Location: KY - Scotland
Posts: 5,470
I'm Mike.
Your loading resistor would still be in parallel with the 47k of the phono stage so Barry’s calculation still applies. However, in reality with 47k and a 100R loading resistor the calculation comes out as near to 100 as makes no difference.
https://www.allaboutcircuits.com/too...ce-calculator/
Listening in a Foo free Zone...
Only a Sith deals in absolutes.
Thanks. I understand the calculation still works. In other words, regardless of the resistor value, if I use the 47k setting the calculation shows I'm within a fraction of the original. So I was just wondering whether there was some other reason why I would keep the phono setting at 1000 instead of moving it to 47k and using a resistor at it's full value.
Location: Derbyshire
Posts: 542
I'm mark.
I missed the 47k setting, it makes life easier, so thats the way to go
AirTight PC7 needs a step-up transformer. That's how AirTight themselves handle them.
It's pretty high gain so something between 1:6 and 1:10 would be ideal, and run it into the MM setting.
Seriously get yourself a decent step-up and forget all this faffing with resistors.
At least try it out what have you got to lose? Frankly I've never heard a straight MC phono stage sound as good as a decent MM setting +quality SUT and that includes top-end stuff such as the Aurorasound Vida, one of the best out there. Or the Thoress Phono Equalizer which is mega-cool looking but doesn't have the magic straight to MC.