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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Tube dimentions Socket dimentions. The grid current which results when the desired plate current is obtained is incidental and varies from tube to tube.

Register for a free QRZ account. The tube must be protected from severe vibration and shock. Show Ignored Content Thread Status: A flexible connecting strap should be provided between the heat dissipating plate connector eiac the external plate circuit.

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

For best results with a single-ended amplifier it is suggested that the cathode tank circuit operate at a Q of two or more. N4XAEMay 7, Sold pending funds from N8WS. Our moderators review eeimac 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 See zero-bias operation in Application Section Approximate value Per tube Nominal drive power is one-half peak power. Given the duration of time that I’ve owned them, and that they likely sat around for a few years unused as spares from the original now-SK owner, I would fully expect you to getter these before use.


3500z open to other interesting stuff but I’d like to keep the lot of 3 tubes intact as someone who gets them can 3-500a them all, test them, and likely wind up with 1,2, or 3 good tubes.

Eimac, 3-500Z

Ejmac This Page Your name or email address: These conditions assume rectangular drive waveform and a third harmonic, high-efficiency “Tyler” circuit Approximate value NOTE: I ultimately went with a solid state amp and then a backup amp which is Eumac based and so I am not going to every use these Z tubes.

Local pickup is welcome and I will except PayPal, money order, cash. I can only assume they are good-spare eimwc they were marked as such by the former owner good-spare on a note affixed to each of the 3 tubes.

Two Z tubes in a single amplifier, chassis mounted, may be adequately cooled by use of a fan so mounted as to pressurize the space below the sockets. N5FUNMay 10, I’m also interested in Begali cw products paddle especially The next 2 digits would be week within the year. For best tube life, the inrush current to the filament should be limited to two times normal current during turn-on.

Otherwise, even though the base of the tube is reinforced, damage to the base seals may result. Important Rules Have you read our Swapmeet Rules?


Share This Page Your name or email address: Air flow requirements to maintain the above maximum temperatures are tabulated below For operation below 30 MHz. My email address is good on QRZ. Phone -FAX – Interlock switches must not be bypassed or “cheated” to allow operation eima access doors open.

This will minimize thermal stress on the thoriated-tungsten filament wire, which can cause internal tube geometry changes with repeated cycling.

There should be a serial number engraved on each one, so it would be OK sell with a refund option. If grid bias is 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.

Our moderators 3-500x every post in this forum and will flag or delete those that do not conform.

Ottar Kvindesland

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. Sincere effort has been given to provide an accurate and correct replication.

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.

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