MAXIMUM RATINGS
(Design Centre Values)
|
Pentode Section
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Plate voltage (without current)
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550
|
volts
|
Plate voltage (see note 1)
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|
250
|
volts
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Plate dissipation
|
|
|
4
|
watts
|
Grid No.2 voltage (without
current)
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|
|
550
|
volts
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Grid No.2 voltage
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250
|
volts
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Grid No.2 dissipation
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|
|
1.7
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watts
|
Cathode current
|
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|
40
|
mA
|
External grid No,1 resistance
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|
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|
with
cathode bias
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|
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2
|
megohms
|
with
fixed bias
|
|
|
1
|
megohms
|
Heater-cathode voltage
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|
200
|
volts
|
External heater-cathode
resistance
|
|
|
20,000
|
ohms
|
Triode
Section
|
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|
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Plate voltage (without current)
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|
|
+-550
|
volts
|
Plate voltage
|
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|
+-250
|
volts
|
Peak plate voltage (see note 2)
|
|
|
600
|
volts
|
Plate dissipation
|
|
|
1
|
watts
|
Cathode current
|
|
|
12
|
mA
|
External grid No,1 resistance
|
|
|
|
|
with
cathode bias
|
|
|
3
|
megohms
|
with
fixed bias
|
|
|
1
|
megohms
|
Heater-cathode voltage
|
|
|
200
|
volts
|
External heater-cathode
resistance
|
|
|
20,000
|
ohms
|
Pentode Audio
Power Amplifier Class A (Single
Tube)
|
Plate supply voltage
|
|
200
|
250
|
volts
|
Grid No.2 supply voltage
|
|
200
|
250
|
volts
|
Cathode resistor
|
|
113
|
235
|
ohms
|
Zero-signal plate current
|
|
20.0
|
16.0
|
mA
|
Max.-signal plate current
|
|
18.5
|
15.0
|
mA
|
Zero-signal grid No.2 current
|
|
3.4
|
2.7
|
mA
|
Max.-signal grid No.2 current
|
|
5.4
|
4.3
|
mA
|
RMS signal input voltage
|
|
1.59
|
1.44
|
volts
|
Plate load resistance
|
|
10,000
|
17,500
|
ohms
|
Power output
|
|
1.65
|
1.65
|
watts
|
Total harmonic distortion
|
|
10
|
10
|
%
|
Pentode Audio
Power Amplifier Class AB Push-Pull
|
Plate supply voltage
|
|
|
250
|
volts
|
Grid No.2 supply voltage
|
|
|
250
|
volts
|
Cathode resistor
|
|
|
117
|
ohms
|
Zero-signal plate current
|
|
|
2x16.0
|
mA
|
Max.-signal plate current
|
|
|
2x18.0
|
mA
|
Zero-signal grid No.2 current
|
|
|
2x2.7
|
mA
|
Max.-signal grid No.2 current
|
|
|
2x4.7
|
mA
|
RMS signal input voltage
|
|
|
3.5
|
volts
|
Plate load resistance
|
|
|
17,500
|
ohms
|
Power output
|
|
|
5.4
|
watts
|
Total harmonic distortion
|
|
|
4
|
%
|
|
|
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1.
According to 1971 databook maximum plate voltage is 300 V
2.
With plate current less than 0.1 mA. Maximum voltage pulse
duration 18% of a cycle with a maximum of 18 usec.
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