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In Reply to: RE: Vintage 6922 Recommendations for DAC/DAP Output Tubes posted by Fullrun on July 02, 2012 at 16:11:58
Telefunken 6922's would be my recco. The Siemens have great frequency extension at both ends of the spectrum, but at the cost of some mid-range. I would not go so far as to say the Siemens have a scooped out sound, but they lack just that bit of flesh in the mids that the Tele's retain. The Tele's have 98% of the frequency extension of the Siemens, but they have a mid-range that makes for a more believable and satisfying presentation IMO. I suspect that you'd be happy with either tube, but maybe just a little bit more happy with the Tele's.
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the circuit is setup. The operating points can bring the mids if the Siemens is worked with. I have found this to be true of many tubes. The Sylvania, not to get off topic, 1929 to 1931 27 mesh plate sound the best if near its max operating points and the RCA 76 needs to be right at its max and it outshines all other 76 types. Realizing that not everyone is going to tweak their system, to me, it is the only way to get the most out of each tube and isn't all that hard.
The Elaborate DAC=Johnny's Balloon Meshplate 27 Balanced Preamp=Balanced Six Pacs=Newform Research 645
iRiver H140/MB Balanced dac/amp/Ultrasone Ed. 9/JH13 Pro IEM's
see images at: www.pbase.com/jamato8
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