7803

High-frequency twin triode designed for continuous Class-C RF amplifier and frequency-multiplier service, including doubler operation around 175 MHz with useful RF power output.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 2
Base: 9A
Socket code: B9A
Base pins: 9
Nominal heater: 6.3 V / 365 mA

Description

High-frequency twin triode for continuous Class-C amplifier and RF frequency-multiplier service.

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: 9A
Socket code: B9A
Base pins: 9
Nominal heater voltage: 6.3 V
Nominal heater current: 365 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

9A - Terminal pinout

Electrical assignments shared by every tube using this base designation.

Terminal	Section	Connection	Evidence
PIN12P	B	P — Plate (Anode) EIA transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 130, 9A
PIN22G1	B	G1 — Control Grid EIA transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 130, 9A
PIN32K	B	K — Cathode EIA transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 130, 9A
PIN4H	—	H — Heater EIA transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 130, 9A
PIN5H	—	H — Heater EIA transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 130, 9A
PIN61P	A	P — Plate (Anode) EIA transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 130, 9A
PIN71G1	A	G1 — Control Grid EIA transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 130, 9A
PIN81K	A	K — Cathode EIA transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 130, 9A
PIN9HCT	—	HCT — Heater Center Tap EIA transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 130, 9A

Section ratings

2 physical sections, each with unique specifications.

Section 1

Triode

X-ray radiationInterelectrode capacitances

Transconductance: 0.0125 S
Amplification factor: 33
Max plate voltage: 200 V
Max plate dissipation: 3.5 W
Max cathode current: 30 mA

Published ratings and characteristics promoted from the supplied datasheet where legible.

Section 2

Triode

X-ray radiationInterelectrode capacitances

Transconductance: 0.0125 S
Amplification factor: 33
Max plate voltage: 200 V
Max plate dissipation: 3.5 W
Max cathode current: 30 mA

Second physical triode restored under current one-row-per-physical-section policy.

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

1950 Sylvania

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

Heater Voltage
6.3 V
Nominal published value

Data set 02

1965 Sylvania Electronic Tubes Vol3

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristics

Heater voltage
6.3 V
Heater current
365 mA
Transconductance
12500 uS
Amplification factor
33

Other

Heater voltage minimum
5.7 V
Heater voltage maximum
6.9 V
Heater-cathode voltage maximum heater negative
200 V
Heater-cathode voltage maximum heater positive DC
100 V
Plate voltage maximum
200 V
ClassC
Plate dissipation maximum per section
3.5 W
ClassC
Plate dissipation maximum total
7 W
ClassC
Cathode current maximum per section
30 mA
ClassC
Grid current maximum per section
2.5 mA
ClassC
Negative grid voltage maximum
-75 V
Typical plate voltage
90 V
Typical grid voltage
-1.3 V
Typical plate current per section
15 mA
RF doubler frequency maximum
175 MHz
ClassC
RF doubler plate voltage
160 V
ClassC
RF doubler grid voltage
-70 V
ClassC
RF doubler grid resistor
33000 ohm
ClassC
RF doubler peak RF grid voltage
77 V
ClassC
RF doubler grid current
2.5 mA
ClassC
RF doubler plate current
26 mA
ClassC
RF doubler output power
1 W
ClassC

Capacitance

Grid-to-plate capacitance per section
1.4 pF
Input capacitance per section
3.3 pF
Output capacitance per section
2.5 pF
Inter-section plate-to-plate capacitance maximum
0.015 pF

Application

Application
RF amplifier / frequency multiplier