To echo Jim's comment
I recently redid AL82
the RF Parts 3-500, while Chinese are tested and perform GREAT!
impressive even
solid tube, my take is amp/tubes will out last me and next owner
73 Robert
On Wed, Dec 7, 2022 at 11:27 AM jim.thom jim.thom@telus.net <
jim.thom@telus.net> wrote:
> Don't even think about installing CHINESE 811'a horizontally into any
> 30L1. Cathodes will sag..and short. The only thing that will work in a
> 30L1 is chinese 572B's.
>
> Chinese 811's are piss poor at the best of times, they don't hi-pot test
> very high. Typ on ameritron AL-811 amps, 572B's are used for tube
> replacements.
>
> Rob nailed it. Stick with old school 3-500Z amps. They are very easy to
> maintain, and easy to modify and upgrade. Stay away from megabuck tubes
> like 8877, 3CX-800's etc. Both have floozy grids, and require grid
> overcurrent protection. I would stay away from russian tetrodes and
> triodes as well.
>
> Jim VE7RF
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