TKBC1

Low-voltage double-diode triode for battery-operated receiver signal processing. Two diodes provide detector and control-voltage rectification while the triode supplies a separate low-level amplifier stage.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 3
Base: -
Socket code: -
Base pins: -
Nominal heater: 2 V / 100 mA

Description

Battery double-diode triode combining detector diodes with a triode amplifier section for portable radio receivers.

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: -
Base pins: -
Nominal heater voltage: 2 V
Nominal heater current: 100 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

X-ray radiationInterelectrode capacitances

Max cathode current: 0.2 mA

Tungsram TKBC1 first physical detector diode, connected at pin 7, adjacent to the negative filament terminal at pin 3. Manufacturer specifies diode current limit 0.2 mA and peak inverse voltage 125 V. Separate physical diode sections are retained; do not interpret peak reverse voltage as continuous positive anode rating.

Section 2

Diode

X-ray radiationInterelectrode capacitances

Max cathode current: 0.2 mA

Tungsram TKBC1 second physical detector diode, connected at pin 8, adjacent to the other filament terminal at pin 2. Manufacturer specifies diode current limit 0.2 mA and peak inverse voltage 125 V. This diode may be used for detector or AVC rectification independently of the first diode.

Section 3

Triode

X-ray radiationInterelectrode capacitances

Plate resistance: 16000 Ω
Transconductance: 0.001 S

Tungsram TKBC1 directly heated battery double-diode triode, 2 V filament at 0.1 A. Triode typical characteristics at 90 V anode: transconductance 0.7 mA/V and plate resistance 23 kΩ; at 135 V: transconductance 1.0 mA/V and plate resistance 16 kΩ. Promoted values use the 135 V operating point, not universal maxima; two distinct physical diode detector sections are also present.

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

195X Tunsgram

Published operating points and test conditions from this source.

SECTION 1

Diode

Characteristics

Heater or filament voltage
2 V
Published nominal value
Heater or filament current
100 mA
Published nominal value

SECTION 3

Triode

Characteristics

Heater or filament voltage
2 V
Published nominal value
Heater or filament current
100 mA
Published nominal value