> On Dec 29, 2020, at 14:33, Benjamin Deovlet via Amps <amps@contesting.com>
> wrote:
>
> I used MFJ 811A tubes in my Collins 30L-1 amplifier. Apparently they aren't
> suitable for horizontal mounting.
I’m not where I can look it up, but there are notes in handbooks about which
pins should in a vertical line.
Something about sagging filament or grid.
Guess newer manufacturers messed with the internal structure.
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