EIMAC YU-191/YU-191A HIGH-MU POWER TRIODE TUBE, US $150.00 – Picture 0

EIMAC YU-191/YU-191A HIGH-MU POWER TRIODE TUBE, US $150.00 – Picture 1

Eimac Yu-191/yu-191a High-mu Power Triode Tube

US $150.00

Colorado Springs, Colorado, United States
Jun 9th

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PRICE REDUCED - WAS $750.00 Specifications: SN: JNE081ZPLOC: 203B-7 Manufacturer: CPI-EIMAC Model: EIMAC YU-191/ YU-191A Type: High-mu water cooled power triode Electrical characteristics: Filament: Material: Thoriated tungsten Voltage: 7.5 +/- 0.37 V Current @ 7.5 V: 51.5 A Amplification factor, average: 160 Direct inter-electrode capacitances (grounded filament): Cin: 38.0 pF Cout: 0.6 pF Cgp: 24.0 pF Direct inter-electrode capacitances (grounded grid): Cin: 38.0 pF Cout: 24.0 pF Cpk: 0.6 pF Frequency of maximum ratings (CW): 110MHz Mechanical characteristics: Maximum overall dimensions: 10.4" L x 7.1" W (264mm x 180mm) Net weight: 5.5 lbs (2.5 kg) Operating position: Vertical, base up or down Maximum operating temperature: Envelope and ceramic/metal seals: 250 °C Cooling: Water Base: Special coaxial RADIO FREQUENCY LINEAR AMPLIFIER CATHODE DRIVEN Class A MAXIMUM RATINGS: DC PLATE VOLTAGE................... 5000 Volts DC PLATE CURRENT. ............... 2.5 Amperes PLATE DISSIPATION ................... 7000 Watts GRID DISSIPATION . .................... 225 Watts TYPICAL OPERATION: Plate Voltage 4800 4800 4900 Vdc Zero-Signal Plate Current1 0.35 0.35 0.36 Adc Single -Tone Plate Current 1.68 2.00 2.25 Adc Single-Tone Grid Current2 0.46 0.60 0.65 Adc Driving Power2 293 410 535 Watts Plate Dissipation 2275 2275 2275 Watts Single-Tone Plate Output Power 6000 7266 8250 Watts Resonant Load Impedance 1720 1425 1308 ? Driving Impedance 50.0 46.3 49.2 ? . Bias voltage may be required. 2. Approximate value. RADIO FREQUENCY LINEAR AMPLIFIER CATHODE DRIVEN Class B/C MAXIMUM RATINGS: DC PLATE VOLTAGE.......................5000 Volts DC PLATE CURRENT.................. 2.5 Amperes PLATE DISSIPATION .................... 7000 Watts GRID DISSIPATION........................ 225 Watts TYPICAL OPERATION Plate Voltage 4900 Vdc Grid Voltage -50 Vdc Plate Current 2.16 Adc Grid Current1 0.61 Adc Peak RF Cathode Voltage1 300 Volts Calculated Driving Power1 691 Watts Plate Dissipation 2315 Watts Useful Output Power2 7500 Watts 1. Approximate value. 2. Output circuit and filter loss of 10% assumed. NOTE: The equipment designer and user must assure that rated dissipation values are not exceeded. In continuous opertion (Class A) element dissipation is simply the product of voltage and current at the operating conditions. In pulsed operation the element dissipation is basically the product of voltage, current, and duty factor, though pulse shape and circuit conditions may effect actual dissipation values. NOTE: TYPICAL OPERATION data are obtained from direct measurement or by calculation from published characteristic curves. Adjustment of the rf grid voltage to obtain the specifi ed plate current at the specifi ed bias, screen and plate voltages is assumed. If this procedure is followed, there will be little variation in output power when the tube is changed, even though there may be some variation in grid and screen current. The grid and screen currents which result when the desired plate current is obtained are incidental and vary from tube to tube. These current variations cause no diffi culty so long as the circuit maintains the correct voltage in the presence of the variations in current. In the case of Class C Service, if grid bias is obtained principally by means of a grid resistor, the resistor must be adjustable to obtain the required bias voltage when the correct rf grid voltage is applied. RANGE VALUES FOR EQUIPMENT DESIGN Min Max Filament Current @ 7.5 volts…………….................................................. 48.0 54.0 A Interelectrode Capacitances1 (grounded fi lament connection) Cin ................................................................................................. 30.0 45.0 pF Cout ............................................................................................... --- 1.0 pF Cgp ......................................……................................................... 20.0 28.0 pF Interelectrode Capacitances1 (grounded grid connection Cin .................................................................................................. 30.0 45.0 pF Cout .....................................................................…........................ 20.0 28.0 pF Cpk…… .......................................................................................... --- 1.0 pF Zero Bias Plate Current ( Eb = 5000 Volts)…………………………………… 0.36 0.52 A Cut-off Bias (Eb = 5000 Volts, Ib = 1.0 mAdc……………………………………………… --- -45.0 V 1Capacitance values are for a cold tube as mounted in a shielded fixture. MECHANICAL MOUNTING – The YU-191 must be mounted vertically, base down or up at the convenience of the circuit designer. COOLING - The cooling data indicates the minimum flow and pressure drop across the tube required for various levels of anode dissipation. The cooling water outlet temperature should not exceed 70°C. The filament stem structure also requires forced air cooling. A minimum of 6 cfm should be directed into the space between the inner and outer fi lament contacting surfaces. A major factor effecting long life of water cooled tubes is the condition of the cooling water. High purity water must be used to minimize power loss, corrosion of metal fi ttings, and loss of anode dissipation capability. Water resistivity must be maintained at 1 megohm/cm (at 25°C) or better for long term operation. EIMAC Application Bulletin #16 should be consulted for details on maintenance of water quality standards and use of a water purifi cation loop in the installation. Since the anode is normally at high potential to ground, water connections to the anode are made through insulating tubing, with long enough sections that column resistance is above 4 megohms per 1000 plate supply volts, or 10 megohms total, whichever is less. APPLICATION Anode Dissipation(kW) WaterFlow(gpm) PressureDrop(psi) 2 0.9 0.4 4 1.3 0.8 6 2.0 1.7 7 2.4 2.3

Condition:	Used: An item that has been used previously. The item may have some signs of cosmetic wear, but is fully operational and functions as intended. This item may be a floor model or store return that has been used. See the seller’s listing for full details and description of any imperfections. ...	Brand	EIMAC
MPN	JNE081ZP
Model	YU-191/YU-191A