Are there any Class A designs which

[454Casull]

have a very high output impedance, no or little negative feedback, and can output ~50W per channel? If not, is it possible to design such an amp?

Thanks,

Howard

 

[Magura]

have a very high output impedance, no or little negative feedback, and can output ~50W per channel? If not, is it possible to design such an amp?

Thanks,

Howard

Yes, just upscale an inductor loaded Zen 7.



Magura

 

[wakibaki]

If you call valve amp OP stage impedance 'very high' then you can take any amplifier outputting 50W into 8 ohms and give it a high output impedance by feeding it into a reversed OP tx. If it was a class A amp with little or no negative feedback that would satisfy your conditions, n'est ce pas?

w

Have you actually got one of those hand cannons?

 

[454Casull]

If you call valve amp OP stage impedance 'very high' then you can take any amplifier outputting 50W into 8 ohms and give it a high output impedance by feeding it into a reversed OP tx. If it was a class A amp with little or no negative feedback that would satisfy your conditions, n'est ce pas?

w

Have you actually got one of those hand cannons?

Nope. I live in Canada.

 

[wg_ski]

have a very high output impedance, no or little negative feedback, and can output ~50W per channel? If not, is it possible to design such an amp?

Thanks,

Howard

This sounds like what you want. You just need more bias and more cowbell, er, hexfet.

http://www.diyaudio.com/forums/showthread.php?s=&threadid=42259