What is PTT216?
I have this tube in my pile of NOS tubes.
It's made by CSF France, is a penthode, 9 pin short
Box marked P.T.T. 216
Does anyone of you know what it is? It's one of 2 tubes I have and know nothing about.
The PTT 216 is one of the many types developped for the postal services.
Vf 6.3V 0.3A
Rg1 Max 50KOhm
Pg2 Max 0.75W
Pa Max 2.25W
Thank you :)
Weird tube, never seen such a pin configuration before.
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