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Jet City JCA20 Mods?

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  • #31
    This is an ***OOOOOLLLLDDDDD*** thread and John Frondelli hasnīt been seen here for years now, but if sombody here updates the schematic showing "pin 7" and on which tube, I can suggest what to do with a 47pF cap there.

    Pin 7 on a 12A*7 is a grid, so in principle thereīs 2 basic possibilities:

    a) grid to ground .... which I donīt think will do much,but letīs check the schematic first, and

    b) grid to plate, which should cut top end.

    Again, letīs see that schematic.

    EDIT: many old files were lost when server crashed, so old images and PDF not opening are common.
    Juan Manuel Fahey

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    • #32
      I think this is the schematic in question:
      Attached Files
      Originally posted by Enzo
      I have a sign in my shop that says, "Never think up reasons not to check something."


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      • #33
        Hi Billyz! I know this is an old thread, but is their any way you can send me the thumbnail pics of your mod? I can't see them on the thread for some reason. Thx!

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