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Vintage Television and Video Vintage television and video equipment, programmes, VCRs etc. |
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13th May 2022, 8:22 pm | #1 |
Hexode
Join Date: Sep 2019
Location: Crystal Palace, Bromley, London, UK.
Posts: 417
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Plating on Bush TV22 steel parts and screws?
Hi,
Does anyone know which type of plating was used for steel parts and screws in the Bush TV22 (and surely in many other TVs and radios of the same period)? The photo below shows parts from the TV22 Mk.2. Some of the parts have a yellow tint to them (they all came from a late Mk.2 scrap chassis). Now, I tend to clean parts that have excessive rust (mostly screws), usually by wire brushing and sometimes sanding, which removes the rust but also the remains of the original plating. Today I was thinking that doing this can actually be dangerous in case the screws are cadmium plated. - Helder |
13th May 2022, 8:43 pm | #2 |
Dekatron
Join Date: Aug 2007
Location: W.Butterwick, near Doncaster UK.
Posts: 8,923
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Re: Plating on Bush TV22 steel parts and screws?
Do not think those bits are cadmium plated, unless someone knows better?
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13th May 2022, 9:01 pm | #3 |
Octode
Join Date: Jan 2009
Location: Falmouth, Cornwall, UK.
Posts: 1,987
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Re: Plating on Bush TV22 steel parts and screws?
Could equally be zinc plated with a chromate element, this produces the same yellowing effect and was widely used.
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Stephen _________"It`s only an old telly" ___ |
13th May 2022, 9:11 pm | #4 |
Hexode
Join Date: Sep 2019
Location: Crystal Palace, Bromley, London, UK.
Posts: 417
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Re: Plating on Bush TV22 steel parts and screws?
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13th May 2022, 11:10 pm | #5 |
Dekatron
Join Date: Jan 2012
Location: Brentwood, Essex, UK.
Posts: 5,316
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Re: Plating on Bush TV22 steel parts and screws?
I still have a few NOS cadmium plated bolts and their finish looks nothing like the items in the photo.
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15th May 2022, 9:43 am | #6 | |
Hexode
Join Date: Sep 2019
Location: Crystal Palace, Bromley, London, UK.
Posts: 417
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Re: Plating on Bush TV22 steel parts and screws?
Quote:
https://www.ebay.co.uk/itm/154516616...mis&media=COPY I guess that in practice it may be hard to distinguish old/dull zinc from old/dull cadmium. Perhaps the best way to test this (other than by X-ray spectroscopy) is by building a small "battery" with the help of some electrolyte and another metal with a well-known electrode potential - I remember reading about this somewhere (perhaps here on the forum). - Helder |
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15th May 2022, 9:57 am | #7 |
Dekatron
Join Date: Sep 2011
Location: Rugeley, Staffordshire, UK.
Posts: 8,809
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Re: Plating on Bush TV22 steel parts and screws?
In my Thorn Automation days the company made equipment for the admiralty and the standard finish for all chassis parts was 'cad & pass', in other words cadmium plated and passivate dip. It looked a gold/yellowish colour with a 'petrol on water' kind of rainbow effect here and there. My guess is that is what you have there. In fact now I think about it there was an album by the band Family in the early 70s called 'Bandstand' where the cover was a true photo of a Bush TV 22 front and back, it even had a 'celluloid' screen!. And on the back cover the rainbow effect on the chassis is plain to see.
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A digital radio is the latest thing, but a vintage wireless is forever.. |
15th May 2022, 10:17 am | #8 | |
Hexode
Join Date: Sep 2019
Location: Crystal Palace, Bromley, London, UK.
Posts: 417
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Re: Plating on Bush TV22 steel parts and screws?
Quote:
- Helder |
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15th May 2022, 10:20 am | #9 |
Dekatron
Join Date: Jun 2005
Location: Warnham, West Sussex. 10 miles south of DORKING.
Posts: 9,145
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Re: Plating on Bush TV22 steel parts and screws?
The finish code for EMI 1937. Bush probably used the least expensive bolts just for light assembly. J.
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15th May 2022, 10:32 am | #10 | |
Hexode
Join Date: Sep 2019
Location: Crystal Palace, Bromley, London, UK.
Posts: 417
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Re: Plating on Bush TV22 steel parts and screws?
Quote:
- Helder p.s. - Just noticed the finishing codes below... Last edited by Helder Crespo; 15th May 2022 at 10:34 am. Reason: added p.s. |
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16th May 2022, 9:31 pm | #11 |
Dekatron
Join Date: May 2003
Location: Edinburgh, UK.
Posts: 3,273
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Re: Plating on Bush TV22 steel parts and screws?
Hi Helder,
Thanks to Jac Janssen we do have the complete set of EMI finishes. Oops, John got there first. Peter |
16th May 2022, 10:23 pm | #12 | |
Hexode
Join Date: Sep 2019
Location: Crystal Palace, Bromley, London, UK.
Posts: 417
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Re: Plating on Bush TV22 steel parts and screws?
Quote:
This is even more comprehensive than John's table. Is Bush/Rank supposed to have followed EMI's finishes? If so, then i believe the most likely finish for the parts I mentioned is White Nickel. - Helder |
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17th May 2022, 6:43 pm | #13 |
Dekatron
Join Date: Jun 2005
Location: Warnham, West Sussex. 10 miles south of DORKING.
Posts: 9,145
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Re: Plating on Bush TV22 steel parts and screws?
EMI were crazy with their over the top detail for something that was obsolete after 10 years. It probably had a lot to do with their collapse of domestic radio and TV production. J.
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