Rectifier - Half Wave ·Rectifier
3B27
Electronic Enterprises 3B27 indirectly heated high-vacuum half-wave rectifier with 2.5 V 5 A heater, 60-second warm-up and up to 8500 V peak inverse voltage under specified current limits.
- Sections
- 1
- Base
- -
- Socket code
- -
- Base pins
- 4
- Nominal heater
- 2.5 V / 5 A
General specifications
Tube and section characteristics
Properties common to every published source and operating point.
Heater and base
- Base
- -
- Socket code
- -
- Base pins
- 4
- Nominal heater voltage
- 2.5 V
- Nominal heater current
- 5 A
- 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
Rectifier
- Rectifier peak inverse voltage
- 8500 V
- Rectifier nominal output current
- 150 mA
- Rectifier peak forward current
- 600 mA
- Rectifier forward voltage drop
- 35 V
- Rectifier warm-up time
- 60 s
RMA 1944 3B27 half-wave high-vacuum rectifier. Paired alternative maximum ratings: (I) PIV 8500 V, peak plate current 0.6 A, average output 150 mA; (II) PIV 7500 V, peak plate 0.8 A, average 200 mA; (III) PIV 6000 V, peak plate 1.0 A, average 250 mA. Promoted PIV/current fields correspond to Rating I only; do not combine maxima across rating sets. Forward voltage drop 35 V at 150 mA, 45 V at 200 mA, 55 V at 250 mA. Heater 2.5 V 5 A; wait 60 s before plate voltage. Indirectly heated oxide cathode, medium anode top cap.
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.