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Fake transistors. |
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kedwardsleisure 
Old Croc 
Joined: 20 January 2009 Location: Staffordshire Status: Offline Points: 5157 |
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 Posted: 22 September 2023 at 8:35pm |
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except they spelled semelab wrong
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Kevin
North Staffordshire |
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EmPro
Young Croc 
Joined: 26 June 2020 Status: Offline Points: 992 |
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Posted: 22 September 2023 at 9:23pm |
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Indeed but the devices are proper
 have a look: |
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EmPro Audio
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jbl_man
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Joined: 12 January 2005 Location: London. Status: Offline Points: 11308 |
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Posted: 23 September 2023 at 10:46am |
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I always wondered why the baseplate of a TO3 wasn't made out of copper or aluminium to aid themal conduct.
The first ones were made around 1955, interestingly the pin spacing was so they could fit into standard valve sockets used at the time!
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Be seeing you.
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EmPro
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Joined: 26 June 2020 Status: Offline Points: 992 |
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Posted: 23 September 2023 at 10:55am |
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They where made of aluminium before....but expensive to made...so they quit good materials and......
 Edited by EmPro - 23 September 2023 at 10:56am |
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EmPro Audio
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madboffin
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Joined: 03 July 2009 Location: Milton Keynes Status: Offline Points: 1720 |
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Posted: 26 September 2023 at 6:23pm |
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Langrex (yitry on ebay) have been in business for decades and are widely regarded as trustworthy. I remember visiting their trade counter in about 1970 when they were in Streatham, not far from where my grandparents lived.
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kedwardsleisure
Old Croc
Joined: 20 January 2009 Location: Staffordshire Status: Offline Points: 5157 |
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Posted: 01 October 2023 at 8:22pm |
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I've got quite a few NOS aluminium TO-3 transistors, very lightweight. ISTR when LM338K regulators were all the rage (5A) they were aluminium to start with then changed to nickel-plated steel and were sold as LM338K-STEEL to emphasize the change. Not sure how it affected their performance.
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Kevin
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