TUBE 4-1000A / 8166

GENERAL DESCRIPTION


photo 4-1000A The 4-1000A / 8166 is a radial-beam tetrode with a maximum plate dissipation rating of 1000 watts. Intended for use as an amplifier, oscillator, or modulator, the 4-1000A / 8166 is capable of efficient operation well into the VHF range.

In FM broadcast service on 110 MHz, two 4-1000A / 8166 tetrodes will deliver a useful output power of over 5000 watts.

Operating under class AB2 modulator conditions with less than 10 watts of peak driving power, two of these tubes will deliver 3900 watts of output power.

In class AB1, a pair of 4-1000A / 8166 tetrodes will deliver 3800 watts of ouput power.

Cooling of the tube is accomplished by radiation from the plate and by circulation of forced-air through the base and around the envelope. Cooling can be simplified through the use of the SK-500 Air-System Socket.		 picture 4-1000A


TECHNICAL SPECIFICATIONS
Plate Dissipation (Max.) 1000 watts
Screen Dissipation (Max.) 75 watts
Grid Dissipation (Max.) 25 watts
Frequency for Max. Ratings (CW) 110 MHz
Cooling Radiation & Forced Air
Filament
 Voltage
 Current		 Thoriated Tungsten
7.5 volts
21.3 amperes
Capacitances (Gnd. Cath. Connection)
 Input
 Output
 Feed-through
28.1 pF
8.1 pF
0.3 pF
Amplification Factor (g1-g2) 6.9
Transconductance 10,000 μmhos
Base 5-Pin Special
Recommended Air-System Socket SK-510
Recommended Air Chimney SK-506
Recommended Heat Dissipating Connector HR-8
Maximum Seal Temperature 200°C
Maximum Envelope Temperature 225°C
Maximum Length 9.63 in; 244.60 mm
Maximum Diameter 5.25 in; 133.30 mm
Weight (approximate) 1.5 lb; 0.68 kg
Operating Position Vertical, base up or down
Specifications may change without notice

THIS TUBE IS USED IN THE FOLLOWING SHORTWAVE BROADCAST TRANSMITTERS
Manufacturer Transmitter specifications Power in kW
Continental Electronics 420 A 500
Gates HF-1 M 1


THIS TUBE IS AVAILABLE FROM
Manufacturer Rebuilder Distributor
Covimag
Richardson Electronics
Penta Laboratories



PRICE LEVEL (US$)
1 2 3 4 5 6
0 - 10 10 - 100 100 - 1000 1000 - 10,000 10,000 - 50,000 50,000 - 100,000