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RE: Thank You

Posted by Freo-1 (A) on November 29, 2015 at 05:50:15

In Reply to: RE: Thank You posted by Triode_Kingdom on November 28, 2015 at 21:52:03:

I'm saying that a quick and dirty check after re-wiring the filament supply, and following that with listening tests quickly confirmed what was very obvious. The sound from the speakers was noticeably improved across the board. Low level detail was significantly improved, and loud dynamics were much more open, without compression.

Dave_Slage's measurements confirms that the 6BL7 CAN be as low or lower distortion than the 6/12SN7.

The reason that my application is/seems to be working better is that both my power amps are pentode, with separate screen supply/regulation. One set of amps is driving a quad of 1625 tubes, while the other set is driving a pair of 6883B tubes. The topology is (possibly) quite different from what you normally employ. I'm pretty sure the 6BL7 is driving the power tubes in a more efficient manner. My chosen speakers are ATC SCM19's (with a external outboard crossover). While they have some of the best drivers on the market, they need watts to sound their best. Ergo, high powered pentode amps.
" Don't look back. Something may be gaining on you"

Satchel Paige

Edits: 11/29/15 11/29/15

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