[Boatanchors] EF Johnson thunderbolt

[Rob Atkinson]

You need to find out what's causing the oscillation and shut it down
instead of running through chokes.  One idea is to make sure ground
bonds to chassis are all low resistance, i.e. around 1/2 ohm.

73
Rob
K5UJ

On Sun, Jul 4, 2021 at 10:21 AM KA2PTE <ka2pte at 3950.net> wrote:
>
> Curious if by chance anyone has any of the 2.5mH RF chokes used in this amp?
> L8,9 and 10 are all the same.
> https://www.mediafire.com/view/4mu4pddwi7vacxu/L8.jpg/file
>
> I got some new ones at RF parts.com, but am on my last one as I have a
> parasitic osc from tuned grid to plate happening that is eating these up.
>
> --
> Steve Hearns
> KA2PTE