[R-390] Autotune ARR-15
Tom M.
courir26 at yahoo.com
Sun Apr 9 17:00:34 EDT 2006
I had a ARR-15 with good autotune.
The motor was made by Hamilton Beach so I could mix beverages with it and tune
the radio.
Roy Morgan has it now. How is my radio Roy?
Tom
--- Barry Hauser <barry at hausernet.com> wrote:
> I have a couple of '391's and had the autotuners working -- for a short
> while. If I were to let one of them just run on (I pulled the plug), it
> would probably self-modify the 10-turn stops to infinite-turn and
> theoretically tune the RF deck to UHF, or maybe even Wi-Fi ;-)
>
> >From what I've heard, most of the '391's never, or hardly ever, had their
> autotuners in use. Of course, they require a heavy-duty 28 volt DC supply,
> but there's another thing. The motor is fairly high rpm and geared down.
> Sounds like a mixmaster or an A/C (not rechargeable) drill -- and no
> wonder -- motor is courtesy of Hamilton-Beach. The PTO, it's gearing and
> the RF deck is stock, but the R-390/URR -- "the man's radio" -- has somewhat
> heavier components. Even so, it puts some stress on things.
>
> In addition, it makes a racket and quite a bit of vibration -- not too kind
> to tube elements and some other components. Not great for coils and
> trimmers, nor probably crystals, for that matter. An even greater
> consideration with mechanical filters, in the case of an "A" rendition.
> Probably a good idea to have a few spares of those and maybe a dozen extra
> ballast tubes on hand.
>
> I don't know if such considerations helped put the cabosh on the R-391A such
> that only 2 were made -- or did even those get fully completed? While the
> autotune is an interesting curiosity -- and does work when it works on the
> '391 -- it isn't all that practical.
>
> Downright scary when you fire one up. ("Omigosh! What's that thing doing
> to my radio! So much for that RF deck alignment I just did!")
>
> If you want to get an idea, just remove either or both of the MC and KC
> knobs from your R-390A or R-390, chuck up one of the shafts in your old 3/8"
> Black 'n Decker variable speed drill, and give 'er a spin.
>
> Barry
>
>
>
>
> ----- Original Message -----
> From: "Les Locklear" <leslocklear at cableone.net>
> To: <paul at pdq.com>; <r-390 at mailman.qth.net>
> Sent: Sunday, April 09, 2006 10:52 AM
> Subject: Re: [R-390] wow... the R-391A does exist
>
>
> > The existence of that particular experimental R391A has been known for a
> > while. There more than likely not a "small handful" to be found anywhere.
> > This prototype and possible one more exist.
> >
> > All of the R390X, R-725 were originally built with the X or XC designator.
> > Looks rough as 40 grit sandpaper to me. YMMV
> >
> > Les Locklear
> > Monitoring Since '57
> > Located On the Gulf of Mexico
> > Gulfport, MS.
> > http://www.hammarlund.info/homepage.html
> >
> > ----- Original Message -----
> > From: "Paul H. Anderson" <paul at pdq.com>
> > To: <r-390 at mailman.qth.net>
> > Sent: Sunday, April 09, 2006 8:38 AM
> > Subject: [R-390] wow... the R-391A does exist
> >
> >
> >>
> >> I would not normally post 'seen on ebay', but this is absolutely
> >> astounding.
> >>
> >> There's an R-391 XC-2 radio on eBay - item # 9710078628.
> >>
> >> I think I about had a heart attack when I saw it (I'm a big fan of
> >> R-391's).
> >>
> >> I asked the seller to list more pictures of the autotune area - hopefully
> >> we can learn more about it.
> >>
> >> No relationship to the seller...
> >>
> >> Paul
> >> _____________________________________________________________
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> >>
> >> --
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> >>
> >>
> >
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>
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