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Another Option

The 4P1L certainly looks like a winner from the standpoint of linearity. However, there are considerable references on the 'net regarding its propensity for microphonics. There's even talk about the need to suspend it from a cable, rather then mounting it on a chassis. I don't know the extent to which this issue might surface when it's used as a power amplifier, but I think it's worth checking into before building an amp. There may be colorations that aren't apparent just from the specs (like you always say, right)? :)

Jeff, have you decided against all the usual IDHT pentodes? 6BQ5 curves look pretty good in triode mode. Unfortunately, it's not enough power for my speakers in SE. I know it's not so much of a challenge to use something like this, but there's a ton of info available, lots of opinions from people who have built it, and many variations of the tube available that your friend can plug-n-play to tinker with the sonics. Just something to think about.

6BQ5 Triode





Edits: 09/13/14 09/13/14
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