HW-101 Warble problem

[Stewart D Lyon]

Jeff -- I would check out the alignment of the dial assembly. I'll bet
there is just enough misalignment there to put a slight stress on the
bearings of the tuning capacitor and cause the warble.  The trimmer
capacitor may also be a problem.
The construction of these two caps leaves something to be desired in my
opinion.
 Look inside a LMO (used on the SB-stuff) for a lesson on how to really
build a VFO.
73, Stu - W6CUX
Winnetka, CA

On Tue, 10 Nov 1998 11:13:58 CST Jeffrey Weiss <weiss at tds.net> writes:
>Hi,
>Going nuts.
>Trying to get back in the hobby after years of  virtual absence. The
>mind is willing but the rig is weak.
>On receive and transmit there's a small frequency shift or warble
>around a center frequency--it's not really
>drift. This makes CW impossible and SSB embarassing--and illegal, I'm
>sure.
>I have taken the VFO aprt and secured the 4700 pf mica cap to the
>housing with glue; there are
>no components with long leads in there.
>I have swapped 6AU6's and sprayed contact cleaner in every socket.
>Checked most of my tubes at a tube
>tester 99 miles away--except for the 0A2 VR tube. Tester didn't
>support it.
>Voltages appear to be normal. Shorted out the PS socket to allow it to
>be powered with no load for days in the thought that capacitor reforming

>was necessary.
>Now what--and ideas? Has anyone seen this problem?
>My wife won't let me just go out and buy a new rig cuz it's a dead
>hobby :-(( I have to prove her wrong.
>Thanks,
>Jeffrey Weiss
>

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