TT15

Twin beam tetrode with two equivalent systems for push-pull VHF RF power amplification and audio service, with reduced-input operation extending to approximately 250 MHz.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 2
Base: -
Socket code: -
Base pins: -
Nominal heater: 6.3 V / 1.6 A

Description

The TT15 is a twin beam-tetrode valve with two equivalent systems for push-pull RF power-amplifier and audio-amplifier 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: 6.3 V
Nominal heater current: 1.6 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

2 physical sections, each with unique specifications.

Section 1

Beam Power

X-ray radiationInterelectrode capacitances

Transconductance: 0.0039 S
Max plate voltage: 400 V
Max screen voltage: 200 V
Max plate dissipation: 75 W
Max screen dissipation: 1.25 W

Representative section row for two equivalent systems. Published maximum ratings and characteristics audited; remaining useful numerical data retained in parameter table.

Section 2

Beam Power

X-ray radiationInterelectrode capacitances

Transconductance: 0.0039 S
Max plate voltage: 400 V
Max screen voltage: 200 V
Max plate dissipation: 75 W
Max screen dissipation: 1.25 W

Second identical physical beam-power section.

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

1955 Marconi

Published operating points and test conditions from this source.

SECTION 1

Beam Power

Other

reduced inputs, up to
250 MHz
reduced inputs, up to 250 Mc/s.
Grid Resistor. The maximum permissible DC grid to cathode [1]
1
Grid Resistor. The maximum permissible DC grid to cathode 1 90 mA
Grid Resistor. The maximum permissible DC grid to cathode [2]
90
Grid Resistor. The maximum permissible DC grid to cathode 1 90 mA
These values assume that a stabilised power supply of very low I, [1]
12 W
These values assume that a stabilised power supply of very low I, 12-5 mA
These values assume that a stabilised power supply of very low I, [2]
-5 W
These values assume that a stabilised power supply of very low I, 12-5 mA
impedance is used. Ia (a) [1]
2 ohm
impedance is used. Ia (a) 2:5 mA
impedance is used. Ia (a) [2]
5 ohm
impedance is used. Ia (a) 2:5 mA
( [1]
2 W
(2) PUSH-PULL RF POWER AMPLIFIER. Zto mod 3,130 O
( [2]
3130 W
(2) PUSH-PULL RF POWER AMPLIFIER. Zto mod 3,130 O
Viz [1]
175
Viz 175 175 v Greater anode inputs in the carrier conditions may be
Viz [2]
175
Viz 175 175 v Greater anode inputs in the carrier conditions may be
Vinpk) gt [1]
-81 W
Vinpk) gt -81) 110 110 v The anode dissipation must not exceed 15 W under
Vinpk) gt [2]
110 W
Vinpk) gt -81) 110 110 v The anode dissipation must not exceed 15 W under
Vinpk) gt [3]
110 W
Vinpk) gt -81) 110 110 v The anode dissipation must not exceed 15 W under
Vinpk) gt [4]
15 W
Vinpk) gt -81) 110 110 v The anode dissipation must not exceed 15 W under