Thought this could be (a) a bad FET, (b) a cap in the phantom circuit gone to heck, (c)etc.,
traced it to this weird setup.
These little "cups" seem to contain some sort of conductive goop that has dried out, allowing the resistor to make a capacitive connection that sputters horribly.
However, bridging the "goop" with a little solder creates a state of lower output, and rolls off a lot of high frequency, so I guess the "goop" is something rather special.
Any ideas as to what the heck this stuff is, and what might be a worthy fix?
BTW, that's an smd peeping out from under the resistor, not an errant glob of solder from my hasty bridgework and removal.
Thank you
traced it to this weird setup.
These little "cups" seem to contain some sort of conductive goop that has dried out, allowing the resistor to make a capacitive connection that sputters horribly.
However, bridging the "goop" with a little solder creates a state of lower output, and rolls off a lot of high frequency, so I guess the "goop" is something rather special.
Any ideas as to what the heck this stuff is, and what might be a worthy fix?
BTW, that's an smd peeping out from under the resistor, not an errant glob of solder from my hasty bridgework and removal.
Thank you