[Amps] a7/z7 ??

[George T. Daughters]

Hi,

Rich always points out that the 3cx1200z7 has much less feedback 
capacitance than the 3cx1200a7, yet the (CPI) Eimac reference data 
pages say (and something here doesn't seem right!!)

a7 grounded cathode input=20pf, output=0.2pf, feedthrough=12pf

z7 grounded grid    input=18pf, output=9.7pf, feedthrough=0.8pf

Does anybody have an apples/apples comparison?  My archives don't 
have data for any of these "new" tubes.

73,

George T. Daughters, K6GT