[TenTec] Corsair Model 561 PTO

[Michael Shortland]

> I have just acquired a Corsair Model 561.  Fine rig, but I get PTO
> instability on CW all bands.  Not slow drift, but frequent step changes up
> and down of a few 10s of Hertz over long periods.  Also, warbling can be
> heard as band is tuned.  Have checked that the regulated voltage supply is
> steady.  Frequency of PTO is not affected by vibration.   
> 
> Any suggestions on the source of the problem and a fix, please?  How do I
> remove the PTO to check components, solder joints, etc?
> 
> Regards
> 
> Mike G0EFO
> 
> Guildford UK
>