YD1252

Vapor-cooled power triode with coaxial grid connection, particularly suited to low-grid-current modulator service in transmitters up to about 600 kW. Rated for approximately 180 kW plate dissipation and 12 kV plate voltage.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: 17 V / 265 A

Description

Vapor-cooled triode with coaxial grid lead-through, particularly suitable for modulator operation at low grid current in transmitters up to 600 kW. Emission current at UA = UG = 650 V I em 160 A Amplification factor at UA = 4 to 10 kV, I A = 5 A µ 15

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: 17 V
Nominal heater current: 265 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

Transconductance: 0.105 S
Amplification factor: 15
Max plate voltage: 12000 V
Max plate dissipation: 180000 W
Max grid dissipation: 2500 W
Max cathode current: 40 A

Maximum ratings promoted from published rating tables; additional condition-specific values preserved in parameters.

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

1963 Siemens

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristics

Amplification factor
15
Transconductance
105000 µS
Emission current at UA = UG = 650 V
160 A V
Amplification factor at UA = 4
10 kV, I A = 5 A µ 15 kV
Transconductance at UA = 4 kV, IA = 5 A
105 mA/V kV

Other

Heater voltage
17 V V
Heater current
≈ 265 A A
Anode voltage (dc)
12 kV kV
Grid voltage (dc)
– 1500 V V
Cathode current (dc)
40 A A
Peak cathode current
160 A A
Anode dissipation
180 kW kW
Grid dissipation
2,5 kW kW
600
500 kW kW
Output power
420 0 350 kW kW
Anode voltage (dc)
11 11 11 11 kV kV
Grid voltage (dc)
– 720 – 720 – 740 – 740 V V
Peak control grid voltage (ac)
2200 0 2100 V V
between
2 tubes
Anode current (dc)
2×3 2 × 31,4 2 × 2 2 × 26 A A
Grid current (dc)
2 × 1,1 0 2 × 0,9 A A
Peak grid current
2×8 0 2×7 A A
Anode input power
2 × 33 2 × 345 2 × 22 2 × 286 kW A
Drive power
2 × 1050 0 2 × 850 W W
Anode dissipation
2 × 33 2 × 135 2 × 22 2 × 111 kW kW
Grid dissipation
2 × 280 0 2 × 180 W W
Efficiency η —
61 — 61 %
Effective load resistance (anode to anode) RAA —
350 — 420 Ω Ω
Modulator Triode
2051 V V

Capacitance

Cathode/grid
≈ 260 pF pF
Cathode/anode
≈ 14 pF 1) pF
Grid/anode
≈ 140 pF pF
Modulator Triode
2051 V V

Cooling

(PA + PG + 0,8 PF )
188 kW PF
Equivalent thermal
11300 kJ/min (2700 kcal/min)
at returning water temperature
20 °C approx. 4,4 l/min l/min
at returning water temperature
90 °C approx. 5,1 l/min l/min
at returning water temperature
20 °C approx. 7,3 m 3/min
at returning water temperature
90 °C approx. 8,3 m 3/min
Modulator Triode
2051 V V