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75TL

Eimac low-mu transmitting triode for RF amplifier, oscillator, and audio modulator service. Its low-mu characteristics favor heavier grid drive and high-current operation in moderate-power professional transmitter stages.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: 5 V / 6.25 A

Description

Low-mu transmitting triode for RF amplifier, oscillator, and audio modulator service.

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: 5 V
Nominal heater current: 6.25 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: 0.00335 S
Amplification factor: 2
Max plate voltage: 3000 V
Max plate dissipation: 75 W
Max grid dissipation: 13 W
Max cathode current: 225 mA

Promoted maximum ratings/characteristics populated from published headings; service-specific values retained 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

1950 Eimac Tubes

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristic

Filament Voltage
5 V
Filament Current
6.25 A
Amplification Factor
12
Transconductance
3350 uS

Capacitance

Grid-Plate Capacitance
2.4 pF
Grid-Filament Capacitance
2.6 pF
Plate-Filament Capacitance
0.4 pF

Other

Maximum DC Plate Voltage
3000 V
RF Class C and audio service
Maximum DC Plate Current
225 mA
RF Class C
Maximum Plate Dissipation
75 W
Maximum Grid Dissipation
13 W
Frequency Limit for Published RF Ratings
40 MHz
Typical RF Plate Output
225 W
Class C; 2 kV plate
Typical Audio Plate Output
350 W
Two tubes, Class B; 2 kV plate

