Voltage Pentode or Tetrode (with diode) ·Diode-Diode-Pentode
8ET7
Series-heater diode-pentode for television IF amplification and video detection, integrating a high-transconductance pentode with a separate detector diode.
- Sections
- 3
- Base
- -
- Socket code
- B9A
- Base pins
- 9
- Nominal heater
- 8 V / 450 mA
Description
Dual-diode sharp-cutoff pentode for combined video amplification and horizontal phase detection in television receivers. The supplied Tung-Sol datasheet was used for construction, heater, ratings, characteristics, and intended-service information.
Socket description
Small-button Noval 9-contact
General specifications
Tube and section characteristics
Properties common to every published source and operating point.
Heater and base
- Base
- -
- Socket code
- B9A
- Base pins
- 9
- Nominal heater voltage
- 8 V
- Nominal heater current
- 450 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
3 physical sections, each with unique specifications.
Section 1
Diode
- Rectifier max heater-cathode voltage
- 200 V
- Rectifier warm-up time
- 11 s
Published promoted fields populated semantically; identical repeated sections compressed.
Section 2
Pentode
- Transconductance
- 0.009 S
- Max plate voltage
- 300 V
- Rectifier max heater-cathode voltage
- 200 V
- Rectifier warm-up time
- 11 s
Published promoted fields populated semantically; identical repeated sections compressed.
Section 3
Diode
No fixed ratings are recorded for this section.
Physical diode section added during approved section-structure reconciliation.
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.