[Hallicrafters] SR-Series?

[Sandy W5TVW]

> On Wednesday 13 February 2002 11:40, Fred Olsen wrote:
> > > W2AGN wrote:
> > > Excuse please. A 50L6 is a 6L6 with w 50 volt filament.
> >
> > Sorry, you are mistaken.  A 50L6 is NOT equivalent to a 6L6, or to a
> > 6V6.  It is a beam power pentode, but there the similarity ends.  A
> > 50L6GT (25L6GT) is about a 200V 10W tube.  An essentially similar tube
> > is the 50C5, the miniature successor.
> >
>
> --
>
> Well, I just went and checked, and I'll stand by what I said. A 50L6 is a
6L6
> with a 50 volt filament. A 25L6 is a 6L6 with a 25v filament.


Sorry!  WRONG, WRONG, WRONG!

Check your tube manuals carefully.....

Look at maximum plate voltage and plate dissipation ratings, this is where
the "meat" of the tube is at!

6L6, 6L6G, 6L6GB all are 360 volts max., and 19 watts dissipation.
25L6 and 50L6 are 200 volts max., and 10 watts.
35L6 is 200 volts max and 8.5 watts.

There is a legion of derivatives of the 6L6: 5881, 7027, 6550, 6BG6-G, 807
just to name a few.

None of these is up to what a 6L6 will permit!  The 6L6 is the FIRST
beam power tetrode and has a long family line of permutations.  The 807
is nothing more than a 6L6G with a different base and plate connection
brought
out via the topcap.  Some additional RF shielding was also incorporated.
The 6BG6-G is like a 6L6 with a topcap for the plate. All are direct 6L6
permutations.  Why they called the 25L6, 35L6 and 50L6 what they did,
is beyond me other than they were "junior" versions of the 6L6 BUT NOT
RATED the same.  An examination of the electrode structure will also
tell you that.  There "ain't no beef" in the high voltage heater versions!
If I were to replace the 50L6 with a 6 volt equivelant, I would indeed
choose the 6V6 or the miniature 6AQ5.

Sorry for the flames, but I couldn't let that one go by, it's inaccurate
information.
73,
Sandy W5TVW