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RK52

High-mu directly heated Raytheon power triode for Class C RF amplification, Class B audio power, oscillation, and frequency multiplication. Moderate dissipation and 1.5 kV capability provide versatile transmitter service.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: UX4
Base pins: -
Nominal heater: 7.5 V / 3.75 A

Description

High-mu directly heated triode power amplifier for RF Class C service, audio-frequency Class B power amplification, oscillator service, and frequency multiplication.

Socket description

Medium-shell UX 4-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: UX4
Base pins: -
Nominal heater voltage: 7.5 V
Nominal heater current: 3.75 A
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

Triode

X-ray radiationInterelectrode capacitances

Max plate voltage: 1500 V
Max plate dissipation: 62.5 W
Max cathode current: 150 mA

Published ratings/characteristics promoted where directly applicable; identical twin sections are compressed to one section row.

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

1938 Raytheon

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristics

Heater or filament voltage
7.5 V
Published nominal value
Heater or filament current
3.75 A
Published nominal value

Capacitance

Grid-to-plate capacitance
12 pF
Published direct interelectrode capacitance
Input capacitance
6.6 pF
Published direct interelectrode capacitance
Output capacitance
2.2 pF
Published direct interelectrode capacitance

Other

Maximum plate voltage
1250 V
ClassB; TwoTubes
Maximum plate current per tube
150 mA
ClassB; TwoTubes
Maximum plate dissipation per tube
62.5 W
ClassB; TwoTubes
Plate voltage
1250 V
ClassB; TwoTubes
Grid voltage
0 V
ClassB; TwoTubes
No-signal plate current
40 mA
ClassB; TwoTubes
Maximum-signal plate current
300 mA
ClassB; TwoTubes
Maximum-signal grid current
100 mA
ClassB; TwoTubes
Peak AF grid voltage
180 V
ClassB; TwoTubes
AF driving power
7.5 W
ClassB; TwoTubes
Plate-to-plate load resistance
10000 ohm
ClassB; TwoTubes
Audio power output
250 W
ClassB; TwoTubes
Maximum plate voltage
1500 V
ClassC; Telegraphy
Maximum plate current
130 mA
ClassC; Telegraphy
Maximum grid current
50 mA
ClassC; Telegraphy
Maximum plate dissipation
60 W
ClassC; Telegraphy
RF power output
135 W
ClassC; Telegraphy; Va=1500V
Maximum plate voltage
1250 V
ClassC; Telephony; PlateModulation
Maximum plate current
115 mA
ClassC; Telephony; PlateModulation
Maximum grid current
50 mA
ClassC; Telephony; PlateModulation
Maximum plate dissipation
40 W
ClassC; Telephony; PlateModulation
Carrier power output
105 W
ClassC; Telephony; PlateModulation; Va=1250V
Peak power output
420 W
ClassC; Telephony; PlateModulation; Va=1250V
Maximum frequency at maximum ratings
60 MHz
Published operating note

Data set 02

1938 Raytheon Amateur

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristics

Heater or filament voltage
7.5 V
Published nominal value
Heater or filament current
3.75 A
Published nominal value

Other

Maximum plate dissipation
62.5 W
Published maximum or highest stated rating
RF power output
135 W
ClassC; Telegraphy
Audio power output
250 W
ClassB; TwoTubes
Maximum operating frequency
60 MHz
Full ratings