At 20:41 20/3/2006 +0000, you wrote:

> I think what Costas was getting at is that the 6L6
> was the grand daddy of all beam power tetrodes including
> the 807, 6146 etc. Yes the 807 has higher voltage and
> frequency rating than the 6L6 but both valves share
> a common architecture.

Yes, this is the meaning of my posting. In addition,
6L6 and 807 have the same design approach with
long internal wires etc. 6146 was designed as an
RF amplifier and is much more compact.

Regarding power levels, the 6 W stated for 6L6
is for class A audio. You can get much more from
a class C circuit. Maximum plate dissipation is
30 W maximum for 6L6CG. Strangely, 807W is rated
at 25 W and 6146B at 20W. The data is from Sylvania.
Of course at 30 W dissipation a 6L6 would not
last long! 1987 ARRL handbook rates 6146 at 25 W
max plate dissipation.

My first HF transmitter had a 6L6 delivering 15-20 W
CW on 7 and 10 MHz.

Regards, 

Costas



 +------------------------------------------------------------+
 | Costas Krallis SV1XV      *   LOC KM18UA                   |
 | P.O.Box 3066              *   E-Mail:                      |
 | GR-10210 Athens           *   PGP key: 0xEF65B04B          |
 | GREECE                    *   http://www.qsl.net/sv1xv/    |
 +------------------------------------------------------------+