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 Post subject: WANTED: Replacement HMV 5A / 5B backs
PostPosted: Fri Jul 31, 2020 2:29 pm 
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Victor II
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Joined: Mon Jul 27, 2015 10:41 pm
Posts: 351
Location: Riverside, California
Does anyone still make/supply replacement backs for HMV 5A or 5B soundboxes? The fact that so many are swollen or showing signs of aging is worrisome. I knew there were aluminum replacements out there at some point, are they still available?

Thanks,
-John
"There are two kinds of people in this world: people who eat grapes in the grocery store and good people."


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 Post subject: Re: WANTED: Replacement HMV 5A / 5B backs
PostPosted: Fri Jul 31, 2020 2:36 pm 
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Victor VI
An analogue relic trapped in a digital world.
Joined: Mon Oct 24, 2011 1:21 pm
Posts: 3423
Location: The Somerset Levels, UK.
https://www.windupgram.co.uk/replacemen ... und-boxes/


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 Post subject: Re: WANTED: Replacement HMV 5A / 5B backs
PostPosted: Fri Jul 31, 2020 6:39 pm 
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Victor IV
Joined: Sun Mar 15, 2009 6:18 am
Posts: 1158
Location: Luxembourg
epigramophone wrote:
https://www.windupgram.co.uk/replacement-backs-for-hmv-5a-5b-no-4-sound-boxes/


The shortcoming with these replacement backs is the absence of the place to fit the rubber ring. When connected directly to the arm, the compliance provided by the rubber ring is lost, creating a high load on the record groove (and increased wear), as well as eliminating the acoustic damping provided by the rubber ring. I have experienced the beneficial effects of the rubber ring everytime I replaced a hardened one with a new ring. The acoustic effect is clearly noticeable, as well as the reduction in record wear.


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 Post subject: Re: WANTED: Replacement HMV 5A / 5B backs
PostPosted: Fri Jul 31, 2020 6:58 pm 
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Victor VI
Joined: Tue Jan 21, 2014 12:55 am
Posts: 3082
Location: Eugene/ Springfield Oregon USA
CarlosV wrote:
epigramophone wrote:
https://www.windupgram.co.uk/replacement-backs-for-hmv-5a-5b-no-4-sound-boxes/


The shortcoming with these replacement backs is the absence of the place to fit the rubber ring. When connected directly to the arm, the compliance provided by the rubber ring is lost, creating a high load on the record groove (and increased wear), as well as eliminating the acoustic damping provided by the rubber ring. I have experienced the beneficial effects of the rubber ring everytime I replaced a hardened one with a new ring. The acoustic effect is clearly noticeable, as well as the reduction in record wear.


This.

It's quite unfortunate that this replacement is made like this. Totally ruins the whole exercise.
"He who dies with the most shellac wins"- some nutty record geek


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 Post subject: Re: WANTED: Replacement HMV 5A / 5B backs
PostPosted: Fri Jul 31, 2020 7:17 pm 
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Victor II
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Joined: Mon Jul 27, 2015 10:41 pm
Posts: 351
Location: Riverside, California
Thanks for the info. Interesting.

Have no idea why it’s made all in one piece. Although, considering the back flange I have is completely rock hard, I’m still considering one, LOL.
"There are two kinds of people in this world: people who eat grapes in the grocery store and good people."


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 Post subject: Re: WANTED: Replacement HMV 5A / 5B backs
PostPosted: Sat Aug 01, 2020 6:10 am 
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Victor II
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So many audio formats, so little listening time!
Joined: Fri Oct 11, 2019 4:49 pm
Posts: 282
Location: Wiltshire, UK
I have one of these new backs and must admit that I didn't realize when I bought it that it didn't have the rubber isolator or a space for one. I have yet to fit it for the reasons highlighted above about sound and record wear. If you are going to the trouble of replicating the back it seems a huge oversight not to of incorporated it in the design in my opinion.
I am interested in all forms of audio media including: gramophones, phonographs, wire recorders, the tefifon, reel to reel tapes, radiograms and radios.


Last edited by phonosandradios on Sat Aug 01, 2020 3:59 pm, edited 1 time in total.

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 Post subject: Re: WANTED: Replacement HMV 5A / 5B backs
PostPosted: Sat Aug 01, 2020 10:16 am 
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Victor IV
Joined: Sun Mar 15, 2009 6:18 am
Posts: 1158
Location: Luxembourg
Jwb88 wrote:
Thanks for the info. Interesting.

Have no idea why it’s made all in one piece. Although, considering the back flange I have is completely rock hard, I’m still considering one, LOL.


If the problem wih your soundbox is only the hardened rubber back, there are good replacements for sale. Removing the old one is tricky and requires patience, but can be done.


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 Post subject: Re: WANTED: Replacement HMV 5A / 5B backs
PostPosted: Fri Oct 09, 2020 2:05 pm 
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Victor IV
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Keep'em well oiled
Joined: Mon Dec 18, 2017 2:51 am
Posts: 1000
Location: Madrid, Spain
See my post in
viewtopic.php?f=11&t=46940&p=278563#p278563
The backplate fail can be ammended with a lathe...
Inigo


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 Post subject: Re: WANTED: Replacement HMV 5A / 5B backs
PostPosted: Sun Oct 11, 2020 2:08 pm 
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Victor VI
Joined: Mon Aug 24, 2009 3:08 pm
Posts: 3155
Location: Harrison Township, MI
As Inigo suggests, anyone with access to a metal lathe can bore the hub to allow the rubber isolator to fit. I realize however, that might not be just anyone. Still, a solvable issue. Best to buy them while they're available and look into the other issue later.


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 Post subject: Re: WANTED: Replacement HMV 5A / 5B backs
PostPosted: Tue Oct 20, 2020 8:43 am 
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Victor V
Joined: Mon May 13, 2013 2:04 pm
Posts: 2329
I've dug around and found four original No 5B backs in usable condition all flat with no cracks . they are the same price as the new aluminium backs £30 + post

I've listed one on eBay

viewtopic.php?f=14&t=47200

the first bid secures if I am around to sell when it happens !

the other 3 are pictured here , the brass back has no model number on and has had the venturi removed but this can be replaced by one from a broken part , the brass backs are bizarrely very rare and I don't know why they were made

There are two insets which will go with the first ones sold :D

email rather than PM as the PM doesn't get sent on


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