Lon
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"Love without guts is worthless!" Philip K. Dick
Posts: 25756
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Tony, I have done a ton of rolling the driver tubes on my SEWE300B, which are 6922 or 6N6P as designed by Steve, but I have found the best sound by using 6SN7 with converter bases that convert the 6SN7 to work in the 6922 positions. (The tubes in the SEWE300B are: a 12AU7 in the input position--I'm using a 7062 at the moment--three regulation tubes that are either 0A2, 0B2 or 0C2--I'm using a 75C1 which is a small tube version of the 0C2 in all three positions--and the driver tubes for the 300B, one for each channel, which is where I am now using 6SN7 tubes with converter bases to 6922 tube electrical characteristics, and then of course a 5U4G etc. type rectifier and the 300B tubes themselves.)
For about 6 weeks I have been using my favorite old RCA gray glass 6SN7 and decided (with the changes that the Swiss Digital Fuse Boxes have been making in the system) to roll some other 6SN7 that I have on hand from years ago. There is a pair of GE that make great bass. . . but harsher high frequencies. . . and a pair of newer RCA that are pretty good, and a pair of Tung-Sol that aren't too exciting. . . and I ended up just putting back the old gray glass RCA 6SN7s and satisfying myself that I like these best.
When I first got the amp I ran through all the 6922, 7308, 6DJ8, 6N6P etc. on hand. It's hard to make the SEWE300B sound bad with any tube substitutions, but there is something very "old-fashioned" in a good way about the 6SN7 used with converter bases in this spot, and I'm going to carry on with that setup.
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HR-1,ZBIT,ZROCK3,SEWE300B,CSP3-25mod; Rega RP3 all GrooveTracer mods;PSAudio:PST+DSD, DAC Mk II, P15,NPC,PowerBases,AC-12 pwr cbls, Reference spkrcbls; Mapleshade SamsonV3; VooDoo:Cremona+Amati interconnects;Stack EQ; headphones: Sennheiser HD800S,ZMF Ori,Oppo PM1
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