VHF tuner problem

[Jon A.]

Originally Posted by old_tv_nut

Those feedthrough caps are just 1000pf; am I reading the schematic right?
Should be a very non-critical value and a sub from your cable box ought to work.

Yup, and I've compared it to other schematics, seems to be a very common value for tuner/IF applications.

Originally Posted by zeno

The feed thrus are pretty tough. I have even used a gun on them.
To be sure you can unhook the AGC & sub a voltage you
can vary. look at manual for range.
If you can change that FET you are a better man than I !!!

73 Zeno
LFOD !

I disconnected the AGC on the substitute tuner last night just to see what would happen; looked the same as if I had disconnected the B+.

Man, I read those feed thrus are rather delicate, so much for that.