[Amps] IM distortion and such

[Will Matney]

Tom,

It says it on page two of the Eimac 3-500Z spec sheet. See the one the link was provided for earlier.

Quote;

RF Linear Amplifier 
Grounded-Grid, Class B

Maximum Ratings

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

*Approximate Value
** Measured Data From A Single Tube

End Quote

Better IMD was obtained by lowering the plate voltage under "(Minimum Distortion Products)" at -38 dB, 500W, and at 2000 Vdc.

Best,

Will



*********** 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.
>
>Will,
>
>Where did you get the idea 400mA is a "minimum distortion" 
>condition?
>
>73 Tom
>
>
>
>
>
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