good evening guys

I would like to ask for advice on the repair of a pair of drake t-4XC that have 
a similar problem.

the first:

During transmission in cw, sidetone returns normally, except that in addition 
to the manipulation telegraph with a normal note, has a second whistle with the 
same frequency note, that should not be there ...
I know there is some problem on the circuit sidetone but I would like an 
opinion on who is more experienced than me.

The second:

The second t-4XC (that is, what iuse every day as main rig) recently has the 
sidetone note  it moves a few dozen hertz up and down (only the sidetone 
note….not in air) .... few things; only an attentive ear can find…. 
For me a bit annoying though, and if possible I would like to fix it.

can somebody help me?

Many Many thanks

Paul, IK1QHB
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