[R-390] Radium dials and 3AT7 'unubtanium" ballast tube--query for the group

Sun, 18 May 2003 10:49:52 -0400

Dave

Tsk Tsk -- you really should make it your business to read ALL of the posts.
Priorities, man!

Anyway, the meters were made by a variety of manufacturers like Dejur,
International, Simpson, etc.  There were a lot of meters made in the same
form factor, but with different construction methods.  Chances are, if
you've seen more than one R-390 or R-390A, you've seen more than one mfr's
work.  The carrier meter and the audio meter in a particular receiver may
have come from different sources.

Somehow doubt if you will find a catalog listing for something that's in
production.  Some years ago, I think a list member looked into getting more
meters made up and it was either impossible or the cost would be out of
sight.

There are some NOS meters around, but most are not electrically correct --
higher DC resistance, etc.

Also, I think that general case style was pretty much mil only.  Not sure.

Don't know about the squech circuit, except that the non-A, and R-391 comes
with one built in.  So, question might be, how many R-390/391 owners
actually use the squelch much.  I've only used it when checking to make sure
it worked.

Barry

----- Original Message -----
From: "Dave and Sharon Maples" <[email protected]>
To: <[email protected]>
Sent: Sunday, May 18, 2003 9:53 AM
Subject: RE: [R-390] Radium dials and 3AT7 'unubtanium" ballast tube--query
for the group

> All: At the risk of being extremely stupid (again) [I try to follow what
> goes on on this list, but I have had to can a bunch of messages without
> really reading them due to other pressures], I am wondering who made the
> meter movements that fit in the R-390A holes?  I have checked some current
> meter mfrs and have come up dry so far.  I'm probably just looking in the
> wrong place...
>
> Side note to list: What value do you suppose folks would put on a
> pretty-reliable voice-activated squelch circuit for monitoring SSB (e.g.
> MARS, CAP, etc.)?  It would be an add-on between receiver and speaker.  No
> DSP in this one, just some analog filtering and decision circuitry,
> patterned in part on some Motorola circuitry I saw a while back.
>
> Thanks,
> Dave  WB4FUR
>
>
>
> -----Original Message-----
> From: [email protected] [mailto:[email protected]]On
> Behalf Of Gene Beckwith
> Sent: Sunday, May 18, 2003 12:12 AM
> To: Richard Biddle
> Cc: [email protected]
> Subject: Re: [R-390] Radium dials and 3AT7 'unubtanium" ballast
> tube--query for the group
>
>
> Gents,
>
> Tom's kits were excellent, but I think he has moved emphasis away from Ham
> Radio
> the past couple of years...into some other intense hobbies...
>
> Best to contact him by snale mail...His address is "probably" ok on
> QRZ....but
> haven't seen him in a year...last time was at Findley Ohio Ham Fest...he
was
> reducing his Ham Radio parts and pieces at that time...
>
> Hope this helps...the art work was superb...
>
> 73,
>
> Gene
>
> W8KXR
>
> Richard Biddle wrote:
>
> > Once upon a time, way back in 1997, Mr. Thomas W. Bowes, KK8M, put
> together
> > an R390/R390A meter kit.  It consisted of two surplus meters and, the
> really
> > neat part, stick on decals with A++ grade meter scales.  These look much
> > better than the originals.
> >
> > I tried to contact him last year but the email address I had didn't
work.
> > If he still has the art work and the desire, perhaps someone could
> resurrect
> > the project.
> >
> > 73 de Richard, W5SRB
> >
> > _______________________________________________
> > R-390 mailing list
> > [email protected]
> > http://mailman.qth.net/mailman/listinfo/r-390
>
>
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