[R-390] Crystal Deck

[Steve Hobensack]

I operate a '63 Imperial. I once had trouble with 80 meters being very unstable. The problem was leaky B plus voltage across the ceramic trimmer in the crystal deck. Collins designed great stuff, but why in world was B plus on those trimmers? i corrected the problem with a blocking capacitor and a megohm drain at the trimmer. Could a "master" blocking cap be put at the rotary switch? I should have tried that when the deck was out of the rcvr.

N8YE