to all out there the 6h30 is now so much in demand that
ELectroharmonix -which is indeed a part of Sovtek
a little better quality control I am told. To get the most out of the tubes here is a little tweak I found and this applys to all connectors ,1st go to cvs or any drug store get 90% alcohol clean all connectors and pins , Furetech sells Nanafluid which is pure gold particles this fills in all the fractures in the pores of the metal it makes anything that comes in contact a far superior contact,for in a sub atomic level there is electrical arching,this stops this .
the tubes now sound like a good vintage or DRs and a bottle comes less than 1/2 full is $125 but well worth the effort the best on the market I have tried every top brand out there this is a permanent fix !!