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Sets, Parts and Service Information Wanted (private buyers only, no swaps) If you need help obtaining components, sets or equipment, post a message here. Private buyers only - no traders. No swaps.

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Old 16th Mar 2019, 11:23 pm   #1
60 oldjohn
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Default HMV car radio model number ? 1950s

What HMV radio were fitted in the rover P4 from the 1950s ? It has speaker to the left of the radio, the power supply is in a separate box. Radio looks to have 5 pre-set buttons. I will not get the set for a few months, but would like to look it up and get the service sheet when I get the number. There are pictures on the net, please scroll down to JPG 717x538

Link removed by moderator as it contains maladvertising


TIA John.
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Old 17th Mar 2019, 2:40 am   #2
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Default Re: HMV car radio model number ? 1950s

https://www.radiomuseum.org/r/hismas...bile_4220.html

Or this: https://www.radiomuseum.org/r/radiom...t_smitson.html


Looks like it.
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Old 17th Mar 2019, 11:06 am   #3
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Default Re: HMV car radio model number ? 1950s

Thank you Chris, That's the one, strange it has the HMV logo on the front of radio but is a Radiomobile 4220. I wonder what the arrangement was, just rebadging or were they part of HMV?


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Old 17th Mar 2019, 11:16 am   #4
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Default Re: HMV car radio model number ? 1950s

Any one know where I can get the service information ?




TIA John

Last edited by 60 oldjohn; 17th Mar 2019 at 11:36 am.
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Old 17th Mar 2019, 11:24 am   #5
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Default Re: HMV car radio model number ? 1950s

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Originally Posted by 60 oldjohn View Post
Thank you Chris, That's the one, strange it has the HMV logo on the front of radio but is a Radiomobile 4220. I wonder what the arrangement was, just rebadging or were they part of HMV?
Originally set up as S Smith & Sons (Radiomobile) Ltd, by The Gramophone Company Ltd (an EMI subsidiary) and Smiths Motor Accessories Ltd, to market car radios made by The Gramophone Co. Each company held a 50% interest.
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Old 17th Mar 2019, 12:02 pm   #6
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Default Re: HMV car radio model number ? 1950s

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Any one know where I can get the service information ?
There's some on Radiomuseum.

Look at 4222 for head unit and E IF & AF amp for the amplifier/psu box.

Rover P4 club might also be helpful?
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Old 17th Mar 2019, 12:06 pm   #7
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Default Re: HMV car radio model number ? 1950s

I think you will find that the separate power unit is not just a PSU but the audio amplifier and IF strip as well - there should be a tuned lead to connect it to the tuner head.

This was definitely the case with the Radiomobile set I looked at in an R type Bentley many years ago.

Fault then was a pair of worn out N78s in the amp.

These sets were built in the EMI factory at Hayes.
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Old 17th Mar 2019, 12:11 pm   #8
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Default Re: HMV car radio model number ? 1950s

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Originally Posted by 60 oldjohn View Post
Any one know where I can get the service information ?
There's some on Radiomuseum.
Thanks, unfortunately I am not a member, I did try some years ago but something happened to my code and I did not try joining again.

John.
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Old 17th Mar 2019, 12:21 pm   #9
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Default Re: HMV car radio model number ? 1950s

Service info for the Radiomobile/HMV 4200 & 4201, which should be similar, is available from VRSD for 1.99, but, AFAIK, non-members of RadioMuseum are allowed a limited number of downloads.
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Old 17th Mar 2019, 12:40 pm   #10
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Default Re: HMV car radio model number ? 1950s

I don't know whether or not it will help much but the 1959/60 volume of Radio & Television Servicing has a section devoted to Radiomobile and there is a model described as a 42T. All on Paul's CDs I think.

Alan
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Old 17th Mar 2019, 2:06 pm   #11
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Default Re: HMV car radio model number ? 1950s

These original Radiomobile sets are remarkably good performers, having an RF stage in addition to a relatively conventional superhet circuit. Both single ended and push-pull output units were available.

