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Author Topic: Mystery Hammarlund RX------Prototype?  (Read 21075 times)
W7GIF
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Posts: 126




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« on: April 23, 2013, 02:32:02 PM »

Here's hoping that someone can help me to identify a Hammarlund receiver that I bought many, many years ago. Wish I knew how to post pics here (or on a separate ste, but I don't), so I'll do my best to describe this receiver. If anyone is capable and willing to post pics on this site, I'll be happy to provide the pics if you'll pm me, with your email address.

Front panel: Looks like a black HQ-120 panel was machined out (to provide control legend), and was sandwiched/overlaid onto a gray sub-panel. Has a round S-meter centered between the two dials (legend 1 to 9).
Tube complement: 5U4G, 0C3/VR105, 6C5, 6H6, 6K8, 6SJ7, 4-6SJ7's, 6V6.
Chassis: Five above-chassis aluminum-cased 4mfd/600v, mounted thru the chassis with threaded "headers". All tube sockets are ceramic.
ID plates: The chassis (tube) layout plate has one number engrave on it: "6288", and it's riveted onto the tuning capacitor cover. The ID plate (also riveted) has blank spaces for model number and serial number, but no mumbers stamped or engraved in them.

When I bought this at a hamfest many, many years ago, it was partially disassembled (panel, knobs, and bandspread tuning dial/mechanism removed). I have all the knobs, which look to be HQ-120 knobs, but sadly, I have misplaced the bandspread dial drive (flywheel/pinch roller). It was pretty obvious that the receiver had been disassembled to replace the bandspead dial which has a large area on the outer edge thats "chewed" out, preventing it from being driven by the pinch roller on the drive shaft.

My guess is that it's a prototype during the transition from the HQ-120 to the HQ-129-X. Hope someone is capable of posting pics for me, to better describe this mystery Hammarlund.

Thanks es 73....
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W7GIF
Member

Posts: 126




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« Reply #1 on: April 23, 2013, 03:01:17 PM »

Hope  I'm successful with these pics of the mystery receiver:

http://i37.tinypic.com/250r24n.jpg
http://i35.tinypic.com/2qn37o0.jpg
http://i35.tinypic.com/oibw38.jpg
http://i37.tinypic.com/2mmbj3r.jpg
http://i34.tinypic.com/dbqlww.jpg

Additional info: the bandspead dial (disc) has the 15 meter legend on it, and Hammarlund added the 15m to bandspread after the HQ-129's initial release/production. Maybe the former owner had disassembled this rx to install the "updated" (although damaged) bandspread dial.

And with a little more detective work, I discovered that the latest patent date listed on the ID plate (2211718) was issued on August 13, 1940.




« Last Edit: April 23, 2013, 04:00:22 PM by W7GIF » Logged
N3DT
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Posts: 666




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« Reply #2 on: April 23, 2013, 07:54:20 PM »

Sure looks like a Hammerlund, I hope you figure out what it is, I'd like to know too.
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W7GIF
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Posts: 126




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« Reply #3 on: April 23, 2013, 08:23:54 PM »

Sure looks like a Hammerlund, I hope you figure out what it is, I'd like to know too.
Hi Dave,
Yeah, the tube line-up is not like any other Hammarlund I've been able to find. BTW, the 4-6SJ7's that I called out in the first post, are actually 4-6SK7's.....duh....guess I'll chalk that "oops" up to clumsy fat fingers on the keyboard. And, I've never run across the threaded-header electrolytics located behind the tuning capacitor enclosure (shown on the chassis layout plate) in a 120 or 129.

The overlaid portion of the front panel is definitely cut from an HQ-120 panel (very clean cut, with no evidence of "hacking", or filing....just a smooth, clean cut).

If I can find a bandspead dial disc and the flywheel/pinch roller tuning piece, I'll try to bring this radio back to life. The rest of the radio, including the cabinet, is in really nice condition. I guess there's no good reason that I can't get that underway, and just hope that I can eventually find the dial and dial tuning parts later.
« Last Edit: April 23, 2013, 08:38:03 PM by W7GIF » Logged
KB4QAA
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Posts: 2486




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« Reply #4 on: April 24, 2013, 05:45:33 AM »

http://www.ohio.edu/people/postr/bapix/rbg2.htm
RBG-2

http://www.radiomuseum.org/r/hammarl_mf_rbg_1_chc_46163.html

http://bama.edebris.com/manuals/hammarlu/rbg/

It's a Navy RBG, a variant of the HQ-120. It was designed for shipboard use during WWII.  Obviously it has been hacked up.

Distinguishing characteristics:
-Potted round capacitors
-Tall rectangular IF transformers
-Main dial bandspread markers are in marine bands
-Bandspread dial calibrated for marine bands
-Tube lineup unlike either the -120 or -129.
-Case is steel with copper cladding
-Shock mounts instead of feet (if not replaced)

If you are still in doubt after reviewing photos and manual, I can provide photos.

bill

p.s.  the Bandspread can still be used on Ham bands by making a little conversion chart.

www.radiodaze.com  now has the ability to make custom dials
« Last Edit: April 24, 2013, 05:51:03 AM by KB4QAA » Logged
W7GIF
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Posts: 126




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« Reply #5 on: April 24, 2013, 08:44:13 AM »

http://www.ohio.edu/people/postr/bapix/rbg2.htm
RBG-2

http://www.radiomuseum.org/r/hammarl_mf_rbg_1_chc_46163.html

http://bama.edebris.com/manuals/hammarlu/rbg/

It's a Navy RBG, a variant of the HQ-120. It was designed for shipboard use during WWII.  Obviously it has been hacked up.

