Bias for Jadis DA-8

Any information on the bias value for the 6550s in my Jadis DA8 will be greatly appreciated. I have emailed Jadis and they said that they cannot provide this information. I have to go thru the local distributor for servicing. Unfortunately, we do not have a local distributor. I explained this but never got a response. Needless to say, I got this amp from overseas.

Thanks in advance.