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Putting tube rolling in perspective

Posted by jb0194 on February 8, 2007 at 17:47:37

In Reply to: addendum posted by Lew on February 8, 2007 at 06:30:03:

I agree, Lew.

Ralph's power regulators in both my MP-3 and M-60s were quite audible upgrades, as were V-caps in both.

As for tubes, the differences, to my ears, have been very subtle. Nonetheless, I do hear differences that justify my tube rolling.

For me, the MP-3 lineup is:

Chinese military 6N8P-J ("A-matched" from DIY HiFi Supply) and either RCA blackplate 12AU7 or TungSol 5814;

In the M-60s:

V1 = Sylvania 1952 6SN7GT (yep, the bad boys - I tried not to like them due to cost, but...) or KenRad clear glass 6SN7GT (essentially the same naturalness, but about half or less the cost)

V2 = bypassed

V3 = Chinese military 6N8P-J ("A-matched" from DIY HiFi Supply)

V4 = Soviet 1970s vintage 6H8C made at Moscow Electrolamp factory (the ones with "1578" inked on the bottles); another pricey tube, but a guy from the Ukraine auctions pairs on Ebay with a very low start price. The 1980s tubes from the same plant have dull (not shiny) plates and lack the "1578" stamp as well as the sonic virtues of the original.

jb

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