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In Reply to: RE: Are There Any Issues Using 12au7 in Place of 12ax7s? posted by jaydacus on April 01, 2016 at 16:34:08
Further, all 12AU7s are high-distortion when used in a gain stage. (Unless a lot of NFB is used.)So you will have be listening to quite high distortion.
I recall that you used 12AT7s in place of 12AU7s in the VTA ST120, I for one am not at all surprised that you didn't like them. The circuit isn't designed for them. Of course they sounded wrong.
Why do you imagine changing tube types - as against changing brands - would be an improvement?
Do you have any understanding of audio reproduction circuits or are you just trying for effects - as in a stage/PA amplifier?
Warmest
Tim Bailey
Skeptical Measurer & Audio Scrounger
Edits: 04/02/16 04/02/16 04/05/16 04/05/16 04/05/16Follow Ups:
The VTA ST120 was originally designed to take the 12at7. I later modified the driver board by changing out certain resistors at per instructions I received to take the 12au7 instead for lower gain.
I ended up switching my Chi-Fi amp back to the 12ax7s due to negative effects on distortion levels and the overall flatness of the sound. Will find some vintage 12ax7s eventually. Thanks for all of your input. `
The Tung-Sol 12ax7 is a really nice tube.....
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