[Milsurplus] Power Supply Requirments for the RBM HF Receiver

[Mark K3MSB]

As does mine.....

Mark K3MSB

Sent from my Android phone
On Aug 20, 2014 7:24 PM, <hwhall at compuserve.com> wrote:

> My RBM set AC power supply has a data plate that says 12 vac 2.9 A and 205
> V 0.076 A. I also have an RBM-3 receiver whose data plate says 12 v ac/dc
> and 205 vdc 0.07 A. Hope that helps.
>
>
>  Wayne
> WB4OGM
>
>
>
> -----Original Message-----
> From: WA5CAB--- via Milsurplus <milsurplus at mailman.qth.net>
> To: ianmwilson73 <ianmwilson73 at gmail.com>; w7cj <w7cj at yahoo.com>
> Cc: milsurplus <milsurplus at mailman.qth.net>
> Sent: Wed, Aug 20, 2014 1:58 pm
> Subject: Re: [Milsurplus] Power Supply Requirments for the RBM HF Receiver
>
>
> Terry,
>
> Besides the 11 tube filaments @ 150 mA there are also two dial lamps.  I
> didn't look them up but certainly no more than 150 mA.  So 2 A @ 12.6 V is
> still adequate.
>
> The odds of ID-ing the RBM model number  are fairly slim.  There were six
> "models" (RBM through RBM-5) but the Navy SOP was that additional orders
> usually got the model number incremented.  Externally, RBM through RBM-4
> look
> the same.  The HF receivers are all NT-46077.and all have a small box on
> front
> with a calibration roll chart inside.  Some were made by Westinghouse (CAY)
> and some by Stromberg-Carlson (CCT).  The RBM-5 HF receiver is CAY-46077A
> and has a thinner box with calibration cards.  So the cal chart or cards
> (assuming someone didn't remove them) would determine RBM-5 or RBM through
> RBM-4.  There were a few minor circuit changes to reduce RF oscillator
> radiation
>
> but as they were supposed to have been made to all sets RBM through RBM-3
> and were standard on RBM-4 probably wouldn't help any.  The only way to
> possibly pin it down a little closer would be if you can find evidence
> inside as
>
> to whether the receiver was built by CAY or CCT.
>
> I do sell a reprint of the final NAVSHIPS manual if you decide that you
> need it.
>
> Robert Downs - Houston
> wa5cab dot com (Web Store)
> MVPA 9480
>
>
> > On Tue, Aug 19, 2014 at 3:15 PM, T. Comstock via Milsurplus <
> > milsurplus at mailman.qth.net> wrote:
> >
> > >I picked up what I believe is a RBM HF Receiver this past weekend,
> > someone
> > >along the way removed the nameplate
> > >and installed a meter.  Because the knobs don’t include the large
> > letters,
> > >I believe that I have a RBM unit, is there a
> > >way to tell which flavor or model I ended up with?
> > >
> > >Using the info from the RBS documentation found on line (no luck with
> > more
> > >than a schematic for the RBM), I found
> > >the power connector pin out and the need for 12.5V and 215V but not sure
> > >on the current requirements for
> > >both voltages.
> > >
> > >Any help would be appreciated, and if someone might know where I can
> find
> > >a nameplate when I make an effort to
> > >attempt a restoration (there is a fear that the hole is too large to
> > cover
> > >with the original nameplate).
> > >
> > >Thanks,
> > >Terry
> > >W7CJ
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