Tube DIY Asylum: one tube is better by nl Do It Yourself (DIY) paradise for tube and SET project builders.

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Posted by nl (A ) on March 13, 2003 at 17:24:03

In Reply to: Power amplifier with ONE tube posted by RM on March 10, 2003 at 14:49:13:

Using two tubes seems like it defeats the purpose of having a one tube amp, if you ask me. You're only getting 3db more output, and if that makes a difference, you need about 10db more headroom anyway, which means new speakers.

Another solution is simply to drive the tube harder. Mine goes at 235V and 35mA, or about 1.5W. Maybe this will wear the tube out faster, but I've never heard of anyone actually burning one out. They seem to be very durable.

My amp runs directly from a DIY DAC that takes output directly from the DAC ICs with no gain stage. (tnt-audio Convertus type circuit.) So there's only one tube between DAC IC and speakers. However, most of the time a 1:4 stepup is necessary, which is not really ideal.

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