Hello,
This is maybe a dumb question, but as I understood it once, with Hackernaps and NCC amps, the 2,7k and 24k resistor an the input are the counterpart of the 27k feedback resistor, presenting nearly equal resistance to the long-tailed pair inputs (from output and GND, respectively).
In case of DC-absence at the input, a wire link instead of the input coupling capacitor is often promoted here.
When using a wire link for the input coupling cap, the 100k resistor of the input RC highpass is in parallel to the 24k resistor, effectively reducing the 26,7k resistance of 24+2,7k to something around 22k.
Since the hackernap then is directly coupled to the source any source-side parallel resistance reduces this even more.
Does this matter in terms of stability an/or sound quality? Is there a best practice approach?
Thanks
Florian
This is maybe a dumb question, but as I understood it once, with Hackernaps and NCC amps, the 2,7k and 24k resistor an the input are the counterpart of the 27k feedback resistor, presenting nearly equal resistance to the long-tailed pair inputs (from output and GND, respectively).
In case of DC-absence at the input, a wire link instead of the input coupling capacitor is often promoted here.
When using a wire link for the input coupling cap, the 100k resistor of the input RC highpass is in parallel to the 24k resistor, effectively reducing the 26,7k resistance of 24+2,7k to something around 22k.
Since the hackernap then is directly coupled to the source any source-side parallel resistance reduces this even more.
Does this matter in terms of stability an/or sound quality? Is there a best practice approach?
Thanks
Florian