[Drake] R4B Sick AVC

[GGLL]

    What's up if the AVC switch is in the off position?, in this way, 
you  are working without any avc circuit and may be able to vary avc 
line at will from a very negative value to aprox. stated -1.4 V.
    Q4, 2N3877, is the AVC rectifier/amplifier , take a look at it; also 
check diodes in the associated circuits (D13 for example).

Good luck
Guillermo - LU8EYW.

Ka9p@aol.com escribi�:

>Thanks to everyone for help on the PTO last night, lost a little sleep but 
>all is well with it now,
>
>One last problem I could use a hint or two on.  Receiver sensitivity has just 
>dropped like a rock, tube swaps don't help, measured AVC test point and get 
>-85v on standby and -14 in operate (explaining loss in sensitivity) tube swaps 
>don't effect it - is there a component or two known to fail causing AVC to go 
>way negative?
>
>As always, any help greatly appreciated.
>
>Thank, Scott
>
>
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