[NJARC] Uncle Bill Henderson's Radios :) :) :)
Scott Roberts
ng19delta at yahoo.com
Sat Oct 27 23:38:44 EDT 2007
Joe- I'm not sure about the cathode modulator you
mention: But I should have access to the modulator
with dynamotor next time I visit, hopefully...
The ARC-5 sets I have are:
BC-453B (Rec.) 10-550 kc
BC-454B (Rec.) 3-6 mc
BC-455B (Rec.) 6-9.1 mc
BC-457A (Tx.) 4-5.3 mc
BC-458A (Tx.) 5.3-7 mc
I have none of the control cables or heads, but do
have the Bendix connectors for the mounts!
With regard to the power unit, the 450 voltage showing
was at the point the power went into the radio: some
of the tubes were carrying that voltage! There was no
further power reduction I could find. I checked the
voltage charts. Pretty sure the transformer is cooked:
lotsa wax lying about. Also, the resistor I mentioned
is about 1 3/4" by 3/8, wirewound hollow resistor,
showing 990 ohms on the 2000 scale on my DMM. I want
to try to keep as much of the original design intact
if feasable... I found a nice solid state design
online, but I am a tubie- want to keep that tube in
there... :) I will try to e-mail the schematic once I
finish diagramming it...
Yep- BC-375 is the one I meant. He has about a dozen
tuners- most new in box, some new in dilapidated
boxes, but new inside. Also some of the tubes...
Having found how involved that trasmitter is, I'd
probably be happy with a smaller ARC based setup... I
still need help finishing up tuning the SX-111 Mk 1-
It is driving me nuts! At least I am good at
soldering...
Scott
--- JOE CRO <n3ibx at verizon.net> wrote:
> Visit our web site - See http://www.njarc.org
> _______________________________________________
> Scott - The correct transmitter used in the
> B-17/B-24/B-25 'Mitchells, etc
> was the venerable (and at one time plentiful)
> BC-375-E, originally developed
> by GE in the mid '30's. They used a 10Y as a speech
> amp, and then a quad of
> VT4-C's (211's) one for the oscillator, two as a
> modulator, and a single one
> as the final tube for about 75-95W or so output. If
> you get one, you MUST
> use the GE VT4-C in the oscillator, the others can
> be Chinese or whatever
> 211's. A good oldfashioned #10 will work FB for the
> 10Y.Even a 801 if you
> can't find a 10. The BC-375 was a MOPA (Master
> Oscillator Power Amplifier)
> type rig. The ART-13 was a class B plate modulated
> transmitter.
>
> Due to the rather esoteric tubes (per audiophiles) a
> lot were scrapped for
> parts, robbed of their tubes, etc. There was a time
> not too long ago that
> nary a "Ham" in this country didn't have some
> component from a BC-375 in his
> shack.
>
> You can virtually "fire up" a BC-375 on a ART-13
> supply. The voltages are
> close.
>
> Unfortunately, I don't have a spare BC-375, but will
> keep my eyes and ears
> peeled for one for you. If I hear of any available,
> I'll just put you
> directly in touch with the seller, and you two can
> "duke it out" over the
> price. Ditto on a ART-13. Obviously, the cheaper,
> the better! I should have
> some form of BC-375 tuning unit I can give you
> should you find one without
> one.
>
> Good going on the ARC-5 setup! It sounds like you
> have the complete set. Do
> you have the plate or (less common) cathode
> modulator for the set?
>
> Very Best Regards,
> Joe Cro N3IBX
>
> ----- Original Message -----
> From: "Scott Roberts" <ng19delta at yahoo.com>
> To: "New Jersey Antique Radio Club"
> <njarc at mailman.qth.net>
> Sent: Saturday, October 27, 2007 8:42 PM
> Subject: Re: [NJARC] Uncle Bill Henderson's Radios
> :) :) :)
>
>
> > Visit our web site - See http://www.njarc.org
> > _______________________________________________
> > Joe- I would like to get the proper transmitter-
> Got a
> > spare? Unfortunately, after my friend's
> grandfather
> > passed away, the box for the big aircraft
> transmitter
> > for a B-17, which took the interchangeable tuning
> > units, was not recovered in time, and apparently
> > tossed by the new owners of his house... We have
> most
> > of the tuner units- new in the boxes, for the most
> > part!
> >
> > I have an ARC-5 set, two transmitters, three
> > receivers, on their respective mountings, but I
> > haven't checked into their operation yet... Also a
> > pair of SCR 522 transmitters.
> >
> > Scott
> >
> >
> > --- JOE CRO <n3ibx at verizon.net> wrote:
> >
> >> Visit our web site - See http://www.njarc.org
> >> _______________________________________________
> >> Scott,
> >> If you enjoy your BC-348 rx, you NEED
> it's
> >> matching transmitter,
> >> namely the autotune "ART-13". It uses a single
> 813
> >> modulated by a pair of
> >> 811's. The original DY12 dynamotor would be great
> to
> >> have as it's power
> >> supply, but you can whip up a 28V/1250V supply
> that
> >> would work FB. Both the
> >> BC-348 and ART-13 were standard equipment in the
> >> famous B-29 "flying
> >> fortress". If you'd like to see one in operation,
> >> let me know and you're
> >> welcome to stop over and do so, and get a
> "gander"
> >> at the homebrew supply I
> >> use with it. Everything is built into a mechanics
> >> tool cart, including all
> >> of the meters.
> >>
> >> Once you get "bit" with playing with a ART-13,
> >> you'll be hooked. Think of
> >> having a medium power AM/CW/MCW (modulated CW)
> 100W+
> >> class rig that you can
> >> preset everything from loading and tune, down to
> the
> >> frequency. All you do
> >> is flaick a switch and within 24 seconds (per
> >> milspec) you'll be ready to
> >> modulate the aether!
