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RE: tube taster

"The switch arrangement satisfies most of your requirements except for volume. "

That's not a minor point Ray. Failure to level the outputs prior to switching between them invalidates the experiment. I was involved in extensive double-blind A/B tests of SS amplifiers in the '70s and '80s. Higher-gain amplifiers must be padded down to eliminate this difference. Results become virtually nonsensical otherwise, with multiple listeners more frequently reaching different conclusions. That aside, I do think use of phones for these types of tests is more appropriate than speakers, particularly when vacuum tube power amps are involved. It's too easy otherwise to be fooled by variations caused by the tube/speaker interface.


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Follow Ups Full Thread
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  • RE: tube taster - Triode_Kingdom 09:14:47 07/09/17 (0)

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