[R-390] R-390 Voltage Regulator

[Bill Hawkins]

IMHO, it depends on whether the radio has collector value or not, and
whether you care about that value or not.

Do anything you want if what you want is a working radio. Solid state
devices subtract the filament power heat from the rest of the radio,
so hack away at the insides.

If you want to keep the set original, use an external regulated power
supply. Remove the rectifier and regulator tubes to prolong life by
reducing heat, but keep them with the covers for the day when other
things become more important, in the hope that the set will still
have collector value when the time comes to sell. Of course, the
external connections to the set have to be reversible.

Regards,
Bill Hawkins


-----Original Message-----
From: r-390-bounces at mailman.qth.net
[mailto:r-390-bounces at mailman.qth.net]On Behalf Of DAVEINBHAM at aol.com
Sent: Thursday, March 24, 2005 11:19 AM
To: r-390 at mailman.qth.net
Subject: [R-390] R-390 Voltage Regulator


I know this is heresy, but considering the scarcity and price of 6082's, has
anyone worked out a solid state regulator circuit for the R-390 ?  It
doesnot
look too difficult to do, but I see no reason to reinvent the wheel if it
has
already been done and is in the public domain.
The reason I ask is that I have just acquired a Collins R-390 from one of my
former graduate students. This radio "died" twenty five years ago and has
been
living in his attic until he recently moved. Just what I need, another radio
project.

Kindest regards,
Dave
****************************************************************************
**
******

> I see what you mean about the 5651's being voltage reference tubes,  they
> can only accommodate  3.5 ma current variation compared to the ones that
I'm
> more familiar with that take on all the current variation by themselves to
> regulate voltage. The manual has a pretty good explanation of this
> circuitry. I suppose considering the price of 6082's,  I should be more
> concerned with treating them with respect than finding a sub for the
26z5's.
> Best regards,  Dan
>

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