" Didn't
one
of the tubes use a deflection angle other than 90 degrees?"
I beleive the Ampliphone has an angle < 90 deg
Someone else will have to do the inductance measurements
on that yoke, since I didn't have one to measure.
"And
isn't there a good reason for NOT using 90 degree tubes"
I suspect any tube you will be able to buy at resonable
prices in 1999 will have deflection angles greater than
90 deg, and will have a smaller diameter neck as well.
Greater deflection angles will increase problems with
linearity and power required of the deflection amps
also.
