yes - i tried it with both tesla e34l's and svetlana el34,s. i got cherry red tubes using the bias meter settings and i had no way to check plate voltage and try to bias in at a setting appropriate to and el34. i went back to 6L6's. if you're looking to smooth out the high end, look into a mod of the cap's. i had a factory mod to wima caps and it helped a lot. that and some new driver tubes really civilized it. i'm not aware of what other caps are available which could be used in place of the wima but i understand there are better caps around.
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