The Original grounded grid triode introduced in the early s. Now obsolete part number. Power dissipation: w. EIMAC Z. Later version of Z. The EIMAC Z is a compact power triode intended to be used as a zero- as high as twenty times can be obtained with the Z in a cathode-driven. Tube Z or Röhre Z ID, Transmitting Triode, air cooled, SPECIAL TUBEBASE in Brand: Eimac (brand name) Typ ZG mit Graphitanode.

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Operation with zero grid bias simplifies associated circuitry by eliminating the bias supply. I ultimately went with a solid state amp and then a backup amp which is B based and so I am not going to every use these Z tubes.

Sold! Eimac Z | QRZ Forums

I’m guessing those are date codes but no idea for certain. I can only assume they are good-spare as they were marked as such by the former owner good-spare on a note affixed to each of the 3 tubes. I’m also interested in Begali cw products paddle especially Breakage will result in in flying glass fragements, so safety glasses, heavy clothing, and leather gloves are recommended for protection. Filament voltage, as measured at the socket, should be maintained within the range of 4.

I do not know what they are worth.

Ottar Kvindesland

If grid bias 3-500 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. There should be a serial number engraved on each one, so it would be OK sell with a refund option. Share This Page Your name or email address: I’m open to other interesting stuff but I’d like to keep the lot of 3 tubes intact as someone who gets them can getter them all, test them, and likely wind up with 1,2, or 3 good tubes.


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Eimac, 3-500Z

Intermodulation values listed are those measured at the full peak envelope power noted. When handling a glass tube, remember that glass is a relatively fragile material, and accidental breakage can result at any time.

Local pickup is welcome and I will except PayPal, money order, cash. The Elmac Z is a compact power triode intended to be used as a zero-bias Class AB 2 amplifier in audio or radio-frequency applications. W0OLLJun 17, N5FUNMay 7, The kit came with 2 new Eimac Z’s with date codes as seen in the pictures, I broke the seal on the boxes last week in order take pictures of the tubes and double check the date codes.

This page has ben scanned and OCR’ed from the Eimac data-sheet.

Thoriated Tungsten Voltage 5. Not open for further replies. Sincere effort has been given to provide an accurate and correct replication. But like all things in life, there are no guarantees to that and no way for me to test otherwise. Adjustment of the rf grid voltage to obtain the specified plate current at the specified bias and plate voltages is assumed.

Shipping to Russia is more than the price offered and customs import is too difficult. Not open for further replies.

I got these several months back, out of an SK estate, in hopes of getting a amp. The grid current which results when the desired plate current is obtained is incidental and varies from tube to tube. I dont know what these are worth.


Sold! Eimac 3-500Z

Other Z tubes were labeled and boxed soft and short to ground and those were sold to a ham radio callsign display maker; I assume there was a method to the madness.

Go take a chance! Your name or email address: In addition, grounded-grid operation is attractive since power gain as high as twenty times can be obtained with the Z in a cathode-driven circuit. Interlock switches must not be bypassed or “cheated” to allow operation with access doors open.

The anode of the operates at a visibly red color at its maximum rated dissipation of Watts. The 4 digit is year of manufacture. N5FUNMay 10, Show Ignored Content Thread Status: When a socket other than the SK is used, provisions must be made for equivalent cooling of the base, the envelope, and the plate lead. K7JOEJun 16, Interelectrode Capacitance 1 Grounded Filament Connection. In all cases, air flow rates in excess of the minimum requirements will prolong tube life.

For best tube life, the inrush current to the filament should be limited to two times normal current during turn-on. Make sure that you’re familiar with the rules before posting or replying in this area.

K7JOEJun 17,