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SE 2A3 beta follower : spectrum graph @ 1W , finals biasing

Posted by deathtube 667 on March 27, 2014 at 15:15:46

Here is a spectrum graph of the SE DC 2A3 beta follower circuit I had been listening to for several weeks.

I used a 10:1 passive test probe so the soundcard was not overloaded.

8 ohm/50W power resistor was the test load on the OPT.

Spectrum graph @ 1W RMS.

The 2A3 finals are biased at 43maDC.

This conservative current biasing "concept" seems to reduce headroom and increase distortion measured at the output.

My question : even if you are using high EF horn speakers, will dynamic transients clip the output and cause more unpleasant odd order distortion products?

I read somewhere that a scope should be placed across the OPT secondaries and monitored while music is played at typical listening levels.

The idea is to look for clipping behavior which would indicate lack of sufficient amplifier power to drive the speakers cleanly.

I have not tried the scope idea yet.

Any comments?

Edits: 03/28/14

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