wrote in message ...
sorry I didn't elaborate, but what I've read is that the current created
by
the substrate heaters in concurrance with turbulence created by HOT
filters
negate any postive affect a SH can offer...

is that better? I dont' have any reference for this, just what I've read
over the last 2.5 years or so....

Are you saying that a HOT filter defeats having a substrate heater, or that
a HOT filter does the same thing a substrate heater is suposed to?

Harry




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