[Boatanchors] outboard power supply for EF Johnson VFO 122

[K9FFK]

Use a 12AU6? 12.6V, 0.15A

K9FFK

On 4/25/2021 1:41 PM, brianpepperdine brianpepperdine wrote:
> I think I have seen the occasional recommendation to run the VFO 122 from a
> remote power supply, rather than use the internal p/s of the Viking II (for
> instance).
> Why is this - what is the consequence for the VFO and/or transmitter?
>
> I can see by its on line index there was an article a 122 power supply once in
> Electric Radio, which of course I don't have.
>
> I recently watched a video on the D Labs YouTube channel re. his project to
> mount a Ranger/Valiant VFO into its own box with an accompanying power supply.
> Simple enough it seems.
>
> Pondering that I realized I have a couple options here re. powering my VFO 122
> for my Viking II (to be re-capped etc) .. I have  scrapped Ranger chassis with
> transformer and choke if I was to build a robust over-kill p.s. from that.  I
> also have an old Heath HP 20 utility power supply for 300 v and 6.3 filament I
> can re-cap. Or an Heath HP-23 that has 300 v, but which I would have to use a
> separate 6.3 filament transformer  with (have those I am sure in the junque
> somewhere) since the HP23 has only 12 volt filament.
>
> In any case, I think I have some options re. supply for the VFO 122, but I am
> curious since I've yet to see real full details as to the limitations of using
> the power out of the Viking II octal plug supply.
> I do only do CW, if the juice required for running AM runs into the picture
> somehow.
>
> Oh, and while I do appreciate advice I can get here, I don't have real fear on
> the Viking II project - I need to enumerate the caps I need for that and some
> other likely projects so I can do a minimum-order threshold order. I do have a
> friend near-ish me (couple hours drive) who I think I can do a walk thru of the
> Viking II with..he is pretty adept at stuff like that so I figure if we do a
> visual walk thru of what's what and what is of import and all that once the
> Pandemic has subsided come end of summer (vaccinations in effect) a few beers
> for him (less for me, I'm driving home..) I can allay some of the jitters and
> get a decent working radio.. knock wood. Slow and steady at the helm, cap'n.
> tnx
> Brian VE3HI
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