never be forgotten. Looking at Fig. 11.3 we see that if R were
increased to a much larger value the load line would have to swing
round until it was nearly horizontal, cutting the valve curves at
points where their decreased slopes would mean much larger values
I I |μ OF
VALVE
(THEORETICAL
UPPER
LIMIT
OF
AM
PLIFICATIO
f
Ν.
fN—ι
—
ι ;
! 1
-44t
s
x
1~
4-
*
Ν
—i~
ι—
\
c
ο
C
Σ
α
Σ
ANODE
RESISTANCE,/?
Fig. 11.6 The full line shows how the voltage amplification depends on the value of
load resistance R. It is calculated for a valve with μ = 39 and r
a
= 14.5kQ. The dashed
line shows the peak milliwatts delivered to R for a grid input of 1 V pea
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