Behold, David J Windisch signalled from keyed 4-1000A filament:

Hi, all concerned:

What's the nomenclature for that sweep tube, produced just for Admiral
TVs years ago, that's heavier-duty than any of the other tubes?

I thought it was 6MJ6 -- but, no.

Fella used to sell 'em in some of the mid-west hamfests, but I haven't
seen him for a while. Think his name is Don, and that he was also in to
Racal receivers.

TIA & 73

I know the Sylvania 6LF6 tubes, custom made for Motorola were heavier
duty - rated 50 watts Pa continuous........

--
Gregg
*It's probably useful, even if it can't be SPICE'd*
http://geek.scorpiorising.ca