2. amps-preamps
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What is the input impedance of the Sugden A21aP power amp?

I have a wonderfully sounding class A power amp, essentially the power section from the revered Sugden A21a (the 90's version). 

But I have been searching wide and far for specs on the input impedance as well as the power output rating on a 4 ohm load (it's 25 wpc into 8 ohm).

Can anyone help? I don't have access to measuring tools.

The reason I want to know is that I would like to match it with my Audio Note M1 tube preamp, which has a high output impedance of between 2,5 and 5 kiloOhms. This translates to a weak bass performance/bass rolloff when playing into the Sugden. With my cheaper transistor preamp, I don't have this issue. 

If I know the specs of the Sugden, I can have my Audio Note dealer modify the M1 with a feedback loop to lower its output impedance to match. 
9radua1

Showing 1 response by 9radua1

9radua1 OP
2 posts
 
Thank you for the advice. 

@kosst, Stereophiles measurements were for the integrated, whereas mine is the poweramp only version. They would have different input impendances, no?

@george, thanks, I will look into that. 
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