6F15

Mazda 6F15 variable-µ RF pentode for gain-controlled receiving amplifiers, with high anode impedance, 6.3 V 0.2 A heater and eight-contact B8A-style base.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: 8
Nominal heater: 6.3 V / 200 mA

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: -
Base pins: 8
Nominal heater voltage: 6.3 V
Nominal heater current: 200 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

1 physical section, each with unique specifications.

Section 1

Pentode

X-ray radiationInterelectrode capacitances

Plate resistance: 1700000 Ω
Transconductance: 0.0023 S
Max plate voltage: 250 V
Max screen voltage: 250 V
Max cathode current: 10 mA

Mazda 6F15 VARI-MU/remote-cutoff RF pentode, eight-contact B8A-style base, indirectly heated 6.3 V 0.2 A. Manufacturer plate and screen maximum each 250 V, cathode current max 10 mA. Typical at plate 250 V, screen 100 V, grid-1 -2.5 V: gm 2.3 mA/V (0.0023 S), plate resistance 1.7 MΩ, inner grid1-to-screen amplification factor 16.5, plate current ~7 mA, screen current ~2 mA. Published capacitances output ~6.8 pF, input ~5.1 pF, anode-to-control-grid ~0.0034 pF (fixture-dependent). Capacitance flag true. Pin 3 internal shield and pin 4 suppressor should be joined and earthed. Remote-cutoff characteristic specifically supports AGC amplification.

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

1960 Mazda

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Plate Voltage
250 V
Screen Voltage
100 V
Grid Voltage
-2.5 V
Plate Current
7 mA
Screen Current
2 mA