PI/Headroom in A15MK2

Below is the PI to the Madamp A15MK2 that was just finished:

[Blockierte Grafik: http://i26.photobucket.com/albums/c109/prof2915/LTP.jpg]

(Not seen, there´s also a 56k NFB resistor wired to the 4 ohm output at the OT)

This PI is obviously from a "Brownface" Fender 6G3 Deluxe and I´ve heard totally contradictionary statements beeing made about it...

Someone claims that this PI is designed to clip early on and that I would get a much better headroom if using standard "Marshall values": 470R/10k/4,7k.
Someone else says that I will lose "bite and dynamics" if increasing R44 from 1,5k to 4,7k as more of the NFB will go into the PI.

Regardless the NFB - that can be adjusted according to the design of the LTP - would the "Marshall values" (and especially lowering R42 from 680R to 470R) give me more headroom in the PI?

Would MAD maybe care to share some thoughts on this?

Thanks

Zitat von Kramusha;233509

For more headroom you can try a constant current sink. This will increase the output voltage a lot.

I will upload a picture..

Stefan

Looking forward to that!