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Aside from that, the Barber Gain Changer covers a wide range of gain, sounds ace and is pretty quiet..
The stock chip in a lot of pedals is the TL072 and it is over 30 yrs old and there ARE now better, quieter ones!
That said, most of the noise in high gain circuits comes from the resistors, not the active devices. This can be reduced by clever design , basically keeping R values low but, as Beexter says, noise is inherent in such high gain devices.
One solution is a noise gate and another (not used in pedals AFAIK? ) pre and then de emphasis. Both systems have their drawbacks especially the latter with headroom, mainly because the is very little with a 9 volt supply.
Dave.
Rift Amplification
Brackley, Northamptonshire
www.riftamps.co.uk
My old bass player had a bunch of cheap pedals, a 10 quid PSU and crap cables and it made such a racket but it was the culmination of all factors.
Not easy to test the theory unless you have a guitarist mate who you can compare pedal set ups with.