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Vintage Amateur and Military Radio Amateur/military receivers and transmitters, morse, and any other related vintage comms equipment.

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Old 20th Aug 2017, 4:07 pm   #1
saddlestone-man
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Default Identify this Radio?

Hello All

I picked up this interesting (to me anyway) radio at the Rugby rally today. It looks like something from the US that's found its way over here. There's a three gang tuning capacitor so it has an RF amplifier. It looks military, but not rugged enough to used anywhere near combat.

The valves are: 7A7, 7Q7, 7A7, 7B6, 7C5.

It's rigged to work off external power, but it looks like it could have originally been fitted with a mains transformer and rectifier.

It has SC 6732A printed on the rear panel. Can anyone put a date and make/model number to it.

best regards ... Stef
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Old 20th Aug 2017, 4:30 pm   #2
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Default Re: Identify this Radio?

I can't help you with this particular set but it looks like what is often referred to as a NAAFI Set.

Cheers

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Old 20th Aug 2017, 4:32 pm   #3
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Default Re: Identify this Radio?

Looks intriguing: the use of "Loktal" valves [rather than mid-WWII-era B7G types] would put it early in WWII timescales.

Definitely not a 'portable' - by the early-1940s Hallicrafters etc. had the likes of the "SKy Traveler" S29 on the market to address the niche: http://www.radiomuseum.org/r/hallicr..._s_29_s29.html

Lack of a BFO, however, marks it out as an 'entertainment' radio rather than a communications-set.

What are its power-supply needs? The big transformer-shaped hole in the chassis and empty valve-socket make me think it was originally intended to run on AC supplies.
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Old 20th Aug 2017, 6:47 pm   #4
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Default Re: Identify this Radio?

It's a near-certainty that "SC" is a Signal Corps (i.e. US) designation- a query on one of the American vintage websites might be fruitful, I wouldn't be surprised of lots of these were made for field "morale" purposes and then dumped NOS on the market post-war.

In a sympathy-for-the-underdog sort of way, I quite like the loktal valve series- like the rimlock series, the presentation may have been misconceived, but the valves per se do a perfecrly good job for the most part. The main short-coming is short pins, leading to contact dependability problems. Quite a bit of the more "peripheral" US military kit seemed to use them- could it be that the earlier but tough and proven metal octal types were favoured for front-line kit and loktals, appearing in quantity for civilian use just pre-war, were used for less critical kit to ease possible production bottle-necks?

Maybe the original mains transformer was a 110V-only type, or just a commercial quality item that expired at some point.? I'd say this set ought to be a good performer, but the elephant in the room is the declining AM transmitter scene! Shame about the lack of LW, but hardly surprising in a US-originated set.

The B9a valve-socket on the LHS suggests something like a 7Y4-to-EZ80 adaptation?

Last edited by turretslug; 20th Aug 2017 at 6:55 pm. Reason: Supplement.
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Old 20th Aug 2017, 7:32 pm   #5
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Default Re: Identify this Radio?

I did a search on US WW2 morale radios and a lot of images came up. This link shows something like yours:


http://www.ohio.edu/people/postr/bapix/6000-bac.htm

Google images was my search engine.

73

Roger
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Old 20th Aug 2017, 7:32 pm   #6
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Default Re: Identify this Radio?

Another clue as to its American origin is the use of BC for Broadcast instead of medium wave.
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Old 20th Aug 2017, 7:41 pm   #7
saddlestone-man
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Default Re: Identify this Radio?

Thanks Roger, that looks very like my radio, but a different version. Well spotted!

My radio is powered by flying leads for the HT and LT, obviously after the original power supply was stripped out.

best regards ... Stef
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Old 20th Aug 2017, 8:03 pm   #8
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Default Re: Identify this Radio?

https://www.worthpoint.com/worthoped...iver-246029409

Lawrence.
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Old 20th Aug 2017, 8:10 pm   #9
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Default Re: Identify this Radio?

Ummm, no doubt these radios were occasionally carried or used in jeeps, but to describe it as a "Jeep Radio" is pushing it a little! Having said that, I do have a photo of a BC-610 transmitter in a jeep but I'd hardly describe the '610 as a jeep radio!

Roger

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Old 20th Aug 2017, 8:19 pm   #10
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Default Re: Identify this Radio?

Looks like it may have originally been fitted with a vibrator and associated transformer.
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Old 20th Aug 2017, 8:32 pm   #11
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Default Re: Identify this Radio?

I've just been looking at some pictures of radio installations in Jeeps and as expected, they are all of rugged transmitter/receiver/control unit combinations. Judging by the sort of bumps and shaking about that jeeps typically endured, I don't think my radio would have lasted very long.
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Old 20th Aug 2017, 8:44 pm   #12
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Default Re: Identify this Radio?

It's hardly an "installation" type radio, neither is it a comms set, quite likely they were carried around in some Jeeps just as much as in any other vehicle for general entertainment.

Lawrence.
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Old 26th Aug 2017, 9:45 pm   #13
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Default Re: Identify this Radio?

The transformer and other power supply components were perhaps stripped out as it may have been for 117v 60Hz - not that the frequency matters much.
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Old 26th Aug 2017, 10:50 pm   #14
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Default Re: Identify this Radio?

Quote:
Originally Posted by majoconz View Post
......... it may have been for 117v 60Hz - not that the frequency matters much.
It can, if the 60Hz transformer design is cheesepared to the limit it will overheat on 117V 50Hz supplies.
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Old 15th Sep 2017, 7:35 am   #15
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Default Re: Identify this Radio?

Does the 3-section tuning gang indicate that the radio had a "tuned RF stage"?
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Old 15th Sep 2017, 2:16 pm   #16
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Default Re: Identify this Radio?

The circuit diagram linked to in post 8, although it's only a thumbnail, shows an RF stage.
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Old 15th Sep 2017, 3:53 pm   #17
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Default Re: Identify this Radio?

Whilst it's a straightforward-to-use broadcast receiver, it's intended role could have involved it being sat on the ground on a remote Pacific island with whatever handy bit of wire could be found as an aerial, and with a fair amount of military comms rattling around in the vicinity at various frequencies- so both the extra sensitivity and front-end selectivity resulting from an RF stage would have been considered worthwhile.
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Old 23rd Oct 2017, 10:43 am   #18
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Default Re: Identify this Radio?

Quote:
Originally Posted by G3VKM_Roger View Post
Ummm, no doubt these radios were occasionally carried or used in jeeps, but to describe it as a "Jeep Radio" is pushing it a little! Having said that, I do have a photo of a BC-610 transmitter in a jeep but I'd hardly describe the '610 as a jeep radio!
As I understand it, the term "Jeep" was originally a U.S. military slang abbreviation for General Purpose, and subsequently became mostly associated with the ubiquitous Pick-up truck usually referred to as a "Jeep", as it was a general purpose vehicle. So Jeep in the original context could well apply to your radio. Tony
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