[Drake] TR4C weak audio and poor sensitivity

[Dick KF4NS]

During the restoration I discovered what may be my worst nightmare. 
The sensitivity and weak audio changes from band to band when I switch 
sidebands. That to me says it is likely to be one of the filters.

Example: on 20M the trouble is on USB and on 15M it switches to LSB, 
in other words the trouble is always when the sideband switch is in 
the X position.

All tubes have been tested and shorted/weak tubes replaces with new 
ones (pretested).

The contacts of all switches have been cleaned and the sideband switch 
tested for continuity.

The 9mhz osc was adjusted for zero beat with C130 injecting a 
calibrated signal to grid 1 of V12.

I have no idea if it may be an alignment problem caused by changing 
several tubes so please clue me in if that would cause this trouble.

73, Dick KF4NS
St Petersburg, FL 33714 USA
Keep The Glow!