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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3-500Z Tubes

Intermodulation values listed are those measured at the full peak envelope power noted. In addition, grounded-grid operation is attractive since power gain as high as twenty times can einac obtained with the Z in a cathode-driven circuit.

Breakage will result in in flying glass fragements, so safety glasses, heavy clothing, and leather gloves are recommended for protection. I’m guessing those are date codes but no idea for certain.

Ottar Kvindesland

For best results with a single-ended amplifier it is suggested that the cathode tank circuit operate at a Q of two or more. Filament voltage, as measured at the socket, should be maintained within the range of 4.

N5FUNMay 7, 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. The grid current which results when the desired plate current is obtained is incidental and varies from tube to tube. The only discernible identification numbers are 4-digit numbers in red ink on the tubes- one tube is 90XX, one tube is 87XX and one tube is 70XX. 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 current.


My email address is good on QRZ. K1FBIJun 17, W0OLLJun 17, Register for a free QRZ account.

Not would of gave Make sure that you’re familiar with the rules before posting or replying in this area. Other Z tubes were labeled and boxed soft and short to ground and those were sold eimwc a ham radio callsign display maker; I assume there was a method to the madness.

Two Z tubes in a single amplifier, chassis eimqc, may be adequately cooled by use of a fan so mounted as to pressurize the space below the sockets.

N5FUNMay 10, Air flow requirements to maintain the above maximum temperatures are tabulated below For operation below 30 MHz.

Sold! Eimac 3-500Z

K7JOEJun 17, After research I do not have the equipment or know how to De-Gas the tubes before use and did not want to risk using them so I installed a set of RF Parts ZG’s I had for another amplifier. Hi All, not quite sure how to work this one but here goes: Our moderators review every post in this forum and will flag or delete those that do not conform.

I’m open to reasonable suggestions too, as surely there’s someone who knows his way around amplifiers and Z tubes and is looking for a bargain In all cases, air flow rates in excess of the minimum requirements will prolong tube life. KG9DDJun 17, Shipping wimac Russia is more than the price offered and customs import is too difficult. I dont know what these are worth.

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SOLD – N.O.S. Eimac z tubes dates | QRZ Forums

Share This Page Your name or email address: I’m also interested in Begali cw products paddle especially 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.

The 4 digit is year of manufacture. This week I completed building it and am now testing and have a few minor items to adjust. The tube must be protected from severe vibration and shock. For best tube life, the inrush current to the filament should be limited to two times normal current during turn-on. The next 2 digits would be week within the year.

Design equipment so that no one can come in contact with high voltages. Adjustment of the rf grid voltage to obtain the specified plate current at the specified bias and plate voltages is assumed.