ARC Ref150 upgraded to KT150 bias?

[Pacha]

I've just upgraded my ARC Ref150 amplifier to KT150 tubes from the stock KT120s. The manual states adjust bias to 65mVDC for the KT120 tubes. My question is what should I set the bias to for the new KT150s? Any suggestions greatly appreciated.

 

[Argonaut]

I would recommend staying with 65mVDC

 

[Pacha]

I would recommend staying with 65mVDC

That was my first guess also. Thank you for the reply.

 

[Pacha]

Just heard from ARC, and their answer is the same. Stay with 65mVDC.