[ARC5] Speaking of Tetrodes for Triodes...

[Michael]

-----Original Message-----
From: arc5-bounces at mailman.qth.net [mailto:arc5-bounces at mailman.qth.net] On
Behalf Of arc5 at ix.netcom.com
> Trying again to send this... wonder what's going on??

Worked the first time, just didn't have anything to say then.  :-)

> I have been testing inexpensive substitutes for the "audiophool" tubes
> used in SCR-183.  

Gosh, I wish I had one or two (and a set of coils) to work with too.  The
loathsome creatures have driven the prices of all the needful tubes to being
hollow state gold.

> Triode-connected 6AQ5 or that jumped-up version, 58summthin-summthin, seem
to be the > best so far, 

6001 or another one with which I'm unfamiliar?  There's also the 2E30 that's
related to it and is intended for RF.  It is a quick heating tube so I don't
know if that counts.

> I've been thinking of tapping-off B+ at the cold end of the tank circuit
and
> running screen voltage to them through an appropriate resistor to see
> if I can get more "oomph."  

Hmmm ... wouldn't it be better to leave it triode connected to keep things
simple?  If you're going to go to the trouble of adding the screen, may as
well consider the 837 that the GF used.  

> I'm certain it will change the neutralization, but I'll deal with that
later.  

Just about everything you do will, won't it?

> Any comments on this?

This is a project in which I have a bit of interest, Dave, so please keep us
posted.  I'm hoping to find two BC-A*-230s, one for this that's restorable
to join in on this and one "parts or pervert" one to play with.  (This is on
top of the GF/RU rig which is a whole separate project.)  

So many projects await my chewing through these latest leather restraints!

Best regards,
 
Michael, WH7HG BL01xh
http://www.nationalmssociety.org/chapters/NTH/index.aspx 
http://wh7hg.blogspot.com/ 
http://kludges-other-blog.blogspot.com 
Hiki Nô!