Construction

Cooling
Radiation and air circulation

Data set 02

1962 Eimac

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

The Eimac
75
The Eimac 75TL is a low-mu, high-vacuum transmitting triode intended for amplifier, oscillator
and modulator service. It has a maximum plate dissipation rating of [1]
75 W
and modulator service. It has a maximum plate dissipation rating of 75 watts. Cooling of the 75TL is
and modulator service. It has a maximum plate dissipation rating of [2]
75 W
and modulator service. It has a maximum plate dissipation rating of 75 watts. Cooling of the 75TL is
Voltage
50 V
Voltage - - - - - - - - - - - 50 volts
Current
6.25 A
Current - - - - - - . - - - - 6.25 amperes
Amplification Factor (Average)
-2
Amplification Factor (Average)- - - - - - - - - -2
Transconductance (i, = [1]
225 uS
Transconductance (i, =225ma., E,=2500v., E,=-182v.) - 3350 umhos
Transconductance (i, = [2]
2500 uS
Transconductance (i, =225ma., E,=2500v., E,=-182v.) - 3350 umhos
Transconductance (i, = [3]
-182 uS
Transconductance (i, =225ma., E,=2500v., E,=-182v.) - 3350 umhos
Transconductance (i, = [4]
3350 uS
Transconductance (i, =225ma., E,=2500v., E,=-182v.) - 3350 umhos
D-C Plate Voltage [1]
1500 V
D-C Plate Voltage - - - - - - 1500 2000 volts
D-C Plate Voltage [2]
2000 V
D-C Plate Voltage - - - - - - 1500 2000 volts
MAXIMUM RATINGS (Frequencies below [1]
40 V
MAXIMUM RATINGS (Frequencies below 40 Mc.} D-C Grid Voltage! - - - - - -105 —160 volts
MAXIMUM RATINGS (Frequencies below [2]
-105 V
MAXIMUM RATINGS (Frequencies below 40 Mc.} D-C Grid Voltage! - - - - - -105 —160 volts
MAXIMUM RATINGS (Frequencies below [3]
-160 V
MAXIMUM RATINGS (Frequencies below 40 Mc.} D-C Grid Voltage! - - - - - -105 —160 volts
D-C PLATE VOLTAGE [1]
3000 V
D-C PLATE VOLTAGE - - - - - - 3000 MAX. YOLTS Peak A-F Grid Input VYoltage (per tube) - 105 160 volts
D-C PLATE VOLTAGE [2]
105 V
D-C PLATE VOLTAGE - - - - - - 3000 MAX. YOLTS Peak A-F Grid Input VYoltage (per tube) - 105 160 volts
D-C PLATE VOLTAGE [3]
160 V
D-C PLATE VOLTAGE - - - - - - 3000 MAX. YOLTS Peak A-F Grid Input VYoltage (per tube) - 105 160 volts
D-C PLATE CURRENT [1]
225 mA
D-C PLATE CURRENT - - - - - - - 225 MAX. MA. Zaro-Signal D-C Plate Current - - - - &7 50 ma.
D-C PLATE CURRENT [2]
7 mA
D-C PLATE CURRENT - - - - - - - 225 MAX. MA. Zaro-Signal D-C Plate Current - - - - &7 50 ma.
D-C PLATE CURRENT [3]
50 mA
D-C PLATE CURRENT - - - - - - - 225 MAX. MA. Zaro-Signal D-C Plate Current - - - - &7 50 ma.
PLATE DIiSSIPATION [1]
75 mA
PLATE DIiSSIPATION - - - - - - 75 MAX, WATTS Max-Signal D-C Plate Current - - - - 143 130 ma.
PLATE DIiSSIPATION [2]
143 mA
PLATE DIiSSIPATION - - - - - - 75 MAX, WATTS Max-Signal D-C Plate Current - - - - 143 130 ma.
PLATE DIiSSIPATION [3]
130 mA
PLATE DIiSSIPATION - - - - - - 75 MAX, WATTS Max-Signal D-C Plate Current - - - - 143 130 ma.
GRID DISSIPATION [1]
13 W
GRID DISSIPATION - - - - - - - 13 MAX. WATTS Driving Power - - - - - - 0 0 watt
GRID DISSIPATION [2]
0 W
GRID DISSIPATION - - - - - - - 13 MAX. WATTS Driving Power - - - - - - 0 0 watt
GRID DISSIPATION [3]
0 W
GRID DISSIPATION - - - - - - - 13 MAX. WATTS Driving Power - - - - - - 0 0 watt
TYPICAL OPERATION (Frequencies below [1]
40 W
TYPICAL OPERATION (Frequencies below 40 Mc.) Max-Signal Plate Power Output - - - 64 110 watts
TYPICAL OPERATION (Frequencies below [2]
64 W
TYPICAL OPERATION (Frequencies below 40 Mc.) Max-Signal Plate Power Output - - - 64 110 watts
TYPICAL OPERATION (Frequencies below [3]
110 W
TYPICAL OPERATION (Frequencies below 40 Mc.) Max-Signal Plate Power Output - - - 64 110 watts
Max-Signal Plate Dissipation (per tube) [1]
75 W
Max-Signal Plate Dissipation (per tube) - - 75 75 watts
Max-Signal Plate Dissipation (per tube) [2]
75 W
Max-Signal Plate Dissipation (per tube) - - 75 75 watts
D-C Plate Voltage - - - - - looo [1]
1500 V
D-C Plate Voltage - - - - - looo 1500 2000 volts
D-C Plate Voltage - - - - - looo [2]
2000 V
D-C Plate Voltage - - - - - looo 1500 2000 volts
D-C Plate Current [1]
28 mA
D-C Plate Current - - - - - 28 167 150 ma.
D-C Plate Current [2]
167 mA
D-C Plate Current - - - - - 28 167 150 ma.
D-C Plate Current [3]
150 mA
D-C Plate Current - - - - - 28 167 150 ma.
Plate Dissipation [1]
75 W
Plate Dissipation - - - - - - 75 75 75 watts AUDIO FREQUENCY POWER AMPLIFIER AND MODULATOR
Plate Dissipation [2]
75 W
Plate Dissipation - - - - - - 75 75 75 watts AUDIO FREQUENCY POWER AMPLIFIER AND MODULATOR
Plate Dissipation [3]
75 W
Plate Dissipation - - - - - - 75 75 75 watts AUDIO FREQUENCY POWER AMPLIFIER AND MODULATOR
D-C Grid Current [1]
28 mA
D-C Grid Current - - - - - 28 22 21 ma,
D-C Grid Current [2]
22 mA
D-C Grid Current - - - - - 28 22 21 ma,
D-C Grid Current [3]
