[Johnson] Valiant CW key jack acting wierd:

[Frank Donnelly]

Hi All;  I have a Valiant on my bench. I run it with a KW matchbox into 
a 75 meter full wave horizontal loop cut
for 3.880.  I works great on AM. Get very good signal reports.
I tried to use it on CW and it works FB with 150 watts out, BUT when I 
plug my MFJ keyer into the jack, it kills
the meter when in the grid position.
I had to change my keyer jumpers from direct keying to Grid Block keying 
internally to get it to work.

In an effort to determine if it was the keyer, I plugged in a bare phono 
plug and it did the same thing.
I plugged in my straight key and same thing. SO it is not the keyer..
A previous owner did a Mod for RTTY on my Valiant.  It did not seem to 
bother my AM operating, so I left it in place.

Does anybody know where I can find a copy of the mod he used?   The mod 
involves a RTTY jack and a Shift knob on front panel and underneath he 
placed a 6AL5 tube and on back bandswitch wafer he installed what looks 
like an extra series parallel
string of capacitors from the rear wafer to Gnd and installed another 
wafer Sw on rear panel to switch the extra Caps in or out of the circuit.
I am thinking that this mod is effecting the meter grid reading when a 
jack is plugged in.
If I cannot find a schematic he used, my only recourse would to open it 
up and get out the original schematic and blueprint it.
Every time I want to check the Grid currant, I have to unplug the keyer.
Any ideas out there

Tnx  & 73  Frank   KI0RQ