Gregg wrote:
You're kidding, right?

The 807 was the most-used amplifier tube in history. It still beats the
6146 in popularity, given the time it was used. From audiophile tube amps,
to RF modulators to RF linears and class-C self excited power oscillators,
the 807 was/is there :-)

RF schematics are all over. Check Google, check the ARRL Handbook, CB
websites and pirate radio websites.

Russia and China still make it. Russian ones are the best and called
G-807.

If you want to play with an 807 at audio, for all practical purposes, it's
a 6L6GC ;-)

There are MANY variations on the 807. The 807 is actually a 6L6G with
a plate cap. The 6L6GC has a bit more plate rating than the 6L6.
The 6BG6G/6BG6GA sweep tube is an 807 with an octal base, minus some
sheilding.
The 1625 is an 807 with a medium 7 pin base and a 12.6 volt heater.
The 807W is a smaller squat glass version of the 807 that is more
rugged. It can be pushed harder.

Some 1625's and 807's had the beam deflection plates (suppressor)
brought through the glass with their own wire lead connected to
the cathode at the base. You can debase these tubes and connect the
suppressor to it's own pin (1625) or tie it to one of the
grids (807) and then run the tube in true grounded grid operation.
There were quite a few linears in the 50's built this way.

I recall one amp used a voltage quadrupler to get 600 volts from
the 120v ac line and had 10 tubes with the heaters wired in series.
One tube was a driver, and 9 were grounded grid finals.
(A bit of a shock hazzard perhaps.)