Tube DIY Asylum: Re: One stage is (not) enough. by Damir Do It Yourself (DIY) paradise for tube and SET project builders.

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Posted by Damir on November 18, 2003 at 06:33:50

In Reply to: One stage is not enough. posted by Joelt on November 17, 2003 at 19:01:02:

In my experience - the more stages you cascade - the sound is worse.
And the driver stage swing/distortion - see, for example, distortion tests by Pete Millett (a few months ago), or tests by Morgan Jones in "Valve amplifiers"-3rd edition. The "ordinary" 7N7 (one section) with active load have k2= -52 dB and k3= -85 dB with Uout=19,5 Vrms. With 2Vrms in and 39 Vrms out you can expect, say, 6 dB worse distortion (but still acceptable). And this is enough (32 Vrms or 45 Vp) to drive the 2A3 to full output.

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