>
>On Wed, 23 Jul 97 19:15:00 -0700 Rich Measures <measures@vc.net> writes:
...snip...
>I built quite a few one and two 4-1000A amps in AB2 that were quite
>clean. The key was regulated bias and screen supplies.
>
How much screen V? How much grid current? How did you regulate the grid
bias V?
- Did you measure the IMD yourself, or did you accept on the air
reports?
>...... What
>would the distortion difference be between AB1 and AB2? I do not know.
>
>73....Carl KM1H
>
It depends on how much grid current you run. For example, with 1000V on
the screen, 7kV on the anode, and 0mA of grid current (Class AB1), the
4-1000A/8166 is fairly linear. If the grid current were increased to
0.05mA, technically speaking the amplifier would be running in Class
AB2---and it would still be fairly linear. However, if the grid current
was 5mA, IMO, there would be a substantive decrease in linearity. ... ...
Eimac does not list the 8166 for Class AB2 linear service.
Rich---
R. L. Measures, 805-386-3734, AG6K
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