what is it, where does it go and what is the purpose of it? I think I know what it is but I can't find a definitive description anywhere so what better place to ask than the Tube-o-phile Circle.
Hi Midfi,
Buffer stage has less gain and generally has lower but not zero harmonic/IM distortion (Depends upon the design, cathode follower, common cathode with large negative feedback etc). Since it uses parts musical degradation almost always occurs as in any other design.
High frequency response is generally greater, one can use longer, high capacitance ICs. However, it is advantageous to limit capacitance as much as possible.
Low frequency limitations are as any other stage; due to either capacitive or transformer coupling.
DC output coupling eliminates low frequency loss, but an additional power supply is usually necessary, and DC offset circuitry is almost always necessary.
Cheers.
