[Milsurplus] Milsurplus Digest, Vol 92, Issue 12
Walter Treftz
sjotrollet at yahoo.com
Sat Dec 10 16:01:03 EST 2011
Anyone interested in a pair of VT-4C tubes (removed from an operating Class B modulator for a KW
rig)?
Also have a BC-375 tuning unit that might or might not e complete.
Both are from an estate and entertaining best offers plus postage. Pix and full desc available on the TU
73
Walt (N4GL)
________________________________
From: "milsurplus-request at mailman.qth.net" <milsurplus-request at mailman.qth.net>
To: milsurplus at mailman.qth.net
Sent: Saturday, December 10, 2011 12:01 PM
Subject: Milsurplus Digest, Vol 92, Issue 12
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Today's Topics:
1. Re: BC-375 / BC-191 Owners: (Clare Owens)
2. The Invisible War- Vol 2 (Ralph Cameron)
3. Re: BC-375 / BC-191 Owners: (David Stinson)
4. Re: [Vintage-Military-RADAR] Connector History
(COURYHOUSE at aol.com)
5. Re: National R-1230 countermeasures receiver (HL)
6. Discovering Old Mail: First USA Jet Flight - October 1942
(David Stinson)
----------------------------------------------------------------------
Message: 1
Date: Fri, 9 Dec 2011 13:17:49 -0500
From: Clare Owens <clare.owens at gmail.com>
Subject: Re: [Milsurplus] BC-375 / BC-191 Owners:
To: David Stinson <arc5 at ix.netcom.com>
Cc: boatanchors at theporch.com, ARC-5 List <arc5 at mailman.qth.net>,
milsurplus at mailman.qth.net
Message-ID:
<CAFdOJ7Pe=ET0d8u8U==X=GJXYoAn2h-t11=hkAAikC2SOLqX=g at mail.gmail.com>
Content-Type: text/plain; charset=ISO-8859-1
Ah Ha! Expanding your horizons past the 6BQ5 subs for the VT-25/52, eh?
Sounds interesting, especially since:
Most of my 211s show signs of partial or complete loss of getter.
My PE-73 dynamotor was stripped and just about destroyed by a ham and the
mice in his garage but my '375 is really in good shape (not from same ham).
I'm not all that keen to shoot 1KV to a piece of 65 year old equipment.
My entire set of equipment is high and dry in a second floor bedroom, so
has been enjoying full HVAC comfort ever since I received them about 20
years ago.
So, what's the scoop?
Thanks,
Clare N2RJB
On Fri, Dec 9, 2011 at 11:18 AM, David Stinson <arc5 at ix.netcom.com> wrote:
> First: I'm not selling anything with this post. ;-)
>
> Many of you reading this have a BC-375 or BC-191 sitting in the
> garage/barn/basement (wet! ACK!) that you'd enjoy bringing to life,
> but it came with no tubes and you don't have a zillion bucks to buy
> them. If you could tube the set and get it running without
> modifications for less than $100 worth of tubes, would you make the
> effort? If the subs worked well but provided about half the normal
> output (and had an easier power-suppy requirement), would you be
> interested? If not this, what would it take to motivate you to
> dust-off this great old transmitter and get it glowing?
>
> 73 DE Dave AB5S
>
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------------------------------
Message: 2
Date: Fri, 09 Dec 2011 13:33:50 -0500
From: Ralph Cameron <ramcam at magma.ca>
Subject: [Milsurplus] The Invisible War- Vol 2
To: milsurplus at mailman.qth.net
Message-ID: <4EE2548E.2090901 at magma.ca>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
I have a copy of ."The Invisible War", Vol.1, produced by Association of
Old Crows. It appears to be no longer in print ( video tape). is there a
Vol. 2 covering "The History of Electronic Warfare"?
I'd be interested. Thanks
Ralph
VE3BBM
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------------------------------
Message: 3
Date: Fri, 9 Dec 2011 12:43:16 -0600
From: "David Stinson" <arc5 at ix.netcom.com>
Subject: Re: [Milsurplus] BC-375 / BC-191 Owners:
To: <milsurplus at mailman.qth.net>, <boatanchors at theporch.com>, "ARC-5
List" <arc5 at mailman.qth.net>
Message-ID: <851EFA355FBF403BAC53DEDC8983748F at DaddyPC>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
----- Original Message -----
From: Clare Owens
> So, what's the scoop?
