3500Z filament pins

Oct Open filaments are primarily a function of off-on thermal cycles, mechanical shock, or poor tube assembly or filament processing. The article neglects all common - 500Z failures. Testing the - 500Z using the pins numbering and testing the 500Z tube pin.

The EIMAC - 500Z is a compact power triode intended to be used as a. Direct Interelectrode Capacitances (grounded filament )2.

The Elmac - 500Z is a compact power triode intended to be used as a zero-bias. Base, Pin Special. May I own a Drake L-amplifier where the tube has recently gone dark.

When I pull the tube and conduct a continuity test on the filament pins, I get. Apparently the high level of heat can degrade the solder in the pins over time, causing an intermittent condition in the filament. Z filament acting up! This is the amplifier that I added a blower.

Z tubes was not "lit" (i.e. the filament was not on).

After taking the amp apart I discovered that the dark tube had a filament pin whose solder had slightly. 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. 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. List_of_vacuum_tubesen. High-MU Power Triode.

Heavy Graphite anode for high intermittent overload. In the course of time, molecular particles sliding along the pins into the tube. 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).

In a high amplification triode such as the - 500Z, the filament helices clear the grid. 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 3-500ZG is directly interchangeable with Eimac's - 500Z version.

The filament -voltage is typically 5. I re-soldered the filament pins – actually doing all five pins while I was. 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.