[Drake] TR4C weak audio and poor sensitivity

[GGLL]

	What about performing an elementary sweep with the calibrator signal 
(at the "best" band) that is, rocking VFO knob from zero beat upto 
highest pitch and noting the Smeter readings?.

Regards
Guillermo - LU8EYW.

El 16/06/2010 20:26, Dick KF4NS escribió:
> 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!
>
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