@harley52
Deleted prior post linking to the Q&A section the QS site. Update: Found more updated manual information on the newer Silver 88 monos, which coincides more closely to your Silver 70s with KT88 tubes. The Silver88 manual shows 40ma per KT88 tube on Silver 88s amps. Another reference when you email mike at QS.
http://quicksilveraudio.com/wp-content/uploads/2017/11/Silver-88-instr-for-web-.pdf
Deleted prior post linking to the Q&A section the QS site. Update: Found more updated manual information on the newer Silver 88 monos, which coincides more closely to your Silver 70s with KT88 tubes. The Silver88 manual shows 40ma per KT88 tube on Silver 88s amps. Another reference when you email mike at QS.
http://quicksilveraudio.com/wp-content/uploads/2017/11/Silver-88-instr-for-web-.pdf