Buffer instead of amp for low impedance headphones

[Jupiter]

Quote:

Originally posted by zzz probably something like that. bias points were pulled out of the hat.

What's the value of the resistor on the right? Or maybe that's the headphone load?

So this should work, but might not sound very good? Or will I have to experiment with resistor/cap values and psu voltages to get this working properly?


Maybe somebody has a schematic for an alternative tubed (or hybrid) buffer that will perform better? At the moment I have promising alternatives with ICs and discrete components. Something with tubes should be fun, too.

 

[Joe Lau]

6BQ5 connect in Psudo triode cathode follower. Grid wit a resistor to ground.

 

[zzz]

Quote:

Originally posted by Jupiter What's the value of the resistor on the right? Or maybe that's the headphone load? So this should work, but might not sound very good? Or will I have to experiment with resistor/cap values and psu voltages to get this working properly? Maybe somebody has a schematic for an alternative tubed (or hybrid) buffer that will perform better? At the moment I have promising alternatives with ICs and discrete components. Something with tubes should be fun, too.

resistor on the right should be 1M or something. the circuit will work. spice tells me that distortion content consists mostly of odd-harmonics (as high as -25db at 1khz), so eh.

as for various solid state, tube, and hybrid buffers, look here.

 

[Jupiter]

zzz, thanks for the link

I've been looking at this circuit (from zzz's link):

Anyone know if this buffer has any potential? If it does, I'll build it with quality parts. If not, I'll build a cheap one. (Just to get some experience with tubes.)

 

[Jupiter]

The buffer circuit