I was thinking of building a simple rig again but with a 1625 in the
final.
I have about a dozen of these bottles in the junk box ....

When I find the right round tuit I want to use TEN 1625's with their
filaments series'd across the 120 VAC line in a simple CW rig. Can't
find it right now, but somewhere around here I have an article from
an old radio magazine describing just such a transmitter.

IIRC, the capacitance from ten tubes limited it to the lower HF band(s),
but it still seems like an easy way to get 750 watts!
--
--Myron A. Calhoun.

Hey, Man, I don't know about TEN 1625's, but I did try five 1625's (in
parallel, of course) and could work up to 40 CW....... (as an American in
France, F7CT). Almost 1000VDC on the plates, and they did get pretty rosy
on a long "dah". 1625's could be drawn by the basket full from the MARS
storeroom at Toul Rosieres Air Base, France. 1962......1963?
Old Chief Lynn...... W7LTQ

Lynn Coffelt wrote:
I was thinking of building a simple rig again but with a 1625 in the

final.

I have about a dozen of these bottles in the junk box ....

When I find the right round tuit I want to use TEN 1625's with their
filaments series'd across the 120 VAC line in a simple CW rig. Can't
find it right now, but somewhere around here I have an article from
an old radio magazine describing just such a transmitter.

IIRC, the capacitance from ten tubes limited it to the lower HF band(s),
but it still seems like an easy way to get 750 watts!
--
--Myron A. Calhoun.


Hey, Man, I don't know about TEN 1625's, but I did try five 1625's (in
parallel, of course) and could work up to 40 CW....... (as an American in
France, F7CT). Almost 1000VDC on the plates, and they did get pretty rosy
on a long "dah". 1625's could be drawn by the basket full from the MARS
storeroom at Toul Rosieres Air Base, France. 1962......1963?
Old Chief Lynn...... W7LTQ


Let's see... the output C of an 807 (1625 is the same) is 7pf, the input C
is 12pf. With 10 tubes thats 70pf output and 120pf input. Won't work
at all on 10m, and iffy on 20. Would be fine on 80 and 40.