[Amps] Specification for 3-500 grounded-grid grid bypass caps?

[GGLL]

	Mylar?, those cylindrical made of rolled aluminium foil?. I thought Mylar was
not good beyond 20 MHz. Siver mica or good quality disk ceramics are best
options. You may increase the value, but that sure would be better explained
by the brilliant minds (with the exception of the writer's) present in this forum.

Best regards
Guillermo - LU8EYW.

Geert Jan de Groot escribió:
> For restauration work on a SB220 I'm looking for specs of
> suitable replacement caps for the grid bypass.
> In the SB220, each of the three grid-pins is connected by a
> 200p mylar cap to ground.
> 
> mylar caps are not easy to obtain these days.
> I have no idea what kind of volts, amps or other specs these caps
> need to be?
> 
> I'm a bit surprized by the circuit anyway - can someone please explain
> why the grid of a G-G amplifier isn't connected to ground, but
> connected by a 1mh choke and bypassed by 3 200p C's instead?
> 
> 73,
> 
> Geert Jan PE1HZG
> 
> 
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