10-03-2016, 10:02 PM
Some manufacturers originally used a thinner centre pin to get the 75 ohm impedance match. The matching 75R sockets can definitely be damaged by 50 ohm plugs. I have done it!
There was also one type that had a very needle-like pin not a blunt pin for the 75R version. But all this became immaterial when the manufacturers realised that all they had to do was remove the ptfe insulating collar round the pin in the 50R plug section and bingo, 75R with the same pin diameter, using air dielectric.
So the only mix that causes problems is 50R plugs into any original thin-pin sockets.
Simples...
Jeremy
There was also one type that had a very needle-like pin not a blunt pin for the 75R version. But all this became immaterial when the manufacturers realised that all they had to do was remove the ptfe insulating collar round the pin in the 50R plug section and bingo, 75R with the same pin diameter, using air dielectric.
So the only mix that causes problems is 50R plugs into any original thin-pin sockets.
Simples...
Jeremy
Jeremy. G8MLK. BVWS Chairman. British Vintage Wireless and TV Museum Friend.
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