160562
You also need to consider the negative feedback if any around the amp, it too will lower the the output impedance and speed up it's precieved HF bandwidth.
Feedback can make a very average quality output transformer look reasonable, at the expense of less gain and some stablity, also some believe that the lush tube midrange can suffer as well, but maybe it's just the tighter bass because of the lower output impedance that takes away a bit of that midrange bloom.
A good test for an output transformer is to see it's bandwidth and damping factor (output impedance) with the feedback removed, this btw also increases the gain and can also make the amp more stable.
Really well made output transformers don't need feedback unless they have to drive harder speaker loads.
Cheers George
You also need to consider the negative feedback if any around the amp, it too will lower the the output impedance and speed up it's precieved HF bandwidth.
Feedback can make a very average quality output transformer look reasonable, at the expense of less gain and some stablity, also some believe that the lush tube midrange can suffer as well, but maybe it's just the tighter bass because of the lower output impedance that takes away a bit of that midrange bloom.
A good test for an output transformer is to see it's bandwidth and damping factor (output impedance) with the feedback removed, this btw also increases the gain and can also make the amp more stable.
Really well made output transformers don't need feedback unless they have to drive harder speaker loads.
Cheers George