Voltage Pentode - Sharp Cutoff (single) ·Pentode
Sharp-cutoff lock-in pentode designed specifically for gated-amplifier service, with suppressor-grid control for electronic gating.
The 7AK7 is a sharp-cutoff lock-in pentode specifically designed and rated for gating service, with an additional control voltage applied to the suppressor grid.
Loctal 8-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 |
|---|---|---|---|
| PIN1H | — | H — Heater EIA source transcription; manufacturer confirmation pending | Unverified EIA Base Connections, printed page 129, 8V |
| PIN2P | A | P — Plate (Anode) EIA source transcription; manufacturer confirmation pending | Unverified EIA Base Connections, printed page 129, 8V |
| PIN3G2 | A | G2 — Screen Grid EIA source transcription; manufacturer confirmation pending | Unverified EIA Base Connections, printed page 129, 8V |
| PIN4G3 | A | G3 — Suppressor Grid EIA source transcription; manufacturer confirmation pending | Unverified EIA Base Connections, printed page 129, 8V |
| PIN5IS | A | IS — Internal Screen EIA chart transcription; manufacturer verification pending | Unverified EIA Base Connections, printed page 129, 8V |
| PIN6G1 | A | G1 — Control Grid EIA chart transcription; manufacturer verification pending | Unverified EIA Base Connections, printed page 129, 8V |
| PIN7K | A | K — Cathode EIA chart transcription; manufacturer verification pending | Unverified EIA Base Connections, printed page 129, 8V |
| PIN8H | — | H — Heater EIA chart transcription; manufacturer verification pending | Unverified EIA Base Connections, printed page 129, 8V |
1 physical section, each with unique specifications.
Section 1
Promoted from printed maximum/characteristic columns; additional published values are retained in TUBE_SECTION_PARAMETER.
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.
Input capacitance
2 pF
Section1
Output capacitance
9.5 pF
Section1
Grid-to-plate capacitance
0.7 pF
Section1
Typical plate voltage
150 V
ClassA;Grid3=0V
Typical screen voltage
90 V
ClassA;Grid3=0V
Typical plate current
21 mA
ClassA;Grid3=0V
Plate resistance
11500 Ohm
Grid3=0V
Transconductance
6000 uS
Grid3=0V
Data set 02
Published operating points and test conditions from this source.
Plate voltage
150 V
MixerGatedAmplifier
Control-grid voltage
0 V
MixerGatedAmplifier
Screen voltage
90 V
MixerGatedAmplifier
Suppressor-grid voltage
0 V
MixerGatedAmplifier
Plate current
40 mA
MixerGatedAmplifier
Screen current
21 mA
MixerGatedAmplifier
Plate resistance
11500 Ω
Section1
Transconductance
6500 µS
Section1
Data set 03
Published operating points and test conditions from this source.
Heater voltage
6.3 V
Nominal
Heater current
800 mA
Nominal
Plate voltage
150150150 V
Typical operating conditions
Screen voltage
100 V
Typical operating conditions
Data set 04
Published operating points and test conditions from this source.
Maximum_heater_cathode_voltage
90 V
Maximum_positive_grid_1_voltage
50 V
Maximum_positive_grid_3_voltage
200 V
Maximum_negative_grid_1_voltage
-100 V
Maximum_negative_grid_3_voltage
-200 V
Plate_voltage
150 V
ClassA
Screen_voltage
90 V
ClassA
Grid_1_voltage
0 V
ClassA
Grid_3_voltage
0 V
ClassA
Plate_current
40 mA
ClassA
Screen_current
21 mA
ClassA
Grid-to-plate capacitance
0.7 pF
Input capacitance
12 pF
Output capacitance
9.5 pF
Suppressor-grid-to-plate capacitance
4 pF