Data set 01
1938 Philips Miniwatt Vacuum Tube Catalog
Published operating points and test conditions from this source.
SECTION 1
Pentode
Characteristics
Grid/anode capacitance
0.003 pF
Voltage Pentode - High Frequency (single) ·Pentode
AF7
European high-frequency pentode for RF, IF, and audio-frequency voltage amplification, combining broad utility with very high plate resistance.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 1
- Base
- P30
- Socket code
- P8A
- Base pins
- 8
- Nominal heater
- 4 V / 650 mA
Description
Telefunken high-frequency pentode for RF, IF, and audio amplification, with 4 V heater and high internal resistance.
Socket description
European 8-pin side-contact base
General specifications
Tube and section characteristics
Properties common to every published source and operating point.
Heater and base
- Base
- P30
- Socket code
- P8A
- Base pins
- 8
- Nominal heater voltage
- 4 V
- Nominal heater current
- 650 mA
- Parallel heater voltage
- -
- Parallel heater current
- -
- Series capable
- No
P30 - Terminal pinout
Electrical assignments shared by every tube using this base designation.
No verified pinout is recorded for this base designation.
Section ratings
1 physical section, each with unique specifications.
Section 1
Pentode
X-ray radiationInterelectrode capacitances
- Plate resistance
- 2900000 Ω
- Transconductance
- 0.0021 S
- Max plate voltage
- 250 V
- Max screen voltage
- 125 V
- Max plate dissipation
- 1 W
- Max screen dissipation
- 0.3 W
- Max cathode current
- 6 mA
Straight-characteristic RF pentode; promoted values from published nominal operating point.
Source-dependent data
Operating conditions by source
Each block preserves the test conditions and published values from one reference. Values from different sources are intentionally kept separate.
Data set 02
1953 RFT Rundfunk Technik
Published operating points and test conditions from this source.
SECTION 1
Pentode
Characteristics
Heater or filament voltage
4 V
Published nominal value
Heater or filament current
650 mA
Published nominal value
Transconductance
2100 µS
Published operating characteristic
Data set 03
195X Tunsgram
Published operating points and test conditions from this source.
SECTION 1
Pentode
Other
Typical plate voltage
250 V
Typical screen voltage
100 V
Typical plate current
3 mA
Maximum no-current anode voltage
550 V
Maximum heater-cathode voltage
50 V
Characteristic
Maximum transconductance
0.0024 A/V
Data set 04
1999 Philips 0-D
Published operating points and test conditions from this source.
SECTION 1
Pentode
Characteristics
Heater voltage
4 V
Heater current
650 mA
Plate voltage
250 V
Screen/auxiliary voltage
100 V
Plate current
3 mA
Screen/auxiliary current
1.1 mA
Transconductance
2100 uS
Plate resistance
2000000 ohm
Capacitance
Input capacitance
6.4 pF
Output capacitance
7.6 pF
Plate-grid capacitance maximum
0.003 pF