5v333
Well-known member
i am unsure how to see this.
if i have a 15K puspull output transformer, what impedance does it want to see coming from to triodes?
is it 15K or 2-5 times lower?
when the feedback loop in my circuit is open, the low freq roll off is about 12hz but when i close the loop it moves don to about 3hz. and this must be because output impedance is reduced.
if i add a local plate to grid feedback, i can rebalance to get my roll off back up to 12hz.
i asked lundahl about the properties of my transformer and he pointed out that the roll off is depending on the source impedance and the inductance which in this case should be around 200H.
R/(2xPIxL) = f
15K/(2xPIx200) = 11,9hz
and by the way, what did the cheese say in the morning in front of the mirror?
if i have a 15K puspull output transformer, what impedance does it want to see coming from to triodes?
is it 15K or 2-5 times lower?
when the feedback loop in my circuit is open, the low freq roll off is about 12hz but when i close the loop it moves don to about 3hz. and this must be because output impedance is reduced.
if i add a local plate to grid feedback, i can rebalance to get my roll off back up to 12hz.
i asked lundahl about the properties of my transformer and he pointed out that the roll off is depending on the source impedance and the inductance which in this case should be around 200H.
R/(2xPIxL) = f
15K/(2xPIx200) = 11,9hz
and by the way, what did the cheese say in the morning in front of the mirror?