> 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