Are there any Class A designs which

454Casull · 21st March 2009, 08:29 AM

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 · 21st March 2009, 09:47 AM

Quote:

Originally posted by 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

Yes, just upscale an inductor loaded Zen 7.

Magura

wakibaki · 21st March 2009, 10:20 AM

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 · 21st March 2009, 08:29 PM

Quote:

Originally posted by 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?

Nope. I live in Canada.

wg_ski · 21st March 2009, 09:40 PM

Quote:

Originally posted by 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

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

Zero Feedback Impedance Amplifiers

21st March 2009, 08:29 AM	#1
454Casull diyAudio Member Join Date: Jan 2004 Location: Toronto, ON, Canada	Are there any Class A designs which 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 __________________ Building a 2.1 system out of a 3/4"x4'x8' sheet

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21st March 2009, 10:20 AM	#3
wakibaki Banned Join Date: Jan 2008 Blog Entries: 2	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?

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