[Boatanchors] outboard power supply for EF Johnson VFO 122

[William Cromwell]

Hi,

Brian, don't have a 12AU6? I can send you one.

73,

Bill KU8H

bark less - wag more

On 4/27/21 12:50 AM, K9FFK wrote:
> 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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