Data set 01
1948 Brimar Radio Valve Manual
Published operating points and test conditions from this source.
SECTION 1
Pentode
Characteristic
HeaterOrFilamentVoltage
2 V
HeaterOrFilamentCurrent
60 mA
Voltage Pentode - Remote Cutoff (single) ·Pentode
34E
Directly heated battery RF pentode designed for radio-frequency amplification in portable receiving equipment.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 1
- Base
- -
- Socket code
- IO
- Base pins
- 7
- Nominal heater
- 2 V / 60 mA
Description
Directly heated RF pentode.
Socket description
International Octal
General specifications
Tube and section characteristics
Properties common to every published source and operating point.
Heater and base
- Base
- -
- Socket code
- IO
- Base pins
- 7
- Nominal heater voltage
- 2 V
- Nominal heater current
- 60 mA
- Parallel heater voltage
- -
- Parallel heater current
- -
- Series capable
- No
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
- 600000 Ω
- Transconductance
- 0.0006 S
- Max plate voltage
- 180 V
- Max screen voltage
- 67.5 V
Brimar 1948 identifies 34E as a directly heated battery vari-mu (remote-cutoff) RF pentode with 2.0 V, 0.06 A filament. At Va 67.5 V, Vg2 67.5 V, Vg1 -3 V: Ia 2.7 mA, Ig2 1.1 mA, rp approximately 400 kΩ and gm 0.56 mA/V. At Va 135 V, Vg2 67.5 V, Vg1 -3 V: Ia 2.8 mA, Ig2 1.0 mA, rp approximately 600 kΩ and gm 0.60 mA/V; the latter operating point supplies promoted gm and rp. Control-grid bias -22.5 V reduces gm to 0.015 mA/V, demonstrating variable-mu action. Brimar labels base U.X., while current parent indicates 7-pin IO; preserve existing base fields pending independent confirmation. Brimar table provides operating characteristics, not explicitly absolute voltage maximums, so existing voltage limits retained.
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.