how about grounded grid ?
Bob can you get better isolation with a vaccuum tube cascode than a
solid state cascode ?
-glen
On 07/07/2022 15:22, Bob kb8tq via time-nuts wrote:
Hi
On Jul 6, 2022, at 1:53 PM, Richard Karlquist via
time-nuts<[email protected]> wrote:
The 2N5179 has high base spreading resistance (decreases isolation).
As does sticking a resistor (even a small one) in series with the base …. Yes,
inductance
is even worse.
For “best isolation” in a cascode you very much want the base of the common base
stage nailed to ground. Typically “lower” Ft transistors with a decent base
structure
are the best choice for the common base stage. Both stages benefit from low 1/F
noise
in the audio range if this is for a phase noise test se
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