Hi again Joe...yep it's me again
I've been wondering about the ratio for the EA2622 in my BA-312 style...
You recommended wiring the primaries in series with the LOW ratio jumper fitted to give 1:3.5...
...it 2 primary windings so low ratio will give 600ohm input with normal 15k load which is 1:3.5 ratio
Is the formula for working out the input impedance as follows?:
Input Z=Rload/(Transformer Ratio Squared)?
So wouldn't 15k Rload give an input impedance of around 1200ohm? What am I missing? Does this get shared across the 2 primary windings, because they are in series to give 600...?
Also, most of what I've read recommends running the EA2622 in parallel to give 1:7...is there a reason you recommend 1:3.5?
Is there any reason I couldn't try the EA2622 with two ratio jumpers running a HIGH 1:7? (ie could I damage anything?)
If I do, will the 100k Log pot and 15k series resistor be ok for the RLoad? Or should I up it?
I've got the above formula right I figure at 1:7 I would have a input Z range of 300ohm to about 2.4K which seems about right to me...
Let me know what you think...
Again many thanks for taking the time to educate me! I swear I'm nearly done!!!