The RF Parts 3-500ZG™ is a compact power triode intended to be used as a zero-bias Class AB2 amplifier in audio or radio-frequency applications. Operation with zero grid bias simplifiers assocated circuitry by eliminating the bias supply.

Virtually an exact copy of the Eimac 3-500ZG in both mechanical and electrical characteristics. RF PARTS 3-500ZG easily represents the best value for the price. All tubes receive 100% RF PARTS testing.

Excellent packing with foam and peanuts, fast shipping. Placed matched pair of 3-500ZG's in my SB-220, and they worked better than the original Eimac tubes. 40 watts carrier drive in - 400 watts out. DC power in vs power out for 72% efficiency in the amp. Great purchase and would buy again. 73, K4LJF. Time Owned: 0 to 3 months.

This tube is a Heavy Duty Graphite Anode version of the original Eimac 3-500Z, and it has a stronger Anode stem-support to add to the tube's ruggedness and stability.  The Graphite Anode, Grid, and Filament are virtually the same as the Graphite version last offered by Eimac, and is interchangeable with this vastly improved transmit tube.  MFR: China SKU: 3-500ZG-RFP-M3

The RF Parts 3-500ZG™ is a compact power triode intended to be used as a zero-bias Class AB2 amplifier in audio or radio-frequency applications. Operation with zero grid bias simplifiers assocated circuitry by eliminating the bias supply.

We provide genuine 3-500Z replacement components backed by our quality guarantee. Choose from multiple or a single 3-500Z tube for sale. The 3-500Z tube stands as one of the most versatile and powerful transmitting tubes in the amateur radio and industrial sectors.

The 3-500ZG is a transmitting vacuum tube designed for use in high-power RF (radio frequency) applications. The tube uses a filament to heat up the cathode, which then emits electrons into the tube. The electrons are accelerated towards the anode, where they interact with the electric field to produce an amplified RF signal.

I purchased a new matched set of RF Parts 3-500ZG tubes and installed them. What a difference! More power out with less power in, and the new set never goes BANG like the old ones frequently did.

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