182
WhitakerAudio
R
g
2
= minimum value for the voltage-dropping resistor in ohms
E
c
2
= selected screen grid voltage in volts
E
cc
2
= screen grid supply voltage in volts
P
c
3
= screen grid input in watts corresponding to
E
c
2
10.1.2 6973 Beam Power Tube
The 6973 is a 9-pin compact beam power tube used in high-fidelity audio equipment. Operating
characteristics are charted in Figure 10.3. The device pinout is given in Figure 10.4.
This curve also applies to types
in which grids #2 and #4 are connected
together within the tube
Grid #2 input expressed as a percentage of maximum grid #2 input rating
100
80
50
40
20
0 20 40 60 80 100 120
Grid #2 voltage expressed as a percentage of maximum
grid #2 supply voltage rating
Area of
permissible operation
Figure 10.2
Grid #2 (screen grid) input rating curve.
Plate volts
Plate volts
Type 6973
grid #1 = 0 V
with E
variable
c2
Type 6973 grid #2 = 250 V with E variable
c1
Plate milliamperes
0 100 200 300 400
0 100 200 300 400
Plate (I ) or grid #2 (I ) milliamperes
b c2
175
150
125
100
75
50
25
175
150
125
100
75
50
25
(
a
)
(
b
)
Figure 10.3
Characteristic curves of the 6973: (
a
) with the voltage on grid no. 2 variable, (
b
) with
the voltage on grid #1 variable.
Summary of Contents for JC Whitaker 20 W Stereo Integrated Audio Amplifier
Page 1: ...20 W Stereo Integrated Amplifier WhitakerAudio 20 W Stereo Integrated Audio Amplifier ...
Page 11: ...11 20 W Stereo Integrated Audio Amplifier Figure 1 1 b ...
Page 16: ...16 WhitakerAudio Figure 1 2 b ...
Page 20: ...20 WhitakerAudio Figure 1 3 Power management circuit for the 20 W integrated stereo amplifier ...
Page 38: ...38 WhitakerAudio Figure 3 1 Component layout for the Amplifier PWB 1 right board ...
Page 40: ...40 WhitakerAudio Figure 3 2 Rectifier PWB component layout ...
Page 45: ...45 20 W Stereo Integrated Audio Amplifier Figure 3 4 Layout of the speaker terminal PWB ...
Page 84: ...84 WhitakerAudio Figure 5 6 Power management PWB a component side b foil side a b ...
Page 188: ...20 W Stereo Integrated Amplifier WhitakerAudio 20 W Stereo Integrated Audio Amplifier ...
Page 196: ...196 WhitakerAudio ...