Jet City JCA20 Mods?

[J M Fahey]

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.

[g1]

I think this is the schematic in question:

[Matt B]

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!