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Old 16th May 2021, 11:14 am   #1
Steveatbath
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Default Valve Identification

Can someone identify these 3 valves in the photo please I was given a box of old radio valves but know nothing about them. One is marked "80" with 4 pins, another "75"with 6 pins, taped base, "made in England", and I think the third is Mazda PL36 with 7 pins. Thanks Steve
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Old 16th May 2021, 11:19 am   #2
Cobaltblue
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Default Re: Valve Identification

My goto is here

http://www.r-type.org/exhib/aaa0296.htm

http://www.r-type.org/exhib/aag0043.htm

http://www.r-type.org/exhib/aaa0350.htm

Cheers

Mike T
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Old 16th May 2021, 12:18 pm   #3
Radio Wrangler
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Default Re: Valve Identification

The type '80' is a very famous rectifier valve, used in an immense amount of American radio equipment in the late 20s into the early 30s and beyond.

It was supplanted by variants with international octal bases.

David
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Old 16th May 2021, 4:24 pm   #4
usradcoll1
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Default Re: Valve Identification

Quote:
Originally Posted by Radio Wrangler View Post
The type '80' is a very famous rectifier valve, used in an immense amount of American radio equipment in the late 20s into the early 30s and beyond.

It was supplanted by variants with international octal bases.

David
Another Dave chiming in!
They even made a locktal version. the 5AZ4!
Hallicrafters used the type 80 until the late 40's, even though the rest of the valves were octal based.
BTW, did Brimar actually make the US type valves or just rebadge US made valves? It looked like they did!
Dave, USradcoll1, just a thought.
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Old 16th May 2021, 5:06 pm   #5
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Default Re: Valve Identification

Brimar was a brand mane operated by STC (Standard Telephones and Cables) who in turn were a subsidiary of ITT.

They therefore had very strong US ties and no wish to affiliate with the 'Pro-electron' crowd operating the European numbering system, so they went with US type numbering. They certainly made valves, and it's a fair bet that they moved stocks across the Atlantic in either direction as production planning needed. I think they did develop some types themselves and got US type numbers issued for them.

David
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Old 16th May 2021, 5:17 pm   #6
turretslug
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Default Re: Valve Identification

BRItish-Made American Range. Though, as with other valve-makers/suppliers, there was no doubt a fair bit of second-sourcing/importing/optimal-branding going on.
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Old 17th May 2021, 1:20 pm   #7
Steveatbath
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Default Re: Valve Identification

Thanks for all the details from those with the knowledge. Can someone use these? I guess they don't have any great value and I'm happy to send them for the cost of postage. Steve
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