[Amps] proper label

[Bill L. Fuqua]

Well, common grid or grounded grid(s) would still apply. Both grids in a tetrode tube would modulate the electron current. The advantage comes from the inherent negative feedback in this mode which improves the linearity.  The plate current is almost identical to the cathode current in biased tetrodes. They should be more linear than HI Mu triodes due to the lack of large amounts of grid current.
 
73
Bill wa4lav


-----Original Message-----
From: skipp isaham <nospam4me@juno.com>
To: amps@contesting.com
Date: Thu, 24 Oct 2002 17:38:00 -0700 
Subject: [Amps] proper label

Hello there, 
-
Here's the 50 cent question for the week. First the 
circuit description. 
- 
A tetrode in grounded grid service needs an 
operational label.  Said tetrode has the screen 
grid (directly strapped) and cathode (through 
chokes) at DC ground, the cathode has RF applied 
through a tuned circuit. 
The control grid is signal grounded, but has 
dc bias though chokes and bypass caps. 
- 
Does one consider the ac signal grounded 
grids a reason to label the circuit a triode mode 
operation? 
Does the presence of a screen potential with 
respect to the cathode change the mode 
label..?
-
Forget the low and high mu label for the reply, 
just consider the mode label we would apply 
to an operating (low gain circuit) tetrode with 
the cathode and screen grid potentials near 
zero (grounded). 
- 
Should we just call it a tetrode circuit in low 
gain operation..? 
- 
Your 50 cent opinion please
-
cheers
skipp

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