A little late to the party... but I'm running Tung-Sol 6550's in mine with fantastic results. Tung-Sol 12AX7's and the stock 12AU7EH's.
Cayin A-70t tube rolling ...EL34 Tubes?...
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