Data set 01
195X Tesla
Published operating points and test conditions from this source.
SECTION 1
Beam Power
Other
Plate voltage
250 V
Screen voltage
250 V
Plate dissipation
12 W
Power - Beam (NOT sweep) ·BeamPower
6L31
Beam-power audio-output tube for single-ended Class A and push-pull Class AB amplification, providing medium-power service in radio and audio equipment.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 1
- Base
- 7BZ
- Socket code
- B7G
- Base pins
- 7
- Nominal heater
- 6.3 V / 450 mA
Description
Beam-power output tube for Class A and push-pull Class AB audio power amplification; source also designates 6L31.
Socket description
Miniature 7-contact
General specifications
Tube and section characteristics
Properties common to every published source and operating point.
Heater and base
- Base
- 7BZ
- Socket code
- B7G
- Base pins
- 7
- Nominal heater voltage
- 6.3 V
- Nominal heater current
- 450 mA
- Parallel heater voltage
- -
- Parallel heater current
- -
- Series capable
- No
7BZ - Terminal pinout
Electrical assignments shared by every tube using this base designation.
| Terminal | Section | Connection | Evidence |
|---|---|---|---|
| PIN1Pin 1 | A | G1 — Control Grid | Verified Tung-Sol 6AQ5/6AQ5A 7BZ basing; manufacturer pinout |
| PIN2Pin 2 | A | G3 — Suppressor GridGroup BZ2 | Verified Tung-Sol 6AQ5/6AQ5A 7BZ basing; manufacturer pinout |
| PIN2Pin 2 | A | K — CathodeGroup BZ2 | Verified Tung-Sol 6AQ5/6AQ5A 7BZ basing; manufacturer pinout |
| PIN3Pin 3 | — | H — Heater | Verified Tung-Sol 6AQ5/6AQ5A 7BZ basing; manufacturer pinout |
| PIN4Pin 4 | — | H — Heater | Verified Tung-Sol 6AQ5/6AQ5A 7BZ basing; manufacturer pinout |
| PIN5Pin 5 | A | P — Plate (Anode) | Verified Tung-Sol 6AQ5/6AQ5A 7BZ basing; manufacturer pinout |
| PIN6Pin 6 | A | G2 — Screen Grid | Verified Tung-Sol 6AQ5/6AQ5A 7BZ basing; manufacturer pinout |
| PIN7Pin 7 | A | G1 — Control Grid | Verified Tung-Sol 6AQ5/6AQ5A 7BZ basing; manufacturer pinout |
Section ratings
1 physical section, each with unique specifications.
Section 1
Beam Power
X-ray radiationInterelectrode capacitances
- Transconductance
- 0.0041 S
- Max plate voltage
- 250 V
- Max screen voltage
- 250 V
- Max plate dissipation
- 12 W
- Max screen dissipation
- 2 W
Electrical section mapped from published characteristics and maximum ratings.
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
1969 Tesla Manual of Electronic Tubes
Published operating points and test conditions from this source.
SECTION 1
Beam Power
Characteristics
Heater voltage
6.3 V
Published nominal value
Heater current
450 mA
Published nominal value
Transconductance
4500 µS
Published operating characteristic
Other
Maximum plate dissipation
12 W
Published maximum rating
Application
AF power amplifier
Class A