Voltage - Triode (with diode, heptode or hexode) ·Diode-Diode-Diode-Triode
Triple-diode high-mu triode combining AM/FM detector or discriminator functions with voltage amplification. Three diode sections provide multiple signal and control-voltage rectification paths while the triode supplies subsequent audio-frequency gain.
Triple-diode triode for detection and low-frequency voltage amplification; source also designates 6AK8.
Small-button Noval 9-contact
General specifications
Properties common to every published source and operating point.
Electrical assignments shared by every tube using this base designation.
| Terminal | Section | Connection | Evidence |
|---|---|---|---|
| PIN11P3 | A | P — Plate (Anode) Original EIA source designation 1P3; manufacturer confirmation pending | Unverified EIA Base Connections, printed page 130, 9E |
| PIN22P | B | P — Plate (Anode) Original EIA source designation 2P; manufacturer confirmation pending | Unverified EIA Base Connections, printed page 130, 9E |
| PIN3IS | A | IS — Internal ScreenGroup 9E3 Original EIA source designation IS; manufacturer confirmation pending | Unverified EIA Base Connections, printed page 130, 9E |
| PIN32K | B | K — CathodeGroup 9E3 Original EIA source designation 2K; manufacturer confirmation pending | Unverified EIA Base Connections, printed page 130, 9E |
| PIN4H | — | H — Heater Original EIA source designation H; manufacturer confirmation pending | Unverified EIA Base Connections, printed page 130, 9E |
| PIN5H | — | H — Heater Original EIA source designation H; manufacturer confirmation pending | Unverified EIA Base Connections, printed page 130, 9E |
| PIN61P2 | A | P — Plate (Anode) Original EIA source designation 1P2; manufacturer confirmation pending | Unverified EIA Base Connections, printed page 130, 9E |
| PIN7IS | A | IS — Internal ScreenGroup 9E7 Original EIA source designation IS; manufacturer confirmation pending | Unverified EIA Base Connections, printed page 130, 9E |
| PIN71K | A | K — CathodeGroup 9E7 Original EIA source designation 1K; manufacturer confirmation pending | Unverified EIA Base Connections, printed page 130, 9E |
| PIN81G1 | A | G1 — Control Grid Original EIA source designation 1G1; manufacturer confirmation pending | Unverified EIA Base Connections, printed page 130, 9E |
| PIN91P | A | P — Plate (Anode) Original EIA source designation 1P; manufacturer confirmation pending | Unverified EIA Base Connections, printed page 130, 9E |
4 physical sections, each with unique specifications.
Section 1
Published ratings/characteristics promoted where clearly stated; repeated identical sections compressed where applicable.
Section 2
Published maximum ratings, representative operating characteristics, and capacitance columns reviewed.
Section 3
Promoted values and additional parameters were taken from the supplied Ferranti datasheet tables.
Section 4
Promoted values and additional parameters were taken from the supplied Ferranti datasheet tables.
Source-dependent data
Each block preserves the test conditions and published values from one reference. Values from different sources are intentionally kept separate.
Data set 01
Published operating points and test conditions from this source.
Heater voltage
6.3 V
Published nominal value
Heater current
450 mA
Published nominal value
Transconductance
1500 µS
Published operating characteristic
HeaterVoltageNominal
6.3 V
Nominal
HeaterCurrentNominal
450 mA
Nominal
Maximum Plate Voltage
300 V
Maximum Plate Dissipation
1 W
Data set 02
Published operating points and test conditions from this source.
Maximum plate voltage
300 V
Published handbook rating
Plate voltage
250 V
ClassA
Control-grid bias
3 V
ClassA
Plate current
1 mA
ClassA
Plate resistance
58000 ohm
Published handbook characteristic
Transconductance
1200 µS
Published handbook characteristic
Amplification factor
70
Published handbook characteristic
Heater voltage
6.3 V
Published heater rating
Heater current
450 mA
Published heater rating
Input capacitance
1.9 pF
Published capacitance column
Output capacitance
1.6 pF
Published capacitance column
Grid-to-plate capacitance
2.2 pF
Published capacitance column
Data set 03
Published operating points and test conditions from this source.
Diode impedance
5000 Ohm
Diode1;Vad=10V
Plate voltage
100 V
Point1
Control-grid voltage
-1 V
Point1
Plate current
0.8 mA
Point1
Transconductance
1450 uS
Point1
Amplification factor
70 ratio
Point1
Plate resistance
48000 Ohm
Point1
Plate voltage
250 V
Point2
Control-grid voltage
-3 V
Point2
Plate current
1 mA
Point2
Transconductance
1400 uS
Point2
Amplification factor
70 ratio
Point2
Plate resistance
50000 Ohm
Point2
Input capacitance
1.9 pF
TriodeSection
Output capacitance
1.4 pF
TriodeSection
Plate supply voltage
250 V
AFAmplifier
Plate load resistance
220 kOhm
AFAmplifier
Plate current
0.8 mA
AFAmplifier
Stage gain
55 ratio
AFAmplifier
Diode impedance
200 Ohm
Diode2;Vad=5V
Diode impedance
200 Ohm
Diode3;Vad=5V
Data set 04
Published operating points and test conditions from this source.
Application
DetectorRectifier text
Application
AFVoltageAmplifier text
Data set 05
Published operating points and test conditions from this source.
Peak inverse voltage
350 V
Average diode current
1 mA
Peak diode current
6 mA
Diode capacitance
0.8 pF
Heater voltage
6.3 V
Heater current
450 mA
Triode plate-grid capacitance
2.2 pF
Triode input capacitance
1.9 pF
Peak inverse voltage
350 V
Average diode current
10 mA
Peak diode current
75 mA
Diode capacitance
8.7 pF