It says it on page two of the Eimac 3-500Z spec sheet. See the one the link was
provided for earlier.
RF Linear Amplifier
Grounded-Grid, Class B
Typical operation (Minimum distortion products at 1 KW PEP input)**
DC Plate Voltage 2500V
Zero Signal DC Plate Current* 130 mA
Single-Tone DC Plate Current 400 mA
Single-Tone DC Grid Current 120 mA
Two-Tone DC Plate Current 280 mA
Two-Tone DC Grid Current 70 mA
Peak Envelope Useful Output Power 600W
Resonant Load Impedance 3450 Ohms
Intermodulation Distortion Products -33 dB
** Measured Data From A Single Tube
Better IMD was obtained by lowering the plate voltage under "(Minimum
Distortion Products)" at -38 dB, 500W, and at 2000 Vdc.
*********** REPLY SEPARATOR ***********
On 6/27/06 at 5:46 AM Tom W8JI wrote:
>> They can be used on up in current, say for pulse circuits
>> and RF heating. The 400 mA is the maximum plate current at
>> single tone for minimum distortion. That's for 600 watts
>> PEP useful power each. That's listed in the tables on page
>> 2 or 3 under a class B RF amp.
>Where did you get the idea 400mA is a "minimum distortion"
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