I suggest you contact tubeman. He is very knowledgeable. Find him on the web
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For deep bass, linearity and clarity consider the SED 6550's. In my PL3/5 combo I preferred them over SED KT88's (I agree with your description). Also, don't forget to fiddle with the small tubes - A small tube with a bright balance won't help you with the SED KT88's nor the 6550's for that matter. FWIW.
Than you for the responses so far.
Newbee:I have rolled the AX/AU combo with the Shuguang triple mica 12ax7 and Radio Clef cryo'd 12au7s.A very big improvement as the stock tubes (ax/au) lent the unit a very clinical/lean character.I wish to stay with the ** instead 0f the 6550.The 6550 would provide more heft and body in the midbass/bass,but not have the sweetness and delicacy up-top.
Eddaytona:Kevin/Upscale offers the Chinese Genelex and the SFD.If the "desired" Genelex run too deep into my pocket,the "chinese" are preferrable to the Russian in my book.
Maybe I should have labeled my question differently,as I have not gotten a reply from anyone using "original" Genelex Gold Lion (US distributed) or Gold Monarch( European distributed) KT-88s.