Voltage Pentode - Sharp Cutoff (single) ·Pentode
Very-high-transconductance sharp-cutoff miniature pentode designed for voltage-amplifier service. Its high slope provides substantial fixed gain for demanding high-frequency and broadband signal stages.
Very-high-transconductance sharp-cutoff miniature pentode for voltage-amplifier service.
Miniature 7-contact
General specifications
Properties common to every published source and operating point.
Electrical assignments shared by every tube using this base designation.
No verified pinout is recorded for this base designation.
1 physical section, each with unique specifications.
Section 1
6AH6 indirectly heated high-transconductance sharp-cutoff seven-pin miniature pentode for wideband video, RF and IF amplification or reactance-tube service. Heater 6.3 V 0.45 A. GE, Tung-Sol and Sylvania report design-center maximum plate 300 V, plate dissipation 3.2 W, screen dissipation 0.4 W and cathode current 13 mA. Existing 150 V max_screen_voltage retained; manufacturers also specify a conditional grid-2 screen-supply maximum of 300 V with actual screen voltage subject to a rating chart, not an unrestricted electrode limit. Pentode-connected at plate 300 V, screen 150 V, cathode resistor 160 Ω, plate current 10 mA, screen current 2.5 mA: GE gives gm ~8000 µmhos (0.008 S), Sylvania and other editions ~9000 µmhos (0.009 S), approximate plate resistance 500 kΩ; existing 0.008 S retained due to source variation. Triode connection (grids 2 and 3 tied to plate) at plate 150 V: typical gm 11000 µmhos, amplification factor ~40, plate resistance ~3600 Ω; this is an alternative connection, NOT an additional physical section. Grid-3-to-plate gm only ~2 µmhos and not an ordinary independent signal control. Shielded interelectrode capacitances grid-to-plate max 0.020 pF, input 10 pF, output 3.6 pF.
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 or filament voltage
6.3 V
Published nominal or representative value
Heater or filament current
450 mA
Published nominal or representative value
Transconductance
9000 µS
Published operating characteristic
Maximum plate dissipation
3.2 W
Published maximum rating
Data set 02
Published operating points and test conditions from this source.
Plate voltage
300 V
ClassA;PentodeConnection
Screen-grid voltage
150 V
ClassA;PentodeConnection
Cathode resistor
160 ohm
ClassA;PentodeConnection
Plate current
10 mA
ClassA;PentodeConnection
Screen-grid current
2.5 mA
ClassA;PentodeConnection
Plate voltage
150 V
ClassA;TriodeConnection
Cathode resistor
160 ohm
ClassA;TriodeConnection
Plate current
12.5 mA
ClassA;TriodeConnection
Plate resistance
3600 ohm
ClassA;TriodeConnection
Transconductance
11000 uS
ClassA;TriodeConnection
Amplification factor
40
ClassA;TriodeConnection
Data set 03
Published operating points and test conditions from this source.
Plate voltage
300 V
PentodeConnection
Plate current
10 mA
PentodeConnection
Screen current
2.5 mA
PentodeConnection
Plate voltage
150 V
TriodeConnection
Plate current
12.5 mA
TriodeConnection
Application
Very-high-transconductance sharp-cutoff voltage amplifier
Section1
Transconductance
9000 µS
PentodeConnection
Plate resistance
3600 Ω
TriodeConnection
Transconductance
11000 µS
TriodeConnection
Amplification factor
40
TriodeConnection
Data set 04
Published operating points and test conditions from this source.
HeaterOrFilamentVoltageNominal
6.3 V
HeaterOrFilamentCurrentNominal
450 mA
Maximum Plate Voltage
300 V
Maximum Screen Voltage
150 V
Maximum Plate Dissipation
3.2 W
Maximum Screen Dissipation
0.4 W
Maximum Cathode Current
13 mA
Plate Resistance
500000 Ohm
Transconductance
8000 uS
Data set 05
Published operating points and test conditions from this source.
Application
RF_IF_Amplifier text