[Johnson] Johnson Valiant Zero

[Chris]

Hello to the Group

 I have a Johnson Valiant and was wondering about the Zero setting on the 
Oscillator Control.. I have noticed that it has really become hard to hear 
in the Receiver that I have paired up with my Valiant and was wondering if 
anyone out there could give me a little insight as to what might be the 
cause of the problem with this...Thanks in advance 73 Chris W7ULA