SemiSouth boiler room

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I have curves comparing performance for many of these parts in
Common Source mode, including the UJN1208K against the IRFP240.

The 1208K can behave very comparably, and the biggest difference from
a performance standpoint is that it has quite a bit lower Drain impedance,
so it is more amenable to "tweaking" via the harmonic adjustment pot and
it likes lots of voltage.
 
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