6AS7 OTL headphone amplifier

[kodabmx]

R6 serves to discharge C1?

Exactly I use 0.47uF dor interstage capacitor.

So does R36 as drawn.

 

[audiowize]

It's input cap will be in series with the output cap.

Yeah, so you still have 0.47uF feeding a 10K load.

 

[merlin el mago]

So does R36 as drawn.

R36 is the load.

 

[merlin el mago]

Yeah, so you still have 0.47uF feeding a 10K load.

I guess 150K.

 

[kodabmx]

Yeah, so you still have 0.47uF feeding a 10K load.

Provided the subwoofer has a 0.47u input cap, which would indicate a 33Hz -3 point. In reality that's way small for a input cap on a sub.
I just built a 12SN7 buffer that uses 100u coupling caps (it feeds a 1k load).

 

[farkincza74]

Hi,
I want to build this amplifier, do you have any good or bad experiences with it?
HD-2: A Single-Ended Class-A Headphone Amp | audioXpress

 

[audiowize]

A 6SL7 is a horrendous choice for that design. That's way, way too much gain. They also tend to be microphonic. I suspect with a better choice of driver tubes, you wouldn't need separate B+ supplies for first and second stages.

The DC heater supplies should not be necessary.

The cathode loads on the 6080s will burn up most of the available signal current rather than the load. This is also a poor design choice.

 

[zdenoeddie]

And what about this solution?
Does anybody use 2pcs of 6s19p instead of 6AS7?