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    I have one of those necklace reverbs from a PR-40...

    I have one of those necklace reverbs from a PR-40 tone cab. Is there any reason to use the necklace reverb over the conventional stretched spring tank for a guitar amp? Like I need another project.
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    Yes, and Hammond has the patents on the spring...

    Yes, and Hammond has the patents on the spring reverb. They used to make them in house and then started up the Gibbs company to make them.
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    This one appears to be exactly like what’s in my...

    This one appears to be exactly like what’s in my M13A.
    ...
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    My M13a cabinet also has the angled piece of wood...

    My M13a cabinet also has the angled piece of wood between the amp and the speaker.
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    I just found a picture online at Chicago Music...

    I just found a picture online at Chicago Music Exchange. The M15 has the same style of aluminum box to mount the reverb pan.
    ...
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    Yes, my tank is mounted vertically on the rear...

    Yes, my tank is mounted vertically on the rear cabinet wall in a 3-sided aluminum box with foam.
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    DCR measurements are 177 ohm output, and 173 ohm...

    DCR measurements are 177 ohm output, and 173 ohm input.
    It’s a 17 inch long Gibbs 2-spring tank.
    No model# on my tank, but I believe the modern equivalent is 4FB2A1C, both input and output jacks...
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    I don’t have an M10, but I do have an M13a. The...

    I don’t have an M10, but I do have an M13a. The M13a also uses a 12AU7 to drive the reverb tank. I’ll measure the impedance of my tank and post the findings.
  9. That’s strange, the google book opens when I...

    That’s strange, the google book opens when I click on it.
  10. Maybe this helps....

    Maybe this helps.
    https://www.nde-ed.org/GeneralResources/MaterialProperties/ET/Conductivity_Iron.pdf
    ...
  11. I don’t believe the value given in that table for...

    I don’t believe the value given in that table for pure iron. The value given for 1010 steel is correct and should be the same for pure iron.

    In my past life, I had an equation for calculating the...
  12. No, those measurements are for 1.5 Tesla / 60Hz....

    No, those measurements are for 1.5 Tesla / 60Hz. You won’t ever find relative permeability numbers for different types of steel because the permeability is too dependent on the microstructure of each...
  13. The permeability of 1006 to 1010 could range from...

    The permeability of 1006 to 1010 could range from 500 to 3000, depending on the %cold work, the microstructure, and the crystallographic orientation of the grains. An annealed structure will have...
  14. You can reduce the permeability of the screw by...

    You can reduce the permeability of the screw by changing the microstructure of the steel. Large grains with a fully annealed and softened structure will have the highest permeability. Any cold work...
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    I had an Ampeg Dan Armstrong guitar many years...

    I had an Ampeg Dan Armstrong guitar many years ago, and it was designed so you could just plug in different voiced pickups. Maybe that idea needs to be revisited?
  16. But can’t you just easily charge Alnico magnets...

    But can’t you just easily charge Alnico magnets by using Neodymium magnets? Lots of videos on YouTube demonstrate how easy and inexpensive to charge or discharge Alnico magnet pickups.
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    Thanks again for taking a look at the miswired...

    Thanks again for taking a look at the miswired circuit. Itís definitely not the way to hook up the MV control, based on the sonic results at low settings. Some folks claim the Lar/Mar PPIMV isnít...
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    Thanks much for the explanation. I couldn’t see...

    Thanks much for the explanation. I couldn’t see the difference with the pot acting as a voltage divider.
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    A word of caution on implementing this PPIMV. As...

    A word of caution on implementing this PPIMV. As drawn, it works great. I screwed it up when I installed it in my Tweed Twin 5E8A clone. By mistake, I reversed the leads on the dual pot. I put the...
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    I’d rather be in charge of the Marketing dept,...

    I’d rather be in charge of the Marketing dept, with a big expense account.
    I’d call the new tube an ENZO34.
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    Maybe I’ve got it wrong, but the secret sauce for...

    Maybe I’ve got it wrong, but the secret sauce for making a kinkless beam tetrode is careful alignment of the signal grid g1 and the screen grid g2 + the added beam plates tied to the cathode. A...
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    Yeah the three grids shows the EL34B proves it’s...

    Yeah the three grids shows the EL34B proves it’s a pentode. I got my mis information from the tube store, sorry about that.

    https://blog.thetubestore.com/birth-of-the-shuguang-el34-b-vacuum-tube/
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    Yes, some folks claim that the EL34B and KT77...

    Yes, some folks claim that the EL34B and KT77 have the same internal parts. I don’t know if that’s true or not.
    I do know that The Shuguang EL34B tubes sound a lot different (and better) than NOS...
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    Hate to bring more bad news, but according to...

    Hate to bring more bad news, but according to Shuguang, their EL34B tubes are tetrodes, not pentodes.
    Their EL34A was a pentode, but was discontinued, likely because of problems with reliability.
  25. Iíll give that a whirl.

    Iíll give that a whirl.
  26. Interesting, I’ll ask my doctor if can write me a...

    Interesting, I’ll ask my doctor if can write me a prescription for cannabis to cure my chronic silver mica disease.
  27. No Faraday cage on the amp, just built like a...

    No Faraday cage on the amp, just built like a Fender Tweed from the 1950s. I hadn’t played the amp in a few years, and it used to be a fairly quiet amp relative to hum. I recently installed a PPIMV...
  28. I can rule out a cold solder joint because I’m...

    I can rule out a cold solder joint because I’m overly careful with soldering, use heat sinks on every component so I don’t damage any, inspect the joint for good flow and then measure resistance...
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