13D8

Brimar 13D8 low-mu, balanced dual audio-frequency triode, electrically similar to 12AU7, with 6.3 V parallel or 12.6 V series heater.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 2
Base: B9A
Socket code: -
Base pins: 9
Nominal heater: 6.3 V / 300 mA

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: B9A
Socket code: -
Base pins: 9
Nominal heater voltage: 6.3 V
Nominal heater current: 300 mA
Parallel heater voltage: 6.3 V
Parallel heater current: 300 mA
Series capable: Yes

B9A - Terminal pinout

Electrical assignments shared by every tube using this base designation.

No verified pinout is recorded for this base designation.

Section ratings

2 physical sections, each with unique specifications.

Section 1

Triode

X-ray radiationInterelectrode capacitances

Plate resistance: 7700 Ω
Transconductance: 0.0022 S
Amplification factor: 17
Max plate voltage: 300 V
Max plate dissipation: 2.75 W
Max cathode current: 20 mA

Brimar March 1966. Each section: maximum anode supply 550 V; maximum heater-cathode 100 V DC and 200 V peak. Typical Va 250 V, Vg -8.5 V, Ia 10.5 mA. Input capacitance 1.6 pF; output capacitance 0.5 pF; grid-anode capacitance 1.5 pF (without external shield).

Section 2

Triode

X-ray radiationInterelectrode capacitances

Plate resistance: 7700 Ω
Transconductance: 0.0022 S
Amplification factor: 17
Max plate voltage: 300 V
Max plate dissipation: 2.75 W
Max cathode current: 20 mA

Brimar March 1966. Each section: maximum anode supply 550 V; maximum heater-cathode 100 V DC and 200 V peak. Typical Va 250 V, Vg -8.5 V, Ia 10.5 mA. Input capacitance 1.6 pF; output capacitance 0.35 pF; grid-anode capacitance 1.5 pF (without external shield).

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 01

9999 Mixed 2000

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

Plate voltage
250 V
Typical Va; Vg=-8.5 V; heater 12.6 V series
Control-grid voltage
-8.5 V
Typical Va=250 V
Plate current
10.5 mA
Typical Va=250 V, Vg=-8.5 V

Characteristic

Plate resistance
7700 Ω
Typical Va=250 V
Transconductance
2200 µS
Typical Va=250 V
Plate Resistance
7700 Ω
Typical Va=250 V

SECTION 2

Triode

Other

Plate voltage
250 V
Typical Va; Vg=-8.5 V; heater 12.6 V series
Control-grid voltage
-8.5 V
Typical Va=250 V
Plate current
10.5 mA
Typical Va=250 V, Vg=-8.5 V

Characteristic

Plate resistance
7700 Ω
Typical Va=250 V
Transconductance
2200 µS
Typical Va=250 V
Plate Resistance
7700 Ω
Typical Va=250 V