- Jun 16, 2015
Yes they have decent curves, they'll probably do pretty well. Sims (with all the caveats that sims have) seem to indicate EL12 is almost as good as EL81 and EL36 in this circuit. In real life it could be indistinguishable, or then again not.
I would not recommend doing a 'workhorse' amp with those tubes though. I've dealt with old stock US and European tubes quite a lot, and while many are sold as "NOS" or "tests 100%" or whatever, the lifespan they have left could be anything from 1 week to 10 years. I would not deal with that risk on an amp I use every day.
You're right. A workhorse amp should not rely on 3 pairs of NOS EL12 spez. I'll keep them to admire them... on the wall.