On Oct 29, 2006, at 2:45 AM, pentalab wrote:
--- In ham_amplifiers@..., Tony King - W4ZT <w4zt-
060920@...> wrote:
Pentalab wrote:
---
Some guy in W6 land wants me to design an amp around 3 x
YC-156's in parallel, GG... low band stuff. I figure with 600w
of drive.. it should do 30-36 k out.
Wow... well if one tube isn't enough... you need a BIGGER tube! I
can't imagine dealing with the problems of paralleling 3 YC-156's.
He needs a 15k or 20k!
Paralleling 3 tubes triples C-feedback, and that is not desirable unless one is trying to build an oscillator. The tube that is best suited for 20k - 35k out is the 8281/4cx15000A. 200w will drive one in AB1.
### Eimac wants get this $3200 for a 3 x 10.... Svetlana wants
$2200. Eimac wants $4500 for a 3x 15.... dunno what a
3x20 goes for. Reid at Eimac tells me in a e-mail... they now
make a 3CX-20,000C7.... socketless version of a 3x20. The SK-
1320 socket that fits all the above tubes is HUGE bux.... but a
LOT less in the Svetlana version.
### 3 x YC-156's is totally stupid.[11m ops have successfully
done it, they are obviously not stupid... maybe we should invite a
few of em to this group,
guffaw
...
R L Measures, AG6K, 805.386.3734
r@..., , rlm@..., www.somis.org
