12-14-2013, 08:08 PM
morzh;
Well, I compared the differences against the H-K A300 which uses 7408/6V6GTs in a similar Williamson push-pull circuit and although the windings do differ, they are only different by about 7%. In this unit if you take an average of the two resistances and compare the two readings one is 1300% different and the other is 69% different. Unless there is something else going on I can't see why there would be that much different. Maybe 10 or 15%, but 1300% or 69%? It just does not seem reasonable. I might connect it to my Heathkit impedance bridge and see what I measure there using a 1kHz tone.
I looked at my calculations on the Stancor and realized that I did the math wrong. However the last portion of the winding is about 87% higher resistance than the first portion of the winding.
Joe
Well, I compared the differences against the H-K A300 which uses 7408/6V6GTs in a similar Williamson push-pull circuit and although the windings do differ, they are only different by about 7%. In this unit if you take an average of the two resistances and compare the two readings one is 1300% different and the other is 69% different. Unless there is something else going on I can't see why there would be that much different. Maybe 10 or 15%, but 1300% or 69%? It just does not seem reasonable. I might connect it to my Heathkit impedance bridge and see what I measure there using a 1kHz tone.
I looked at my calculations on the Stancor and realized that I did the math wrong. However the last portion of the winding is about 87% higher resistance than the first portion of the winding.
Joe
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