The filament supply has inrush current limiting to insure maximum tube life. Ameritron AL-Variants (all contain two - 500Z graphite tubes). The center “ pin ” in the base of this tube is hollow.
In a valve the cat. 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. 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.
Ameritrons legendary AL-80A kilowatt amplifier has been completely redesigned and extensively improved.
The all New AL-80B kilowatt output desktop linear. 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. Heat the pins with a big soldering iron and gently remove from the tube, clean bare pin and.
GENERAL CHARACTERISTICS1. Filament : Thoriated. Calibrate R with a standard voltmeter connected to the filament pins on the tube.
I measured the filament voltage in a factory-built single - 500Z amplifier. 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. Heavy Graphite anode for high intermittent overload. High-MU Power Triode. 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).
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. 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.
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