- Joined Jun 4, 2014
I wa watching a film when the radar operator had a problem with his equipment. He called out "Bring me a 12SN7!". This immediately awoke memories of long ago and I could recollect that a 12SN7 is a double triode with a 12V heater. I was surprised at this detail as there can't be many around that would recognise this valve (or vacuum tube if you prefer).