I'm looking to do some tube rolling with my new Cayin A-70t and I'm curious if anyone has any experience doing that. I noticed that there seems to be two models around. One that has a switch to select EL34 or KT88 and one that has the bias pots in place of the switches. I have the one with the bias pots. I'm thinking about trying some SED winged C and some EH 6CA7. What would I set the bias to for use with these tubes. The default is .35-.4
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