"Meat Plow" wrote in message
news
On Tue, 23 Nov 2010 18:21:50 +0000, Steve Sousa wrote:

That's a heck of a difference in DC resistance. If you drive both with a
sig generator and look at the secondaries on a scope is there a big
difference in the signal amplitude between the two? If not I would be
inclined to replace the tube and take some voltages while the circuit is
live while monitoring the plate currents. You can look here for
operational voltages and currents in different classes of operation:

http://www.nj7p.org/Tube4.php?tube=6gu8

hello:

there was about half division difference on the scope. I was trying to avoid
testing with the valve because it's expensive and "rare" i don't want to
take much risks....