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A PIN diode is switched off by applying DC reverse voltage to widen its. Original pin Johnson ceramic socket fits - 500Z, 4-125A, 4-250A, 4-400A tubes. The filament -voltage is typically 5. I re-soldered the filament pins – actually doing all five pins while I was. My trusty SB-2amplifiers have dual - 500Z tubes and are.

The two - 500Z tubes are connected in parallel.

Each of the three grid pins of the tube sockets is grounded to the chassis. The drive signal goes to the filament. Two - 500Z Zero Bias Triodes.

The - 500z triode tubes are shipped separately and must be installed. When I received this gem the filament connections on the - 500z finals was. The EIMAC - 500Z is a compact power triode intended to be used.

GENERAL CHARACTERISTICS. Feb Actually - The problems with the filaments of the - 500z tubes were NOT. The solder would literally melt out of the filament pins on the tube.

Aug If the filament checks OK at the pins, put the tube aside and go straight to the tube socket. Most amplifiers that use - 500Z tubes mount them in. I measured the filament voltage in a factory-built single - 500Z amplifier. Filament : Thoriated.

Calibrate R with a standard voltmeter connected to the filament pins on the tube. Also check the solder in the pins of the filament leads.

If it looks dull and like a cold solder joint it is possible the tube was run too hard or without. This is a list of vacuum tubes or thermionic valves, and low-pressure gas-filled tubes.

List_of_vacuum_tubesen. High-MU Power Triode. Heavy Graphite anode for high intermittent overload. Direct Interelectrode Capacitances (grounded filament ). Since the filament - pins are below the chassis, and the filament -seals and.

Reports of - 500Z - pin solder melting in SB-2amplifiers are very rare -with the. A single 3-50OZ triode tube. Tube Socket, Ceramic, pin, - 500Z, 3-500ZG, 4-400A, 4-400C, 4-125A. Archive-Catalogs › Eimac-Cat.

UP FOR AUCTION IS AN EIMAC - 500Z TRIODE TRANSMITTING TUBE.

THE FILAMENT PINS LOOK LIKE THEY HAVE BEEN REPAIRED ( RESOLDERED). Ameritron AL-Variants (all contain two - 500Z graphite tubes). The center “ pin ” in the base of this tube is hollow.

All - 500Z amplifiers use a grounded grid and drive the cathodes. I tested the filament pins (and 5) on the suspected culprit - 500Z and I AM reading continuity. In a valve the cat. When the product is of quality (i.e. - 500Z triode sold by RFParts) the amateur can.

V at 11A power supply. Remove the - 500Z tube from its shipping carton. One of the pins is separated by a large space from the other four pins. SPECIAL TUBEBASE in general Top contact with a cap.

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