Gretsch Fury Reverb issue

[johnk_10]

i just finished replacing all of the filter caps, quite few coupling caps in my buudy's Gretsch Fury and the amp it's sounding great, but for the life of me, i can't figure out why the reverb isn't working.
i've repaired reverb circuits on 100's of fenders, and it was always either the tank (broken leads to the tiny xformers in it, or an open one), the RCA cables, the reverb drive transformer or reverb drive tube, or the recovery circuit or the tube.
on this one, when i turn the reverb level up, the (unreverberated) signal level drops in level thru the speakers quite a bit. when i shake the amp, i get the spring crash thru the return, so it's definitely in the send/drive circuit. it uses a 6973 (RCA) to drive the tank and i tested it on my triplett 3444 and it tested at new spec, i also checked every resistor, cap, and even subbed a fender drive tranny in it, and also ohmed out the reverb tank's input and output xformers (all good), but still the same results. i'm getting absolutely no signal on the scope on the drive signal to the tank. does anyone have idea of what i'm missing here?

here's the schematic of the circuit:


my voltage readings on the 6973's (V4-A) tube socket:
pin 3: getting plenty of signal with it's level controlled from the amps input volume pot
pin 7 : .035V (IMO, this is the problem!)
pin 8: 314V
pin 9: 384.5V


any help would be greatly appreciated as i'd like to get this one off of my bench.

[johnk_10]

i'm stumped and since i don't have another 6973 on hand, i'll have to wait to try another one in it until a couple of them that i ordered arrive on thursday.

[johnk_10]

crickets chirping..............................

[johnk_10]

fixed it today.