Welcome to Australia's only Vintage Radio and Television discussion forums. You are not logged in. Please log in below, apply for an account or retrieve your password.
Australian Vintage Radio Forums
  Home  ·  About Us  ·  Discussion Forums  ·  Glossary  ·  Outside Links  ·  Policies  ·  Services Directory  ·  Safety Warnings  ·  Tutorials

General Discussion

Forum home - Go back to General discussion

 32v version of HMV C23A
« Back · 1 · 2 · Next »
 Return to top of page · Post #: 1 · Written at 4:06:34 PM on 1 March 2015.
32 Volt Radio's Gravatar
 Location: Sydney, NSW
 Member since 10 March 2011
 Member #: 852
 Postcount: 69

This is an early 50's large Bakelite radio with the big flat/horizontal cream coloured plastic dial.
Does it have its own model designation? Anyone have a copy of the cct?
Parts of the 32v chassis of interest also.
Cheers Michael. TIA.


 
 Return to top of page · Post #: 2 · Written at 4:19:07 PM on 1 March 2015.
GTC's avatar
 GTC
 Location: Sydney, NSW
 Member since 28 January 2011
 Member #: 823
 Postcount: 6172

The only schematic I have for C23A is mains power.

I have a schematic for C25A which is battery and has line-up: 1C7, 1M5, 1K7, 1K7, 1L5.

If that's it let me know and I'll send you the schematic and notes.


 
 Return to top of page · Post #: 3 · Written at 2:28:00 AM on 2 March 2015.
MonochromeTV's avatar
 Location: Melbourne, VIC
 Member since 20 September 2011
 Member #: 1009
 Postcount: 1136

I believe it could be a HMV model C27A. There is a console version, C47A that uses the same chassis. These are both 32 volt DC home lighting plant powered models.

The cabinet for the C27A is the same as the AC C23A & battery/vibrator C25A. The chassis is similar to the layout and design to the 807 powered R43A, R43B, R53A & R53B radiograms that was discussed here recently.

If it is indeed a C27A, the valve line-up should be 6AN7, 6N8, 6N8, 6N8 & 6V6 + a synchronous vibrator.


 
 Return to top of page · Post #: 4 · Written at 5:08:46 PM on 2 March 2015.
32 Volt Radio's Gravatar
 Location: Sydney, NSW
 Member since 10 March 2011
 Member #: 852
 Postcount: 69

Thankyou for the replies GTC and MonochromeTV.
It seems that it is for sure the HMV C27A. Anyone with further info/parts?
Thanks for the tips about the battery model and the similar chassis layout of the console model.
Regards Michael.


 
 Return to top of page · Post #: 5 · Written at 6:27:42 PM on 2 March 2015.
GTC's avatar
 GTC
 Location: Sydney, NSW
 Member since 28 January 2011
 Member #: 823
 Postcount: 6172

I can't locate technical any info on those models, just this ad from July 1952:

HMV C27A Radiogram



 
 Return to top of page · Post #: 6 · Written at 6:55:41 PM on 2 March 2015.
MonochromeTV's avatar
 Location: Melbourne, VIC
 Member since 20 September 2011
 Member #: 1009
 Postcount: 1136

Service information for C27A & C47A sent.

HMV C27A And C47A Chassis


HMV C27A And C47A Service Manual.


 
 Return to top of page · Post #: 7 · Written at 8:21:33 PM on 2 March 2015.
32 Volt Radio's Gravatar
 Location: Sydney, NSW
 Member since 10 March 2011
 Member #: 852
 Postcount: 69

PDF service information received just then....thankyou very much ! Much more than I had hoped for.
Sending you an email re more farm radio information. Regards from Michael.


 
 Return to top of page · Post #: 8 · Written at 9:50:38 PM on 2 March 2015.
GTC's avatar
 GTC
 Location: Sydney, NSW
 Member since 28 January 2011
 Member #: 823
 Postcount: 6172

.Monchrome: out of interest, where did you find that data?


