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 Crammond radiogram information
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 Return to top of page · Post #: 1 · Written at 12:58:09 PM on 14 July 2023.
GBR's Gravatar
 GBR
 Location: Gladstone, QLD
 Member since 15 May 2016
 Member #: 1925
 Postcount: 34

Hi all,

Wondering if anyone can direct me to information, schematics etc, for the pictured Crammond portable radiogram.

I understand that Crammond were a Brisbane based company, but that's pretty much all I have found.

It looks like some of the turntable components are of German origin.

The chassis has what looks like A I 324 stamped on it.

Any help would be much appreciated

Gary

Crammond tablegram
Crammond tablegram
Crammond tablegram
Crammond tablegram
Crammond tablegram


 
 Return to top of page · Post #: 2 · Written at 2:29:01 PM on 14 July 2023.
GTC's avatar
 GTC
 Location: Sydney, NSW
 Member since 28 January 2011
 Member #: 823
 Postcount: 6720

Radiomuseum lists 56 Crammond models, 13 with images.

The valve line-up, if known, often aids in identification.


QUOTE: Crammond Radio Manufacturing Co. was established in 1928 as a subsidiary of Melton and Co., they were one of the earliest radio businesses in Queensland and had premises in Queen Street. They designed and manufactured a range of domestic radio receivers and in the 1960’s radio transceivers.

Founded: 1912

Production History: 1928 --

Melton & Co. was registered in June 1912 as Photographers, Photograph Supplies and Importers.

In July 1928 the company advertised that they have a subsidiary company called Crammond, Carter Radio Manufacturing and in February 1930 that Mr. Alfred Crammond was their radio designer and had been with the company for years.

They advertised AWA radios in August 1928 which the obtained from the Queensland AWA wholesaler JB Chandler & Co. and Brisbane distributors for Atwater Kent in May 1929.

In October 1930 with the tariff protection applied to imported radios, the company started manufacturing Crammond Receivers on a larger scale.

An advert for selling Philips radios in 1930 displayed Melton & Co., Photographic & Radio Supplies, A Crammond & TH Skinner as proprietors.

Crammond Radio Co., later, Crammond Radio Manufacturing Co. Ltd. manufactured a wide variety of radios, a PH Meter in 1947 and radio transceivers into the late 1960’s.

Advertisements after WW2 display an eagle for their Logo.
-- Radiomuseoum


 
 Return to top of page · Post #: 3 · Written at 4:39:49 PM on 14 July 2023.
GBR's Gravatar
 GBR
 Location: Gladstone, QLD
 Member since 15 May 2016
 Member #: 1925
 Postcount: 34

Thank you GTC

Sorry, I should have mentioned, that was where I got my info regarding Brisbane from. I could not, however, find anything relating to the unit that I have.

Hopefully when the photos go up it will jog somebody's memory. Valve line-up can't help me this time as it is an early transistor radio.


 
 Return to top of page · Post #: 4 · Written at 5:42:48 PM on 14 July 2023.
GTC's avatar
 GTC
 Location: Sydney, NSW
 Member since 28 January 2011
 Member #: 823
 Postcount: 6720

Valve line-up can't help me this time as it is an early transistor radio.

Radiomuseum can also be searched on semiconductor lineups.


 
 Return to top of page · Post #: 5 · Written at 10:01:18 AM on 16 July 2023.
Brad's avatar
 Administrator
 Location: Naremburn, NSW
 Member since 15 November 2005
 Member #: 1
 Postcount: 7342

Photos uploaded.


‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾
A valve a day keeps the transistor away...

 
 Return to top of page · Post #: 6 · Written at 5:32:04 PM on 16 July 2023.
Ian Robertson's Gravatar
 Location: Belrose, NSW
 Member since 31 December 2015
 Member #: 1844
 Postcount: 2405

The turntable is a battery operated model by BSR UK. The motor could be German or Swiss. It has a centrifugal governor to maintain the speed (hopefully!)


