3-1000H RICHARDSON ELECTRONICS, 3-1000H Datasheet - Page 3

• Manufacturer Part Number: 3-1000H
• Description: Electron Tube
• Manufacturer: RICHARDSON ELECTRONICS

Specifications of 3-1000H

• Drop Ship: 58P0542

3-1000H
HIGH MU
POWER TRIODE
APPLICATION
MOUNTING — The 3-1000H must be operated vertically, base up or base down. A flexible connecting strap should
be provided between the HR-8 Heat Dissipating Connector on the plate terminal and the external plate circuit. The
tube must be protected from severe vibration and shock. The SK-510 socket or equivalent must be employed to
prevent excess lateral pressure on base pins and seal of the tube.
COOLING — Forced-air cooling is required to maintain the base seals at a temperature below 200°C and the plate
seal at a temperature below 225°C. When using the SK-510 Air-System Socket and SK-516 Chimney, a minimum
air flow rate of 25 cubic feet per minute at a static pressure of approximately 0.43 inch of water, as measured at the
socket at sea level, is required to provide adequate cooling at an inlet air temperature of 50°C. Above 30 megahertz,
the required air flow is increased to 35 cubic feet per minute at a static pressure of approximately 0.8 inch of water,
as measured at the SK-510 socket. Cooling air must be supplied to the tube even when the filament alone is on during
standby periods.
When a socket other than the SK-510 is used, provisions must be made for equivalent cooling of the base, the
envelope, and the plate seal. In all cases, air flow rates in excess of the minimum requirements, will prolong tube life.
FILAMENT OPERATION — The rated filament voltage for the 3-1000H is 7.5 volts. Filament voltage, as measured
at the socket, must be maintained within the range of 7.13 to 7.87 volts to obtain maximum tube life. Operation at
reduced voltage decreases emission capability, but increases life expectancy.
HIGH VOLTAGE — Normal operating voltages used with the 3-1000H are deadly ; the equipment must be designed
properly and operating precautions must be followed. Design all equipment so that no one can come in contact with
high voltages. All equipment must include safety enclosures for high-voltage circuits and terminals, with interlock
switches to open primary circuits of the power supply and to discharge high-voltage condensers whenever access
doors are opened. Interlock switches must not be bypassed or “cheated” to allow operation with access doors open.
Always remember that HIGH VOLTAGE CAN KILL.
INTERELECTRODE CAPACITANCE — The actual internal inter-electrode capacitance of a tube is influenced by
many variables in most applications ; such as stray capacitance to the chassis, capacitance added by the socket used,
stray capacitance between tube terminals and wiring effects. To control the actual capacitance values within the tube,
as the key component involved, the industry and the military services.
Page 3 of 4