Sylvania 6ca7 biasing question.

[4styx]

Does anyone know the exact power rating of these tubes or suggested MAs?The old big bottle ones. Thanx

[phsyconoodler]

I can't find any data on the Sylvania.Other 6CA7's of the period were 25 watts max plate dissipation,same as most EL43's.
I have a pair of NOS Sylvania 6CA7's too,and I bias them at anywhere from 35-40ma at 430v.They sound pretty awesome.Better than any new production EL34 I've used to date.
I would probably go easy on the current and see if you like the tone.

[SatelliteAmps]

The Sylvania's weren't rated at anything different than other 6CA7's.