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In Reply to: RE: Are octal 6SL7 more fragile than 12AX7? posted by andy evans on February 13, 2016 at 00:24:05
In my experience, I've had octal front end tubes get noisy or microphonic a bit easier than their 9-pin mini counterparts. Esp high mu ones, like 6SL7GT.
Follow Ups:
I think that long plated tube are more susceptible to microphony.
I collect 6SN7s, with the earliest incarnations (the GTs, Ws and As) are notoriously microphonic . I found out that my collection had many microphonic tubes that weren't picked up/heard as the driver in an integrated tube amp I was rolling these tubes in. It was only apparen't when I got an AES AE-3 preamp with the 6SN7s playing a crucial role in the amplification circuit.
As it turned out several of these tubes sounded great despite the microphony. If the microphonics are only heard when tapping the tubes, it seemed to work well. I know I and some other people think that it actually gives the sound a little more depth and sound stages a bit better. All I am sure of is that unless it is so bad that it causes a feedback loop, and you don't play drums on your tubes while playing music, they work fine with IMHO. The bad side of course that I can't sell them off without noting this.
That's my experience.
8^)
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