> Any dowside risk to gutting the grid cap/choke circuit in the L-7 and
> replacing them it Cu straps between the grid terminals of the socket
> and chassis? Will this affect the termination impedance that the tuned
> input sees significantly?
There are always risks when we change things in marginally stable
systems unless you just buckle down and do everything correctly.
If I owned a 30L1 I'd use "cathode" bias and ground the grids
normally, and add neutralization. I'd never use four 811A tubes in
parallel without cancelling feedthrough capacitance.
73, Tom W8JI
FAQ on WWW: http://www.contesting.com/FAQ/amps
Administrative requests: amps-REQUEST@contesting.com