 
 Return to top of page · Post #: 7 · Written at 9:33:31 PM on 16 July 2023.
Robbbert's avatar
 Location: Hill Top, NSW
 Member since 18 September 2015
 Member #: 1801
 Postcount: 2039

I was wondering why there were no valves in the photos, there's rubber grommets supporting each transistor, back when they were thought to be delicate. I've seen this kind of thing in my teenage days of dump scavenging.

I suppose you could pop out each transistor from its rubber shroud and read off the number, assuming the rubber hasn't gone gooey.


 
 Return to top of page · Post #: 8 · Written at 12:24:50 AM on 17 July 2023.
GTC's avatar
 GTC
 Location: Sydney, NSW
 Member since 28 January 2011
 Member #: 823
 Postcount: 6720

I was wondering why there were no valves in the photos, there's rubber grommets supporting each transistor

Looks like a valve chassis transistorised.


 
 Return to top of page · Post #: 9 · Written at 9:57:20 AM on 17 July 2023.
Marcc's avatar
 Location: Wangaratta, VIC
 Member since 21 February 2009
 Member #: 438
 Postcount: 5303

HMV did make a tube & transistor set in the same cabinet, so seeing changing dies in presses was expensive, there was a lot of economic sense in using the same chassis in several models. Which as time progressed did happen.

I have seen several radios with a chassis xx and the later HMV Nippers in the fifties were very much a standard pattern.

Marc


 
 Return to top of page · Post #: 10 · Written at 4:26:01 PM on 20 July 2023.
GBR's Gravatar
 GBR
 Location: Gladstone, QLD
 Member since 15 May 2016
 Member #: 1925
 Postcount: 34

Very sorry guys, been without access for a bit.

I will endeavour to remove the transistors from the mounts and get specs

Regards

Gary


 
 Return to top of page · Post #: 11 · Written at 12:16:04 PM on 3 March 2024.
GARYS CRAMMONDS's Gravatar
 Location: BRISBANE, QLD
 Member since 3 March 2024
 Member #: 2617
 Postcount: 3

Hello GBR,
I have been researching Crammond Radio Manufacturing (CRM) for many years, in particular, the HF radio communications equipment. At CRM, a serial number was usually stamped on a rear part, apron or top, of the radio chassis. Sometimes, the model number was also stamped nearby. Serial numbers were sequential regardless of the type of device, broadcast radio or radio transceiver, and were preceded by a prefix. Prefix "A" indicates broadcast radio while "T" was applied to radio communications transceivers. Serial number "A1324" dates the radiogram at about 1962/63. This is interesting, because the Crammond radio communications transceivers were all valve based at that time (except for some transistor DC power supplies). I would appreciate knowing what date-codes & model numbers appear on the mains & speaker transformers if possible?
Thanks
Gary.


 
 Return to top of page · Post #: 12 · Written at 1:10:24 PM on 3 March 2024.
Ian Robertson's Gravatar
 Location: Belrose, NSW
 Member since 31 December 2015
 Member #: 1844
 Postcount: 2405

Don't bother pulling those transistors out. I can tell you what they will be.

Mix/Osc OC44
1st and 2nd IFs are TI parts, from STC, Probably 2N308 and/or 2N309.
But my guess is they would have been OC45s in the design and substituted for supply reasons.
1st and 2nd audio will be OC70 or OC71, doesn't matter which.
The two output transistors mounted in flag type heatsinks under the chassis will be OC72s. Or if they are those square metal ones, they will be 2N185s.

By the way, if you end up having to replace any of those transistors, did you know that you can use a BC557 in any position in that radio? Including the output transistors, in a pair.

Circuit will be close to a combination of an STC 6100 and TG4080, available here:

https://www.kevinchant.com/stc1.html

I can't find any clue to this unit's existence on Radiomuseum.


 
 Return to top of page · Post #: 13 · Written at 11:40:46 AM on 21 March 2024.
GBR's Gravatar
 GBR
 Location: Gladstone, QLD
 Member since 15 May 2016
 Member #: 1925
 Postcount: 34

Thank you very much Ian and Gary. I will dig the old girl out and get it running soon hopefully.

Gary, I will get those numbers for you


 
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