Phil Allison wrote:
Michael Terrell wrote:

Phil Allison wrote:
wrote:

I was looking at some old 813 tubes that were once commonly used for
Amateur radio transmitters, as the final output tube. While the common
audio output tubes like 6L6 and 807 can produce about 25 to 30 watts
audio output (per tube), running around 300 to 450 volts plate voltage,



** Versions of the 6L6GC made by RCA and Sylvania can be operated in pairs in class B with 700V on the plate and 400V on the screens.

Audio output power can be 100W per pair in this mode, with low distortion.

EL34s can also be used the same way to deliver 100W.

Guitar amps made by MusicMan and Dynacord are commercial examples.


He asked about the 6L6,


** The OP asked about "common audio output tubes" which the original 6L6 is not.

It's an all metal, museum piece.

6L6GCs have been the most common type sold for audio use for decades.



Yes, but the 'Amateur radio transmitters' he's talking about are from
the '40s and '50s, which were shipped with the original metal 6L6, not
the later glass versions. A lot of them were built with W.W. II surplus
tubes, of which the 6L6 was readily available as surplus into the '70s.

We aren't talking about stereos or guitar amps. The were audio
outputs for radios, or modulators for medium power AM transmitters
designed for Amateur radio service. I was servicing these radios back in
the '70s. That is four decades ago.


--
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They don't get mad.

They don't get even.

They go for over unity! ;-)