[R-390] R-390 restoration

[Michael Young]

Someone tell me where I can find the detailed information on the VR
circuitry???

TNX
mikey
----- Original Message -----
From: "Barry Hauser" <barry@hausernet.com>
To: "DAVID MEDLEY" <davidmed82@msn.com>; <r-390@mailman.qth.net>
Sent: Thursday, August 08, 2002 9:09 PM
Subject: Re: [R-390] R-390 restoration


> Dave wrote:
> <snipped>
> >The 6082 is another matter end  I would love to see a thread develop
> towards replacing them with >something readily available. I think there
have
> been thoughts given to solid stateing the VR circuitry but >that would be
a
> major departure from the original and spoil the radio as an item I
believe.
>
> Not really Dave, not all that difficult or a major departure ...
>
> Issue #52 of the Hollow State Newsletter has an article by Dr. Jerry
> analyzing a solid stated VR circuit I stumbled upon in an R-391.  This had
> apparently been done years ago, and it has been operating well since then
> from what I can determine.  Among other things, we compared the regulation
> performance over a range of AC supply voltages from 95 to 125 and the 180
B+
> was comparable to most of the stock non-A's we polled -- and was also in
> spec.  Only a few components -- two transistors, one or two zeners and a
few
> other parts can replace the 6082's.  This is one partial solid state
> conversion that's worthwhile in view of the declining availability of
> 6082's -- though some are still out there -- and the damaging heat they
> generate.  So, in an odd sense, it's in the best interest of preserving
the
> non-A -- so it can continue to operate on tubes dammit. (oooops)  Also, I
> might add, the mod is reversable.
>
> Someone has replicated the circuit as a plug 'n play as recommended in the
> article.  Piece of perfboard with one or two octal sockets that just plugs
> into the spot where the two 6082's normally reside.  He's done this with
> currently available solid state components. (To be reported as an update
in
> a later HSN.) The '391 this was derived from was converted some years ago
> and has old part numbers that may not be available as such anymore.  This
> raises another issue about solid state stuff which I will rail about in
> another post.
>
> Barry (Editor, HSN)
>
>
>
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