GM-3B
High-power modulator triode
Description
Purpose and application
GM-3B is a high-power modulator triode for amplifying low-frequency oscillations in cathode-coupled circuits. It is intended for stationary radio equipment and modulator stages.
Full descriptionCollapse description
Construction
The metal-glass tube has a large finned anode and terminal assembly above the insulating ring. Heater voltage is 6.0–6.6 V; starting heater current may reach 225 A.
Operating data
Reference limits include anode voltage up to 6 kV, anode dissipation up to 7.5 kW and grid dissipation up to 300 W. Typical transconductance is 22 ± 5 mA/V and gain factor 9 ± 2.
Cooling and selection
The anode requires forced-air cooling, with published data indicating approximately 800 m³/h. The tube is installed vertically; dimensions are up to 245 × 120 mm, mass up to 4 kg and minimum service life 2000 h.
The operating principle is covered in the vacuum tube article. Related devices are listed under generator and modulator tubes.
Technical details
- Designation
- GM-3B
- Device type
- High-power modulator triode
- Purpose
- Low-frequency amplification in cathode-coupled circuits
- Construction
- Metal-glass with finned anode
- Heater voltage
- 6.0–6.6 V
All specificationsCollapse specifications
- Maximum starting heater current
- 225 A
- Maximum anode voltage
- 6 kV
- Maximum anode dissipation
- 7.5 kW
- Maximum grid dissipation
- 300 W
- Transconductance
- 22 ± 5 mA/V
- Gain factor
- 9 ± 2
- Cooling
- Forced air, approximately 800 m³/h
- Operating position
- Vertical
- Maximum dimensions
- 245 × 120 mm
- Maximum mass
- 4 kg
- Minimum service life
- 2000 h
Payment & delivery
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Payment & delivery terms