How to bias Sonic Frontiers Line 2?


I'm planning of changing the six tubes in my SF Line 2 preamp but the manual doesn't say anything about biasing.
Does anybody know if this kind of preamp needs biasing or is it auto bias? BTW I'm using the balance input and output.
Thanks in advance.
royy
royy
Well, I checked the schematic for the Line2 and what has been suggested balances the bias between the two sides of the 2nd 6922 (voltage amplifier stage) in order to help insure balance between the two phases of the balanced output. There is no way to adjust bias directly nor any adjustment for either the input 6922 or the driver 6922.
You can still get schematice from Anthem (Sonic Frontiers) for $25 the last time that I checked. Just e-mail them and they'll get back to you.