nominal impedance. I think speaker mfgrs use the 0 phase frequency in the low midrange trough where impedance Q is broadest. Changes...
  12. While I've never tried this, taking the Reverb...

    While I've never tried this, taking the Reverb Output signal from it's 12AT7 circuit via the low impedance transformer, feeding a stand-alone equalizer, such as a 3 or 4-band parametric Equalizer,...
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    Very few of us have a multimeter that has VERY...

    Very few of us have a multimeter that has VERY FAST reading rates. Most economical Multimeters are 2-3 readings per second, to begin with. Using a Guitar as your signal source produces a complex...
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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,...
  15. 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...
  17. 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.
  19. 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...
  21. 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...
  27. 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,...
  28. 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...
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