KL-1 / KS-1

[Glen Zook]

Most of the "boat anchor" transmitters measure the
"plate" current in the cathode circuit.  When that is
done, you have to subtract the screen current (if the
tube or tubes have more elements in them than triodes
have).  For example, in the Heath Apache or DX-100 you
have to subtract the approximate amount of 25 mA to
account for the screen current.

If the high voltage rectifier has a center-tapped
filament then you can put the "plate" meter in this
circuit if the final amplifier tube(s) are operating
in grounded grid.  Or, if the cathodes are not
returned directly to ground, you can lift the cathode
lead and insert the "plate" meter there.  Just make
sure that the proper value of bypass capacitor is in
place to take care of "stray" r.f.

By putting the meter in the cathode circuit you are
definitely reducing the voltage on the meter.

Glen, K9STH


--- Gregory S Poel <gspoel at CMSENERGY.COM> wrote:

I'm interested in trying to measure the plate current
somewhere other than in the B+ lead, does anyone have
any suggestions?

=====
Glen, K9STH

Web sites

http://home.comcast.net/~k9sth
http://home.comcast.net/~zcomco

__________________________________
Do you Yahoo!?
Find out what made the Top Yahoo! Searches of 2003
http://search.yahoo.com/top2003

-----------------------------------------------------------
Products bought, sold or traded here is the responsibility of the
parties involved.  This list and the City of Tempe are not responsible
for losses or misrepresentations of any kind.  Buyer beware!

-----------------------------------------------------------
This list is a public service of the City of Tempe, Arizona
-----------------------------------------------------------

Subscription control - http://www.tempe.gov/lists/control.asp?list=HEATH
To post - HEATH at LISTSERV.TEMPE.GOV
Archives - http://interactive.tempe.gov/archives/HEATH.html