[Amps] 3CX1500A7 versus 3CPX1500 TSPA

[John T. M. Lyles]

With all the hoopala here questioning honesty of selling various 
8877-style triodes as interchangable, I didn't see mention of whether 
the pulsed tube (having a longer anode ceramic) would have the same 
Cpg, output capacitance. This may make a big difference in a 
particular amplifier, esp at the higher frequencies. Beside the 
obvious of it sticking up higher in the socket, the tuning may get 
offset by the fixed tube capacitance, something to be aware of. Moot 
point, since it was sold already, but be careful of interchangeable 
sockets without heeding noninterchangeable tube characteristics.

73
John
K5PRO