I'm building a couple of NYD one bottle preamps and I was wondering if anyone had tried different value resistors in the pad.
It's listed as a 20DB pad , I seem to be getting more like 23-25 db which is a pretty big drop.
I am using 12AT7 in the circuit instead of 12AV7 which I know will skew things a little.
Does anyone know the values to use for a 10 or 15db pad?
thanks
It's listed as a 20DB pad , I seem to be getting more like 23-25 db which is a pretty big drop.
I am using 12AT7 in the circuit instead of 12AV7 which I know will skew things a little.
Does anyone know the values to use for a 10 or 15db pad?
thanks
Depends on source impedance and actual input impedance of preamp (which may vary somewhat with frequency). It would drop 20 dB with a very high preamp input impedance, a bit more in real life. 10 dB would be about 3:1 voltage, 3 equal resistors, say 221 Ohms each. Put a trimmer pot in place of the last resistor and adjust it for the attenuation you want.