 
 Return to top of page · Post #: 9 · Written at 11:06:06 PM on 2 March 2015.
MonochromeTV's avatar
 Location: Melbourne, VIC
 Member since 20 September 2011
 Member #: 1009
 Postcount: 1136

Hi GTC,

I can't quite remember where I got the HMV C27A from, but I think it might of been part of the spoils of a deceased radio & TV servicemans estate.

The HMV and the recently found Philips 3852 service manual, along with many others, are not found in the AORSM manuals.

Thanks to your newspaper clipping we can now establish that there are at least 4 versions of that HMV stlye of bakelite table cabinet, which includes the C21A, C23A, C25A & C27A. (note the sequential odd numbers)

I haven't studied the circuit of the C27A yet, but having the 6AN7 & the 3 6N8's I think it might be fairly similar to the R43A, R43B, R53A & R53 807 radiogram circuit.


 
 Return to top of page · Post #: 10 · Written at 11:22:13 PM on 2 March 2015.
GTC's avatar
 GTC
 Location: Sydney, NSW
 Member since 28 January 2011
 Member #: 823
 Postcount: 6172

Thanks. Sometimes I encounter AORSM indexing errors.

I often wonder why some radio models were covered by AORSM and not others. The whole AORSM and JR Manuals publishing process is a mystery to me, and I doubt there are any players left alive today to explain it.


 
 Return to top of page · Post #: 11 · Written at 9:25:29 PM on 3 March 2015.
Brad's avatar
 Administrator
 Location: Greenwich, NSW
 Member since 15 November 2005
 Member #: 1
 Postcount: 6574

The whole AORSM and JR Manuals publishing process is a mystery to me, and I doubt there are any players left alive today to explain it.

I agree. It would never happen in somewhere like the motor industry - where the companies go out of their way to make their service manuals almost impossible to get. The usual "we're out of stock mate" or "that'll be $532.56 - cash or charge?" routine stops most people seeking manuals from reaching the acquisition stage. Too hard or simply too expensive.

It could be the case that the AORSM books succeeded because the manufacturers didn't want to be in the sideline business of publishing. Then again, some of the larger companies did publish certain books. AWA and Philips, as most of us know, published valve data books. AWA, via various subsidiaries, published text books on radio theory and practice.

Unless someone here either worked for the publisher of the AORSMs or knows someone who did then we may never know the real reason these books came into being. We do have someone to thank for it though - they are an invaluable resource.


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

 
 Return to top of page · Post #: 12 · Written at 8:45:42 PM on 12 July 2015.
Clive Durham's Gravatar
 Location: Grenfell, NSW
 Member since 8 July 2015
 Member #: 1771
 Postcount: 212

Hi Gents, I am new to this site and interested in HMV as I have a mains mantle radio the same as the ones in the advert on this thread but Model S23A circa 1950.
I am looking for a circuit diagram and any other info to restore this set.

Clive


‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾
Clive

 
 Return to top of page · Post #: 13 · Written at 10:51:58 AM on 13 July 2015.
GTC's avatar
 GTC
 Location: Sydney, NSW
 Member since 28 January 2011
 Member #: 823
 Postcount: 6172

.Clive,

If you use Control Panel to unhide your email address, I'll send you the schematic and notes.


 
 Return to top of page · Post #: 14 · Written at 5:52:44 PM on 15 July 2015.
Clive Durham's Gravatar
 Location: Grenfell, NSW
 Member since 8 July 2015
 Member #: 1771
 Postcount: 212

Hi GTC, that would be fantastic................I have unhidden my email for you.

I have a KB BR40T to collect in a couple of months so I shall have a bit to do.

Many thanks.


‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾
Clive

 
 Return to top of page · Post #: 15 · Written at 8:52:26 PM on 15 July 2015.
GTC's avatar
 GTC
 Location: Sydney, NSW
 Member since 28 January 2011
 Member #: 823
 Postcount: 6172

Okay, sent.

Some of these scans are not the best quality, so you may have to zoom the PDF for clarity.


 
« Back · 1 · 2 · Next »
 You need to be a member to post comments on this forum.

Sign In

Username:
Password:
 Keep me logged in.
Do not tick box on a computer with public access.