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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.
Follow Ups:
Hi nl,
I agree with you about using two tubes, but maybe (just maybe) 6C45's will surprise me :-). This tube is really unpredictable.My experience with 6C45 is only in amp driver stage, and my strongly recommendation for 6C45 is teflon socket. With teflon socket this tube work very quiet and sounds excellent.
Output toroidal transformer should be next good choice in combo with this tube, because toroidal transformers "want" high capacitive input ie. tubes with high internal capacitance such as 6c45 (or high capacitive power cable for mains toroidal transformers).
Your comment is on my paper. Thank you very much.
best
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