[R-390] [Fwd: R-390 Replacing 6082 With Splid State]

[Barry Hauser]

Hi Al & gang:

The whole shebang is the subject of Issue #52 of The Hollow State
Newsletter.  Dr. Jerry had been working out a replacement (on paper), then I
happened to acquire an R-391 (electronically the same as the non-A) which
was heavily solid-stated, including a fairly simple replacement for the
6082's.  This used a couple of zeners and a dual Darlington pair.  A fed Dr.
J. the info to sort of "reverse engineer" the circuit.  He authored the
article and included a list of suitable currently available transistors.

While the mods on this particular R-391 were not done reversably, the 6082
replacement circuit could be built on a small board that would fit right in
the 6082s' "cubicle" with a single octal plug making the connections -- or a
few hard wired leads..

You can get a copy from Ralph Sanserino for $2.  His email address is
sanser@gte.net

Or, if you're in a hurry, being editor of HSN, I have an emailable copy on
file right here I can shoot over to you.  However, there's a catch -- an
underhanded sleasy weasel deal of the kind the Fifth Estate may sometimes
arrange.  You have to build a reversible plug 'n play, then write it up
(with my help) for a followup in a later issue.  I'm making this big time $2
bribe because right now I need authors more than subscribers.

So Al, whaddya say, hmmmmm?

Barry






----- Original Message -----
From: "Al Solway" <beral@videotron.ca>
To: <r-390@mailman.qth.net>
Sent: Tuesday, February 05, 2002 6:20 PM
Subject: [R-390] [Fwd: R-390 Rplacing 6082 With Splid State]


>
>
>
>  To All,
>
>  I refer to The FAQs, Pearls Of Wisdom/Power Supply, compiled by Wei-Li.
>  This is a compilation of information by subject that is easy to access.
>
>  Http://www.r-390a.net/pearls.htm
>
>  Within the power supply section, around the April 2000 time frame or
>  about half way through the P/S section. Dr Gerald Johnson describes a
>  solid state replacement that he has "scratched out on paper with
>  components chosen. Its not been tested." Dr Jerry indicates that his
>  circuit would use a couple of IRF820s three zeners and a TL431A1Z plus
>  some resistors and caps. There is additional follow-up discussion from
>  Barry Hauser where he describes a solid state replacement for 6082s in
>  an 391 he had acquired.
>
>  I recall that within the past few months there has been some talk on
>  this topic but can't seem to find anything specific on the circuit.
> What
>  I would like to know is where to get more info, a schematic and a list
>  of parts. Also has any body tried Dr. Gerry's circuit.
>
>  I am restoring an R-390 and have decided to go the solid state route
> for
>  the 26Z5 and 6082 if I can get the above information. I have ordered
>  6080s to replace the 6082. I have selected a filament transformer, the
>  Magnetek VPP12-4400 or the Hammond 183K12. If everything works out as
>  planned all this will be reversible using plug and play modules.
>
>  I know all this has been covered before but discussion would be
>  appreciated.
>
>  Al
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>