On Nov 11, 2006, at 4:24 AM, pentalab wrote:
--- In ham_amplifiers@..., R L Measures <r@...> wrote:
After my first 3-500 amp when I was 16 I always used sockets
and chimneys.
RICH SEZ.... Air system sockets and chimneys result in higher glass
temperatures than is the case with the transverse-fan cooling
system used in the SB-220 and TL-922.
### Nonsense. Depends on airflow... and speed of fan..or blower.
You def will get better, more uniform cooling with a blower and
chimneys... PROVIDED u use vertical finned anode connectors. With
chimneys... u def get better cooling of the pins.
The marking ink does not change color in a SB-220 if the fan is oiled every 1000-hours or so.
I always felt it allowed the envelopes of the tubes to evenly
cool around the tubes. The tube pins get coolest direct air.
RICH SEZ... So why does the Henry 3K-A, which uses air-system
sockets and chimneys, have a history of melting solder out of tube
pins #1 and #5 ?
### Dunno... my guess is, since the 3K-A runs 4 kv.. and >2 kw
out...
The 2K-4 does the same thing.
that some bozo at Henry screwed up. Maybe they use lousy
sockets.. with too much contact resistance. Who knows. Their
anode connector's may well be a problem. Lot's of homebrew 3-
500Z amps with chimney's... never a problem.
Hotter glass isn't usually a problem, the point is that horizontal air-flow results in lower temperatures and less acoustical noise because a high-pressure centrifugal blower makes more noise than a fan.
.
R L Measures, AG6K, 805.386.3734
r@..., rlm@..., www.somis.org
