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  1. A

    JMP mod 1987, component between power tubes

    Just to get back (if anyone later searches for this) and close the thread: I tried the amp without the F2 fuse inserted - and it worked just fine, also cranked. I’ll probably just leave it without that fuse, to allow the thermal fuse to actually work if needed.
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    JMP mod 1987, component between power tubes

    Thanks, that was solved quickly! It indeed looks a lot like an older variant of e.g. https://www.sensata.com/sites/default/files/a/sensata-1nt%20series-fixed%20temperature%20thermostats-datasheet.pdf Got curious and just had to open the amp up to check if there’s a temperature marking I had...
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    JMP mod 1987, component between power tubes

    Hi, I have an '83 JMP mod 1987, SEMKO version. It has a component between the power tubes I cannot identify - neither through searching here nor elsewhere, or trying to understand what it actually would do. See images below, and: - Mounted between the power tubes - Seems stock, based on the...
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    The Silver Jubilee Cult

    @dbranger94 and @Point 2 Point - here's what I have: It's not just a width x height x depth, as the badge geometry is a bit more complex. Badge measured on a 2556 cab. Dimensions: The "main badge" max dimensions: 90mm W x 40 mm H x 3.5 mm D The "main" is mounted on a "back piece" (they seems to...
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    Simple Attenuators - Design And Testing

    I can add my plan: I'm just about to be finished with my build, I will post some information regarding the fan here, and the whole build in the other thread with finished attenuators. I have a line-out, and I plan to later build a second box connecting to the line-out, with a couple of...
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    Simple Attenuators - Design And Testing

    Great, thanks @JohnH for clarifying - I'll just build as the normal -7 dB Stage 1 then. It's anyway easy to add more functionality later, e.g. modifying with an additional -3 dB switch, so I'll see if I will ever need one! For the fan, my thoughts (might be of interest to others, and I'll post...
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    Simple Attenuators - Design And Testing

    Hi all, This is a really great thread. I previously had found an L-pad based schematic online and was about to build one, but stumbled upon this thread - sounds like a much better option! So, I'm building a 100W model (I have both 50W and 100W amps), 8 ohm, 4 outputs plus line out, likely in...

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