I have one, if anyone is interested. I've just joined Audiogon. My father left me quite a collection of tubes (valves) dating back to the 1930's but most being in that wonderful late 1950's to early 1970's range.
The Marconi B65 I have is stamped FM 4, has a metal base and tests 100%. I'm not sure of it's origin but it may have been salvaged from a pretty high-end audio amplifier. From the tests we have done it has plenty of life.
If you want to know more send me an email at grunta57@gmail.com.
I have a great many other tubes available here too, too numerous to list
Thanks
Grant
The Marconi B65 I have is stamped FM 4, has a metal base and tests 100%. I'm not sure of it's origin but it may have been salvaged from a pretty high-end audio amplifier. From the tests we have done it has plenty of life.
If you want to know more send me an email at grunta57@gmail.com.
I have a great many other tubes available here too, too numerous to list
Thanks
Grant