As Barry states, the head unit, which is permeability tuned, sends its output at IF to the power unit which includes the IF and AF amplifiers. The interconnection between head and power units is rather complex and includes audio as well as IF and power. This is because volume and tone controls are included in the head unit.

The screened multicore interconnect cable (illustrated) is stiff and can develop breaks once removed from the vehicle, resulting in obscure faults. I've replaced one with a loom of separate screened cables which is much more flexible.

Martin
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Old 17th Mar 2019, 2:16 pm   #12
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Default Re: HMV car radio model number ? 1950s

I wouldn't go anywhere near the webpage in the original post. Clicking on the HMV radio image on that page got me one of those "Your computer is infected with 3 viruses - quick, panic and click on our link to clean it"

It was just the try-on version but it managed to insert itself into the reopen with this file list, so I had to dump my web history to get rid of it.

It may be helpful to others if the mods removed that hyperlink.

David
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Old 17th Mar 2019, 2:47 pm   #13
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Default Re: HMV car radio model number ? 1950s

Thank you David, I did try it, my anti virus warned me there might be trouble on all their sites so did not go any further. I do not need the circuit for a few months so I will wait a while. The set was restored to working around 30 years since, but looses volume intermittently. Tapping control unit restores normal working.

OOPs just re read your post, sorry but I never had problems with that page.

John.
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Old 17th Mar 2019, 5:05 pm   #14
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Default Re: HMV car radio model number ? 1950s

It's probably been boobytrapped since you last used it.

David
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Old 17th Mar 2019, 6:06 pm   #15
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Default Re: HMV car radio model number ? 1950s

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Originally Posted by Radio Wrangler View Post
I wouldn't go anywhere near the webpage in the original post. Clicking on the HMV radio image on that page got me one of those "Your computer is infected with 3 viruses - quick, panic and click on our link to clean it"
I received a message identifying that I was using an iPad and clicking on the photo would open a pornographic site - not a very good one!

I bought one of these radios before I was aware that it came in two parts. Once I had it I noticed that all was not well and looking through a hole in the side noticed a transistor! Took the lid off and discovered that the original valve works had been removed and a cheap transistor portable circuit board put in their place rather badly, a real bodge job. An attempt had been made to couple the tuning control to the new board, unsuccessfully. I was not allowed to return it since I had opened it even though it was not really as described. Alll ended well as the next weekend a found a complete original two unit radio for less money at a rally.

Good luck with yours John!

Peter
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Old 17th Mar 2019, 8:50 pm   #16
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Default Re: HMV car radio model number ? 1950s

Quote:
Originally Posted by Radio Wrangler View Post
I wouldn't go anywhere near the webpage in the original post. Clicking on the HMV radio image on that page got me one of those "Your computer is infected with 3 viruses - quick, panic and click on our link to clean it"

It was just the try-on version but it managed to insert itself into the reopen with this file list, so I had to dump my web history to get rid of it.

It may be helpful to others if the mods removed that hyperlink.

David
I checked the link and my anti-virus software blocked. I've now deleted it.
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Old 17th Mar 2019, 9:01 pm   #17
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Default Re: HMV car radio model number ? 1950s

Here's the picture from the OP's link:-

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Old 17th Mar 2019, 10:53 pm   #18
60 oldjohn
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Default Re: HMV car radio model number ? 1950s

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Quote:
Originally Posted by Radio Wrangler View Post
I wouldn't go anywhere near the webpage in the original post. Clicking on the HMV radio image on that page got me one of those "Your computer is infected with 3 viruses - quick, panic and click on our link to clean it"

It was just the try-on version but it managed to insert itself into the reopen with this file list, so I had to dump my web history to get rid of it.

It may be helpful to others if the mods removed that hyperlink.

David
I checked the link and my anti-virus software blocked. I've now deleted it.

Thank you Graham, I just realised I did not click on the actual link, just copied the address bar at the top of that page. My apologies to anyone who has had a negative experience with the site. Thank you Trigon for the photo.


John.
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