Distinguishing characteristics:
-Potted round capacitors
-Tall rectangular IF transformers
-Main dial bandspread markers are in marine bands
-Bandspread dial calibrated for marine bands
-Tube lineup unlike either the -120 or -129.
-Case is steel with copper cladding
-Shock mounts instead of feet (if not replaced)

If you are still in doubt after reviewing photos and manual, I can provide photos.

bill

p.s.  the Bandspread can still be used on Ham bands by making a little conversion chart.

www.radiodaze.com  now has the ability to make custom dials
Thanks Bill!
The tube lineup along with your description of the capacitors convinces me. I was able to access the radiomuseum and ohio.edu sites, but couldn't download the manual from the bama.edebris site (djvu file type). The info on the ohio.edu site was especially useful. But, now that I have a model designation, I'll search the web for a pdf version of the manual. The description of the bandspread dial for marine bands probably explains why it was removed and an attempt was made to replace it with a damaged ham band dial disc. It's curious that the internal ID plate didn't have entries for the model type and serial number, but maybe the front panel plates had that info, and there was no need to have it on the ID plate inside the receiver.
Last night I found the bandspread dial drive assembly that I had misplaced (filed in the "knobs" drawer), so, all I need now is a bandspread dial disc. And, thanks for the radiodaze info to satisfy that need.

THANKS AGAIN!!
« Last Edit: April 24, 2013, 09:33:43 AM by W7GIF » Logged
W7GIF
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Posts: 126




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« Reply #6 on: April 24, 2013, 03:17:50 PM »

Many thanks and lots of appreciation for this forum and those willing to help fellow boat anchor addicts.

Best 73,
Allen----W7GIF
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AC5UP
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Posts: 3955




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« Reply #7 on: April 24, 2013, 04:16:51 PM »

...but couldn't download the manual from the bama.edebris site (djvu file type)

Real Men [tm] know they can download the DejaVu reader here:  http://www.djvu.org/
Ain't no thing, I have it on both the Linux and Windoze side of this machine and I like it better than PDF....... Tighter file compression with cleaner rendering of greyscale illustrations.
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Never change a password on a Friday                
KB4QAA
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Posts: 2486




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« Reply #8 on: April 25, 2013, 12:06:17 PM »

http://hammarlund.org/MANUALS.html
Another site with Hammarlund manuals

http://www.hammarlund.info/hamrmanu.html
another

Don't be afraid of the Dejavu reader.  It is reliable and trustworthy.
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KB4QAA
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Posts: 2486




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« Reply #9 on: April 25, 2013, 01:08:07 PM »

http://amfone.net/Amforum/index.php?topic=26335.0

This topic at AMFone, has a copy of the metal ID tags. 

You can print out, laminate and stick on your radio, or you could have a plastics/metal/tropy shop make up photoresist copies.

If your bandspread dial is not readable, I will consider (deep breath) taking the face off mine and making a copy that you could print on clear overlay and then glue to a replacement disk.  Wink  bill
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W7GIF
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Posts: 126




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« Reply #10 on: April 25, 2013, 02:02:04 PM »

Thanks Bill.
After a couple of repeat failed attempts at downloading DejaVu yesterday, I downloaded the manual from mods.dk. I'll put the task of trying to figure out why I was unsuccessful downloading DejaVu on my list of things to get around to.

Although your offer is very generous, don't even think about removing your dial disc. The disc that I have has all very readable complete scales, but it sure looks like someone got the area (arc) between the scaled areas really hot (melted) enough that it's pretty "gnarly", and can't be driven by the pinch roller of the dial drive mechanism. This is the area on the dial with the dial part number: 6051-2. I've contacted radiodaze wrt getting a repro dial, but no response from them yet. In the meantime, I can get on with the task of doing whatever electrical work is needed, and lack of the dial won't slow me down.

Thanks again.
« Last Edit: April 25, 2013, 02:04:11 PM by W7GIF » Logged
KB4QAA
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Posts: 2486




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« Reply #11 on: April 25, 2013, 02:05:39 PM »

Ok, I'll be glad to work with you.

I've had some luck with leveling plastics from a National NC-173 by placing them on a flat surface and heating gently with a hot air gun.

p.s. I checked my RGB-2, and their is no model number or serial on the patent number placard.
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W7GIF
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Posts: 126




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« Reply #12 on: April 25, 2013, 02:36:19 PM »

Ok, I'll be glad to work with you.

I've had some luck with leveling plastics from a National NC-173 by placing them on a flat surface and heating gently with a hot air gun.

p.s. I checked my RGB-2, and their is no model number or serial on the patent number placard.
It looks like someone tried to reconstruct, repair by filling with (maybe) epoxy, the chewed up edge of the dial disc. Why that area got melted is curious, unless they were trying to cure the epoxy (or whatever was used as fill). I'm hoping radiodaze responds, since I'm certain they could use my dial disc to reproduce one, and add to their list of available dials. I also have to fabricate new dial windows with the hairline index/cursor, as both of mine are in pieces. But, I should be able to do that.

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KD0ACY
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Posts: 91




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« Reply #13 on: April 25, 2013, 10:35:04 PM »

If anyone is interested, I have several bandspred and freq dials that are from A HQ 129 or 129 that are very readable with laminations seperated and warped. I would be happy to send them without charge if someone would pay postage.
Mike
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W7GIF
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« Reply #14 on: April 26, 2013, 07:21:26 AM »

If anyone is interested, I have several bandspred and freq dials that are from A HQ 129 or 129 that are very readable with laminations seperated and warped. I would be happy to send them without charge if someone would pay postage.
Mike
Mike, I sent you a PM with my email address. I'd sure be interested in the dials. Radio Graphics may be able to use them for making reproduction dials. Check your PM's for my message.

Thanks,
Allen
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