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Post subject: 12AY7's in a Blues Deville
Posted: Fri Oct 23, 2009 3:36 pm
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I have been wanting to change my preamp tubes in the V1 and V2 slot to 12AY7's. But, i've heard from a couple of different sources that it could damage my amplifier. Anyone know if this is true?


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Posted: Fri Oct 23, 2009 11:19 pm
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CJ, the 12AY7 should be fine in the V1 & V2 position. I like 5751's also to scrub off a little gain and add some tactile depth. I'm interested in the specific reasons the 12AY7 could harm the amp. Can you post the sources? The only difference besides the gain factor is the output current 3ma vs. 1.2ma. The 5751's are the same as the 12AX7, 1.2ma. Maybe the concern has to do with the transistors in the following circuits. ART

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Posted: Mon Oct 26, 2009 9:12 am
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12ax7, 12at7, 12au7, 12ay7, 5751 all similar tube just provide different gain level.
Going too low can make the amp sound like doodoo, but should not harm it.

I use the 5751 in v1, 12ax7 in v2 and 12at7 in v3

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