[Boatanchors] [Glowbugs] Heater choke
wh7hg.hi at gmail.com
Wed Mar 9 22:42:34 EST 2011
From: Bill Henderson [mailto:Bill.Henderson at ocdsb.ca]
The main page is found at:
In reference to a branch conversation, its still there. Maybe no one told
them we moved. Maybe this is a separate entity. Maybe the BOFH is off duty
The 9 tubes tested for a prospective amp article:
First off, the title is misleading. It doesnt use 9 tubes; it can be used
with nine different types of tubes. Maybe more. Instead it reminded me of
a conversation a while back about using receiving tubes in amplifiers
(grounded grid?) which I thought was pretty cool and I was picturing using
nine of them across and trying to imagine the impedance matching fun. :-)
Anyway, this is one of those food for thought articles as is the one on
junk box amps. Definitely something upon which to ponder most heavily. But
then, I do everything most heavily. :-)
Aside from the 1625s being held for restoration of command equipment, the
closest thing I have to a power tube is a couple of RK34 dual triodes and
some 829Bs (and a 5984, IIRC). The 829B didnt receive real high marks in
the tests although might have fared better if the max rated B+ (750v) had
been approached. 460v is pretty wimpy for that tube. I have to go back and
see if I missed something about that.
Being one of the 100 watts (out PEP) is more than enough for anyone crowd
(and I know Im gonna get a glower and/or drive-by shunning or two for
that), some of the other tubes are of interest but only at reduced B+. Oh,
well. Im used to it. The glowers and drive-by shunnings, that is.
These are among my all time favourite articles for reference in this area.
Thank you for sharing them. :-)
Michael, WH7HG BL01xh WPE3ARS, ex-KN3MXO, ex-K3MXO A&P PP BGI LS/MFT
Whirled Infamous Author and all around really strange person
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