[Boatanchors] Johnson Valiant II VFO

[Al Parker]

Hi Dave et al,
    I don't see the Johnson list, so don't know what responses have been
there.
    The Valiant/Ranger, etc., VFO's have a dropping resistor in the line to
the VR tube which is inside the VFO box IIRC.  The resisitor is abt 12k or
15k, 2 watts, and goes high in value as it gets very hot.  Then the VFO
chirps.  I can't remember if the resistor is inside or outside of the box,
but it should be mounted outside, and be a 10watter if posible, at least 5w.
Some guys have moved the VR tube out of the box, but I think just getting
the dropping resisstor out helps the drift.
    I suspect the 122 VFO is much the same.  I've been into both the Ranger
& Valiant to make the resistor change, without removing the VFO, but it's
tight, and tough to get into it.
    It should not chirp.  That dropping resistor usually fixes the chirp.
73,
Al, W8UT,
New Bern, NC
www.boatanchors.org
www.hammarlund.info

----- Original Message -----
From: "Dave Maples" <dsmaples at comcast.net>
To: "Johnson List" <johnson at mailman.qth.net>; <Boatanchors at mailman.qth.net>
Sent: Sunday, March 18, 2007 2:12 PM
Subject: [Boatanchors] Johnson Valiant II VFO


> All: I have several questions about the Valiant II VFO, inspired by the
> exchange on the 122 VFO a bit earlier.  I've never gotten the pull out of
> this VFO; that won't help much if I want to run the SSB adapter with it.:
>
> 1. Is there a good procedure for pulling the Valiant II VFO out of the
case?
> I seem to recall some special concern about the coupling to the dial, and
> fragile unobtainium parts.
>
> 2. As I adjust the keyer circuit with the pot in the back of the rig, I
have
> listened to the VFO note.  I seem to recall that in a Valiant II the VFO
> simply goes from oscillating to quiescent without a lot of change in
> frequency (based on adjusting one some 36 or so years ago), but the one I
> have pulls horrendously just before it stops oscillating.  Is there anyone
> who can tell me how the VFO should behave just before it stops oscillating
> when adjusting the keyer circuit?  I'm thinking that the VFO is sensitive
to
> changes in the bias voltage in the transmitter, much more so than it
should
> be.
>
> 3. Assuming this IS abnormal, does anyone have suggestions on what's going
> on in there?
>
> 4. Finally, has anyone documented the voltages to be found inside the VFO
> case?  The terminal strip voltages don't help a lot...
>
> Thanks,
> Dave WB4FUR
>
>
> _______________________________________________
> Boatanchors mailing list
> Boatanchors at mailman.qth.net
> http://mailman.qth.net/mailman/listinfo/boatanchors
> ** List Administrator - Duane Fischer, W8DBF/W9WZE **
> ** For Assistance: dfischer at usol.com **
> $$ For vintage radio info, see the HCI web site $$
> http://www.w9wze.org
>