> >>
> >> Mod-U-Later, and keep on having fun with stuff
> that
> >> glows!
> >>
> >>
> >> Joe Cro N3IBX
> >>
> >> ----- Original Message -----
> >> From: "Scott Roberts" <ng19delta at yahoo.com>
> >> To: "New Jersey Antique Radio Club"
> >> <njarc at mailman.qth.net>
> >> Sent: Saturday, October 27, 2007 12:09 AM
> >> Subject: Re: [NJARC] Uncle Bill Henderson's
> Radios
> >> :) :) :)
> >>
> >>
> >> > Visit our web site - See http://www.njarc.org
> >> > _______________________________________________
> >> > Well, the BC-348Q works reasonably! Had a bad
> >> 5Y3GT in
> >> > the power supply(RCA homebrew in place of the
> >> > dynamotor) which I replaced with a 5V4. Does
> not
> >> fit
> >> > properly- but works out of the case, which is
> good
> >> for
> >> > testing. Listened to all the bands, figured out
> >> how
> >> > everything seems to work.
> >> >
> >> > Was flipping, about to switch off, and hit a
> >> station
> >> > at 3.225 playing Glenn Miller music. Something
> >> Just
> >> > Right about that- Glenn Miller playing on a
> WWII
> >> > bomber radio... :)
> >> >
> >> > Scott
> >> >
> >> >
> >> > --- Scott Roberts <ng19delta at yahoo.com> wrote:
> >> >
> >> >> Visit our web site - See http://www.njarc.org
> >> >>
> _______________________________________________
> >> >> At long last, I have arrived home with an
> >> assemblage
> >> >> I
> >> >> had been considering for a while, and waiting
> to
> >> >> receive since my Aunt asked me last month if I
> >> knew
> >> >> anybody who would want... My late Uncle Bill
> >> >> Henderson's Ham and SW radios!
> >> >>
> >> >> Uncle Bill had been a "Mickey Man", or radar
> >> >> operator/mechanic with the 8th Air Force in
> >> England.
> >> >> >From what I understand, he made a couple
> combat
> >> >> missions, but usually was in the repair shop,
> >> fixing
> >> >> early Radar. After the war, he took a job with
> a
> >> >> small
> >> >> tech firm called "RCA" in Lancaster, Pa.
> Involved
> >> >> with
> >> >> the development of color television, he
> remained
> >> >> with
> >> >> the company until the mid 1980s. During the 35
> >> years
> >> >> with RCA he made many trips overseas,
> including a
> >> >> few
> >> >> to Taiwan, Mexico and Russia(before we won the
> >> Cold
> >> >> War), to instruct people in how to work with
> >> color
> >> >> tv
> >> >> and other tubes. Uncle Bill was always a nice
> >> >> country
> >> >> boy from Paris, Arkansas- his drawl never
> left,
> >> and
> >> >> was my favorite uncle growing up... After his
> >> >> youngest
> >> >> son (of 8 children!) passed away in an auto
> >> >> accident,
> >> >> he was never quite the same; he developed
> >> >> Alzheimers,
> >> >> and passed away in 2002. I still think of him
> >> from
> >> >> time to time, and wish I had the chance to
> talk
> >> >> radios
> >> >> with him now.
> >> >>
> >> >> Now that I've introduced him, let me tell you
> >> about
> >> >> the radios which my Aunt Mildred passed on to
> me
> >> >> from
> >> >> his "radio shack", long cold now, and in need
> of
> >> >> TLC.
> >> >> All have a heavy coat of dust, but I am pretty
> >> sure
> >> >> they will clean up nicely. I have not looked
> up
> >> what
> >> >> most of these do yet- if anyone can let me
> know
> >> >> their
> >> >> true potential, I'd appreciate it...
> >> >>
> >> >> To start with, a Hallicrafters "Sky Champion",
> >> which
> >> >> appears to be a receiver;
> >> >>
> >> >> Another Hallicrafters set, a "Super Sky
> Rider",
> >> >> which
> >> >> appears to be a transmitter/receiver;
> >> >>
> >> >> A Heathkit HX-20, which also appears to be a
> >> >> transmitter/receiver, (along with a homebrew
> >> power
> >> >> supply for it);
> >> >>
> >> >> A Johnson Messenger 250 CB radio;
> >> >>
> >> >> A brown bakelite or plastic RCA wedge shaped
> wall
> >> >> speaker;
> >> >>
> >> >> A nice CW key, looks like another nice one I
> >> have,
> >> >> with ball bearing pivots;
> >> >>
> >> >> And last, but not least, the one I had really,
> >> >> REALLY,
> >> >> been hoping for, a Wells-Gardner BC-348Q, with
> a
> >> tag
> >> >> marked "Equipment Development Lab", and which
> had
> >> >> been
> >> >> given to him after he retired, by the RCA
> plant
> >> when
> >> >> they were cleaning out their old storage.
> Having
> >> >> looked inside this one quickly, I have high
> hopes
> >> >> for
> >> >> some nice listening.
> >> >>
> >> >> I intend to use these in my own "radio shack",
> >> along
> >> >> with my Hallicrafters HT-37 & SX-111 Mk. 1
> >> >>
> >> >> Thanks for reading along- hope you enjoyed the
> >> >> story:
> >> >> I would have shown one of the radios, and told
> >> all
> >> >> this at RCA show and tell last month, but
> some
> >> >> unforeseen circumstances occured.
> >> >>
> >> >> Scott
> >> >>
> >> >>
> >>
> __________________________________________________
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> >> >
> >> >
> >> >
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