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3-400Z vs. 3-500Z Comparison

Comparison of 3-400Z and 3-500Z Tubes
EIMAC 3-400Z
The Original grounded grid triode introduced in the early 1960s. Now obsolete part number. Power dissipation: 400w.

EIMAC 3-500Z
Later version of 3-400Z having larger fins for the increased power dissipation of 500w. Slightly larger body requires minor changes to fit where 3-400s were used. Requires heat dissipating connector.

3-500ZG
Graphite anode version of 3-500Z. Anode dissipation approximately 600w (additional air flow may be required). Graphite anode provides a more rugged tube. Produced by Eimac, RF PARTS, Taylor, Amperex (3-500Z/8802), etc.

3-500C
Generic Chinese Graphite tube.

3-600Z
Proposed Russia tube. Only prototypes were produced. No production, project was discontinued due to technical problems.

 

Comparison of 3-500Z Manufacturers
3-500z eimac 3-500z rfp 3-500z amperex
EIMAC   

Eimac was the original designer of 3-500Z line, and is generally considered the "standard" for comparison. Eimac no longer produces 3-500Z or other glass tubes.

AMPEREX   

An excellent graphite anode tube of quality equal to Eimac 3-500ZG. Late production made in France, marked 3-500Z /8802.
1 Year Limited Warranty from RF Parts.

RF PARTS   

"RFP" line is the best quality graphite anode tube in the Eimac® format. 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 Partsâ testing. 2 year Limited Transmitter Tube Warranty (2nd year prorated). Made in China.

TAYLOR   

First Quality Tube at a Competitive Price. The Taylor 3-500ZG receives the full 100% testing and inspection as the RFP tube. One year Limited Transmitter Tube Warranty. Made in China.


 

3-500ZG Taylor
3-500ZG Taylor
First Quality Tube at a Competitive Price

These tubes carry 2 Year Limited Warranty (against manufacturing defects and workmanship) through RF PARTS.



3-500ZG RFP
3-500ZG RF Parts

"RFP" line is the best quality graphite anode tube in the Eimac® format. 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.

These tubes carry 3 Year Warranty (against manufacturing defects and workmanship) through RF PARTS.

 

 

3-500ZG Amperex
3-500ZG Amperex

Graphite anode tube of superior quality equal to Eimac 3-500ZG. Made in France, and marked 3-500Z/8802.

These tubes carry 1 Year Limited Warranty (against manufacturing defects and workmanship) through RF PARTS.