[Boatanchors] SWAN

[D C _Mac_ Macdonald]

I built a WRL 755 VFO from the kit somewhere around 1958 to replace a Heathkit VF-1.  It appeared to be very stable after a fairly short warmup.  I ran it into the rig I had built using a 6AG7 Pierce oscillator to a pair of 807s, modulated by a pair of 1625s.  I frequently zero-beated SSB QSOs at the top end of 75 meters and joined in for fairly long chats until one of them would tune off and find my carrier.  I'd say that was pretty good stability! 
  
* * * * * * * * * * * 
* 73 - Mac, K2GKK/5 * 
* (Since 30 Nov 53) * 
* k2gkk hotmail com * 
* Oklahoma City, OK * 
* USAF & FAA (Ret.) * 
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> Date: Tue, 27 Oct 2015 18:30:29 -0500
> From: ranchorobbo at gmail.com
> To: w4byg at att.net
> Subject: Re: [Boatanchors] SWAN
> CC: boatanchors at mailman.qth.net; krkaplan at cox.net
> 
> you have to leave them on.
> 
> On weekends at least, the V10 stays on.  Takes a few hours to
> completely settle down.
> 
> The first '50s VFO I ever got into was a WRL 755.  I looked around and
> did the usual restoration changes, fixing up the power supply and so
> on, and at some point noticed the wiring around the transformer was
> wrong.  Someone had changed it so the filaments were always on if the
> VFO was plugged in.  I didn't know any better so I put it back to the
> way it was originally.  It wasn't until later I learned why that
> modification was made, hi.
> 
> 73
> 
> Rob
> K5UJ
> 
> On Tue, Oct 27, 2015 at 6:20 PM, Ray, W4BYG <w4byg at att.net> wrote:
> > To be fair, in the days of tube VFO's and receiver oscillators, almost all
> > radios made only for the ham market drifted,  Some worse than others, but
> > most of them necessitated you retune several times throughout a QSO.
> >
> > (You really haven't had a QSO in ham radio until you followed a Heathkit
> > DX-100 with the Cuban chirp, all over the 20 meter CW band).
> >
> > The tubes generated heat which over time changed the ambient temperatures
> > within the chassis and therefore the L-C circuits, etc.
> >
> > For most who couldn't afford the most expensive commercial class gear, they
> > had to live with it.
> > Ray, 62 years and counting as W4BYG