21 mA
D-C Grid Current - - - - - 28 22 21 ma,
Peak R-F Grid Input Yoltage (approx.) [1]
320 V
Peak R-F Grid Input Yoltage (approx.) 320 355 425 volts
Peak R-F Grid Input Yoltage (approx.) [2]
355 V
Peak R-F Grid Input Yoltage (approx.) 320 355 425 volts
Peak R-F Grid Input Yoltage (approx.) [3]
425 V
Peak R-F Grid Input Yoltage (approx.) 320 355 425 volts
Driving Power, (approx.}) [1]
8 V
Driving Power, (approx.}) - - - - 8 [ 8 watts D-C PLATE YOLTAGE - - - - 3000 MAX. VOLTS
Driving Power, (approx.}) [2]
8 V
Driving Power, (approx.}) - - - - 8 [ 8 watts D-C PLATE YOLTAGE - - - - 3000 MAX. VOLTS
Driving Power, (approx.}) [3]
3000 V
Driving Power, (approx.}) - - - - 8 [ 8 watts D-C PLATE YOLTAGE - - - - 3000 MAX. VOLTS
Plate Power lnput [1]
215 mA
Plate Power lnput - - - - - 215 250 300 watts MAX-SIGNAL D-C PLATE CURRENT PER TUBE 225 MAX. MA.
Plate Power lnput [2]
250 mA
Plate Power lnput - - - - - 215 250 300 watts MAX-SIGNAL D-C PLATE CURRENT PER TUBE 225 MAX. MA.
Plate Power lnput [3]
300 mA
Plate Power lnput - - - - - 215 250 300 watts MAX-SIGNAL D-C PLATE CURRENT PER TUBE 225 MAX. MA.
Plate Power lnput [4]
225 mA
Plate Power lnput - - - - - 215 250 300 watts MAX-SIGNAL D-C PLATE CURRENT PER TUBE 225 MAX. MA.
Plate Power Output [1]
140 W
Plate Power Output - - - - - 140 175 225 watts PLATE DISSIPATION, PER TUBE - - - 75 MAX. WATTS
Plate Power Output [2]
175 W
Plate Power Output - - - - - 140 175 225 watts PLATE DISSIPATION, PER TUBE - - - 75 MAX. WATTS
Plate Power Output [3]
225 W
Plate Power Output - - - - - 140 175 225 watts PLATE DISSIPATION, PER TUBE - - - 75 MAX. WATTS
Plate Power Output [4]
75 W
Plate Power Output - - - - - 140 175 225 watts PLATE DISSIPATION, PER TUBE - - - 75 MAX. WATTS
GRID DISSIPATION, PER TUBE
13 W
GRID DISSIPATION, PER TUBE - - - - - 13 MAX. WATTS
MAXIMUM RATINGS Peak A-F Grid Input Voltage (per tube) [1]
205 V
MAXIMUM RATINGS Peak A-F Grid Input Voltage (per tube) 205 225 267 volts
MAXIMUM RATINGS Peak A-F Grid Input Voltage (per tube) [2]
225 V
MAXIMUM RATINGS Peak A-F Grid Input Voltage (per tube) 205 225 267 volts
MAXIMUM RATINGS Peak A-F Grid Input Voltage (per tube) [3]
267 V
MAXIMUM RATINGS Peak A-F Grid Input Voltage (per tube) 205 225 267 volts
Zero-Signal D-C Plate Current [1]
100 mA
Zero-Signal D-C Plate Current - - - 100 67 50 ma.
Zero-Signal D-C Plate Current [2]
67 mA
Zero-Signal D-C Plate Current - - - 100 67 50 ma.
Zero-Signal D-C Plate Current [3]
50 mA
Zero-Signal D-C Plate Current - - - 100 67 50 ma.
D-C PLATE YVOLTAGE [1]
3000 mA
D-C PLATE YVOLTAGE - - - - - 3000 MAX. YOLTS Max-Signal D-C Plate Current - - - 350 285 250 ma.
D-C PLATE YVOLTAGE [2]
350 mA
D-C PLATE YVOLTAGE - - - - - 3000 MAX. YOLTS Max-Signal D-C Plate Current - - - 350 285 250 ma.
D-C PLATE YVOLTAGE [3]
285 mA
D-C PLATE YVOLTAGE - - - - - 3000 MAX. YOLTS Max-Signal D-C Plate Current - - - 350 285 250 ma.
D-C PLATE YVOLTAGE [4]
250 mA
D-C PLATE YVOLTAGE - - - - - 3000 MAX. YOLTS Max-Signal D-C Plate Current - - - 350 285 250 ma.
MAX-SIGNAL D-C PLATE CURRENT PERTUBE [1]
225 mA
MAX-SIGNAL D-C PLATE CURRENT PERTUBE - 225 MAX. MA. Max-Signal Avg. Driving Power {approx.) 7 3 11 watts
MAX-SIGNAL D-C PLATE CURRENT PERTUBE [2]
7 mA
MAX-SIGNAL D-C PLATE CURRENT PERTUBE - 225 MAX. MA. Max-Signal Avg. Driving Power {approx.) 7 3 11 watts
MAX-SIGNAL D-C PLATE CURRENT PERTUBE [3]
3 mA
MAX-SIGNAL D-C PLATE CURRENT PERTUBE - 225 MAX. MA. Max-Signal Avg. Driving Power {approx.) 7 3 11 watts
MAX-SIGNAL D-C PLATE CURRENT PERTUBE [4]
11 mA
MAX-SIGNAL D-C PLATE CURRENT PERTUBE - 225 MAX. MA. Max-Signal Avg. Driving Power {approx.) 7 3 11 watts
PLATE DISSIPATION, PER TUBE [1]
75 W
PLATE DISSIPATION, PER TUBE - - 75 MAX. WATTS Max-Signal Peak Driving Power - - 26 23 19 watts
PLATE DISSIPATION, PER TUBE [2]
26 W
PLATE DISSIPATION, PER TUBE - - 75 MAX. WATTS Max-Signal Peak Driving Power - - 26 23 19 watts
PLATE DISSIPATION, PER TUBE [3]
23 W
PLATE DISSIPATION, PER TUBE - - 75 MAX. WATTS Max-Signal Peak Driving Power - - 26 23 19 watts
PLATE DISSIPATION, PER TUBE [4]
19 W
PLATE DISSIPATION, PER TUBE - - 75 MAX. WATTS Max-Signal Peak Driving Power - - 26 23 19 watts
Max-Signal Plate Power Output [1]
200 W
Max-Signal Plate Power Output - - 200 280 350 watts
Max-Signal Plate Power Output [2]
280 W
Max-Signal Plate Power Output - - 200 280 350 watts
Max-Signal Plate Power Output [3]
350 W
Max-Signal Plate Power Output - - 200 280 350 watts

Data set 03

1965 Eimac Tube Manual

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

Grid-Plate Capacitance
2.4 pF
Grid-Filament Capacitance
2.6 pF
Plate-Filament Capacitance
0.4 pF
Frequency Maximum
40 MHz
Typical Class-C Output Power
225 W
Typical Two-Tube Modulator Output Power
350 W