7227

Power/output pentode designed for low-frequency or audio-frequency output amplification.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: B9A
Base pins: 9
Nominal heater: 27.5 V / 175 mA

Description

TYPE 7227: ILOW VOLTAGE OUTPUT PRNTODE. The 7227 is an indirectly heated pentode for power output operation, It is designed for reliable service in mobile or fixed equipment where will operate in applications where the heater, plate and screen voltages are derived from a battery of approximetely 2L¥. These features make the tube particularly suitable for use in the instrumentation, control and radio eaguinment of aircrafd, Cozted uninotential cathode Base. seseccccvo nsses BI=1 Miniature Glass Button 9 pin. Maxlfﬁlm dlalleter ......l..l.....O...l...l...........’...l'...... MaXimum Overall length PR I ROSOINAPIINCINBIPNIGIOIBEIRNRLOIRODROIIOIDPOTITTS Maximuln Seated height e9S VO PESARSSLOIGOIOCENRIGSAESPIOROREECEDPSILILALQROIOGIOERRTITSODS 2

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: 27.5 V
Nominal heater current: 175 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

Max plate dissipation: 2 W

Primary electrical section; identical repeated sections compressed where applicable.

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

1954 STC Brimar

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Maximum platc diSSipation veeseesccescescsesassssccccsssessress 2 Watts
2 W
Maximum platc diSSipation veeseesccescescsesassssccccsssessress 2 Watts

Characteristic

M&Ximum grid N0.1 current e S 0 I PP 60800803000 06800Roecsossessseos 5 mA
5 mA
M&Ximum grid N0.1 current e S 0 I PP 60800803000 06800Roecsossessseos 5 mA
Grid No.3 voltage «.e....Pin No,9 connected to pin No.3 at socket
3 V
Grid No.3 voltage «.e....Pin No,9 connected to pin No.3 at socket
Grid No.1 VOlta.ge IR R e e P R NN RS A "205D¢C°VO11':":
1 V
Grid No.1 VOlta.ge IR R e e P R NN RS A "205D¢C°VO11':":
Grid NOe2 CUIYTENT ssoesesacvesestaccessosvnsososncescassccsassads 1.1mA
1.1 mA
Grid NOe2 CUIYTENT ssoesesacvesestaccessosvnsososncescassccsassads 1.1mA
Grid No.1 Voltage (apnrox.) for Ib'—'10uA,--..-.-..--.ao-o-ocan.a "705 volts
705 V
Grid No.1 Voltage (apnrox.) for Ib'—'10uA,--..-.-..--.ao-o-ocan.a "705 volts