[ARC5] Help Needed

[Clare Owens]

Well, thank you for the thank yous but I've come to the conclusion that I
have too much of some things and dynamotors are among those things.

Which can be a good thing but only occasionally - today is one such
instance.  I have been running the DM-28-J today and after an hour or so
it's become quite noisy again.  I guess the rust extended to the bearings
and I'm not equipped to swap them out.

So I'm changing my offer to a DM-28-B which also is minus its filter base,
has smooth paint rather than wrinkle, has rather shorter leads for some
reason - those darned hams :-) - and runs smooth as silk.  I also know
where this came from, the Indianapolis Hamfest back in about 1995, when I
scavenged it from an empty table as the fest was ending.  The tag says I
cleaned and greased the bearings back in 2011.

By the way, Taigh, if you go way back we were having a conversation about a
radio that I have that has the PV-1/PV-2 stamps on it.  It's a CBY-46145,
.52 to 1.5 Mc and I know its history.  It was surplussed by Calspan Corp
(ex Cornell Aeronautical Labs) back in about 1970.  I bought it in Hamburg,
NY from a place called East Coast Electronics.  As I recall the only mod
they made to it was the use of one modern cap to sub for one of the famous
canned caps that had failed.  I never have powered it up on the 48V power
supplies the way I usually do.  You and I were talking about a trade and as
i recall the ball was in your court.  How did the Harpoon restoration work
out?  I haven't been to your web site in a long while.

Clare  N2RJB


On Mon, Nov 24, 2014 at 4:32 PM, Taigh Ramey <taigh at twinbeech.com> wrote:

> Good for you Clare. Santa does exist!
>
>
> > On Nov 24, 2014, at 5:37 PM, Clare Owens <clare.owens at gmail.com> wrote:
> >
> > Hi Joel,
> >
> > Last March at an estate auction I was able to buy a Very nice BC-348R
> that
> > had been fixed up and converted to AC by a real craftsman, the retired
> > chief engineer from station WBT.  It came with what is apparently the
> > dynamotor from which the filter box for the AC supply was taken, a
> > DM-28-J.  It has some rust on the outside of the frame but the labels and
> > the interior are nice.  The guy even left the four mounting screws in the
> > mounting bracket.  I cleaned and regreased the bearings in March and it
> > sounded and ran OK then but not perfectly.  When I saw your email
> yesterday
> > I went over to the shelf, got the dyno and tried it out.  It sounded too
> > noisy so I cleaned the bearings again this morning and regreased it.  Now
> > it sounds like a normal WW II dynamotor (well, except for the SCR-522
> > dynos, whose sound is like music to my ears - but that's another story)
> and
> > produces 225V with 24.5V @ .75A input, no load.
> >
> > To make this long story short, send me your address and I'll pack up the
> > dynamotor and send it to you, no charge.  I'll never use it and you will
> so
> > it belongs with you.  Early Black Friday gift.
> >
> > Clare  N2RJB
> >
> >
> >
> >
> > On Sun, Nov 23, 2014 at 3:50 AM, Joel R Roberts <
> joelroberts001 at comcast.net>
> > wrote:
> >
> >> Greetings everyone, and happy Holidays. I was recently given a BC-348-R
> >> that looks to be internally intact, but is of course missing the
> Dynamotor
> >> and Filter assembly, and also the metal case. Does anyone know where I
> can
> >> find the values for the two filter chokes in the assembly? As every one
> of
> >> the complete Dynamotor/Filter assembly's are scarce, and those we
> >> occasionally see on the bay are quickly driven out of my price range,
> >> similar to the Modulator/Dynamotor sets that a lot of us need, I am
> going
> >> to build up a substitute using the manuals and schematics that I
> currently
> >> have. If anyone has an extra case or knows the value of the chokes, let
> me
> >> know. I really appreciate the help. Thanks and 73's to all,,,,,,,Joel
> >> KB0FPT
> >>
> >> ---
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