Thank you for your help, but eserviceinfo.com don't have available the NPS 200 service manual. I looked everywhere on the web without sucess. I only have a copy of tube circuit schematic i found on a old diyaudio threads, but i need the output circuit schematic and instrutions how to adjust the bias and offset of the output circuit.
I'm wiling to pay for this information.
Thanks
Best Regards
Jsmartins