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Old 8th November 2012, 05:45 PM   #1
Mr. dB is offline Mr. dB  United States
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Default Gain Structure?

Let's say my source is a Pearl II phono preamp or a typical dac (or even an FM tuner), and my power amp is a BA-3, will I need a line stage with gain or will a unity gain buffer do?
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Old 9th November 2012, 02:05 AM   #2
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Hi Mr. dB

I think you might need to re-read Nels's PDF's again.

The BA-3 is essentialy, a line-stage, with ( I think ) 30dB gain.
A nice power-amp to go with this, could be any 'follower type' amplifier.
Check the BA-1 & BA-2 ( and some of Nels's 'F' amps ( I think )).

You would need to have some kind of 'volume control' in front of the BA-3.
This could be 'buffered'...
...but I think the BA-3 would be fairly happy, with just a 'passive preamp' in front of it ( ie. just an attenuator or 'pot', perhaps with some input sockets & switch ).

Not sure how much 'juice' you get out of a 'pearl'.
One of Nels's B1 buffers could be good as well.

So...
...re-read the PDF.
I think the BA-3 looks like an EXELLENT line-stage/amp-driver...
...I'm thinking to make one !

Good luck.

Cheers.

Si.
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Old 9th November 2012, 09:09 PM   #3
flg is offline flg  United States
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I think "BA-3" is a front end for either the BA-1 output stage or the BA-2 output stage creating the BA-3 Power Amp!
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