>
>Rich says:
>
>> Specify a triode for Class AB1 grid-driven linear service, and I'll have
>> a go at it with the appropriate characteristic-curves
>
>The original question was about using tubes like a 450TL. I figure AB2 is
>necessary for things like that.
? Typical total IMD figures for Class AB2 grid-driven service seems to
be around minus 20db below pep for ssb voice modulation. Substantial
grid-current in grid driven service equals substantial distortion.
> Are there triodes specified for AB1 grounded
>cathode operation these days?
? Not specified. The characteristic-curves tell the story.
>The requirement is that at zero grid volts, it
>has to draw pretty substantial plate current,
? indeed
>and I don't know what there is
>around that would do that.
? The 3CX2500A1 and the 3CX3000A1.
- cheers, Peter
Rich...
R. L. Measures, 805-386-3734, AG6K, www.vcnet.com/measures
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