3 Sep
2008
3 Sep
'08
11:19 p.m.
On 3 Sep 2008 at 22:45, Brent Hilpert wrote:
Well, that was the hitch. I was looking at using a 6X5
(ind. heated)
but it was insufficient due to the fact that there is a polarization to
the H-C V limits (weird, but it's there, something to do with the oxide
formation I'm guessing).
Well, there are always the gas rectifiers (0Z4) with no need for a
heater supply, but generates a lot of RF "hash". Or the line-voltage
heater (e.g. 117Z6) variety of rectifier, allowing you to dispense
with a filament transformer altogether.
Or you could just drop a couple of strips of aluminum into a solution
of bicarbonate of soda...
Didn't know anybody was making them still. I could
try scavenging a
selenium rect at the radio museum, but the old ones I run across are
usually in questionable condition.
ISTR that selenium rectifiers degrade when they're not being used and
need to be reformed by operating under a load for a time. Sort of
like wet electrolytics. Tony or Will might remember more on the
subject.
Me, I could never stand the smell of one going south.
Cheers,
Chuck