Thinking of taking this on as a "side project" while working on the
RAAF set, but only if there's some interest.
Seems to be, sooooo...
73 DE Dave AB5S
------------------------------
Message: 4
Date: Fri, 9 Dec 2011 23:58:09 -0500 (EST)
From: COURYHOUSE at aol.com
Subject: Re: [Milsurplus] [Vintage-Military-RADAR] Connector History
To: w7qho at aol.com, Vintage-Military-RADAR at yahoogroups.com,
jfor at quikus.com
Cc: milsurplus at mailman.qth.net
Message-ID: <7248.27b2af91.3c1440e1 at aol.com>
Content-Type: text/plain; charset="US-ASCII"
strange horn x band seems to be antenna mounted in gimbal odd stand...
says as-592/gpm-14
that is it? had it for years
------------------------------
Message: 5
Date: Fri, 9 Dec 2011 21:16:22 -0800
From: HL <zbyte at comcast.net>
Subject: Re: [Milsurplus] National R-1230 countermeasures receiver
To: milsurplus at mailman.qth.net
Message-ID: <944EE2FA-4B65-4615-94E5-F291B4F97C1A at comcast.net>
Content-Type: text/plain; charset=us-ascii
Many, many thanks to those in the Milsurplus group who responded with recommendations and to Francesco Ledda with some critical PDF pages.
Progress report: With the help of a partial schematic, I traced all wires of the ten-pin power connector and then carefully applied voltages to confirm each traced connection. Everything worked; all tubes lit up; and the receiver came to life. However, sensitivity was quite low, so, now every stage will have to be checked--a slow process to begin early next year --IF I can find a complete readable schematic. Meanwhile, for anyone who might own this remarkable receiver, here are the Amphenol (Type 18-1) pin IDs with voltage/current measurements. Note that other versions of this receiver may have different pin allocations.
Pin A 115VAC (for the rear fan if installed)
Pin B 115VAC (for the rear fan if installed)
Pin C 175VDC (B+ at 250mA)
Pin D 7.3VAC 5.5A (reduced by internal resistor to 6.3VAC)
Pin E 7.3VAC 5.5A (reduced by internal resistor to 6.3VAC)
Pin F no connection
Pin G no connection
Pin H Ground
Pin I 5VAC 330mA (for receiver lamps, other side grounded)
Pin J 18VAC 730mA (reduced to regulated 6.3VAC for V301 filament, other side grounded)
Again, if anyone has any readable schematic pages for either the R-1125/FLR or the R1230/FLR, please let me know. I am desperate!
73 Hal KK6HY
Website for receiver: http://online.sfsu.edu/~hl/R-1230FLR.html
------------------------------
Message: 6
Date: Sat, 10 Dec 2011 10:02:19 -0600
From: "David Stinson" <arc5 at ix.netcom.com>
Subject: [Milsurplus] Discovering Old Mail: First USA Jet Flight -
October 1942
To: "ARC-5 List" <arc5 at mailman.qth.net>, <milsurplus at mailman.qth.net>
Message-ID: <3E2E667D95824681A83D6C86C547444C at DaddyPC>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
Hello Larry.
I was going over old mail and found this from a year ago.
Must have rattled-around inside my empty head and
fallen out of my ears at the time:
----- Original Message -----
From: "LARRY D GODEK" <telegrapher at q.com>
Subject: [Milsurplus] Video: First USA Jet Flight - October 1942
About 5:17 into the video you'll see a ground controller type
communicating with the P-59 via a triple command set transmitter
arrangement mounted in a box out along the flightline or desert
someplace. Can't see what the receiver(s) is/are because the inside
of the box is shaded. Any guesses? Pretty neat huh?
> <http://videosift.com/video/Americas-First-Jet-Flight-October-1942>
-----------------------------
I have a book documenting that the P-59 was equipped
with SCR-274N, including photos of the control boxes
in the cockpit. If you look behind the pilot at 1:07
in your video, you'll see the rear of a 274N RX rack
and the dynamotors.
And to answer your question: I believe the receivers were
274N, because the reflections under what he's tuning
match the bright spots on a receiver rack. Plus we
have photos of similiar installations.
How about that "door bell" solution to the sticking
gauges problem? Men after my own heart!
73 Dave AB5S
------------------------------
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