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In Reply to: 6SL7 Tube Recommendations for Aretha Preamp posted by escape2cfc on September 13, 2021 at 20:57:56:
RCA 5691 are highly regarded by some. Not to be a wet blanket, but I have found them to be rather unremarkable, and not as clear sounding as many other makes/variants. They're constructed like the Swedish Standard 33S29B, which is another very rare and expensive 6SL7GT type that I find ho-hum. But you have the 5691 already, so give it a try.
I tend to favor tubes that allow sonic detail to emerge. There are many others to try, and some gems from the less expensive end of the pool including:
Ken-Rad (USA) nickel-plate or black-plate 6SL7GT
Rogers/Majestic (Canada) 6SL7GT
CBS (USA) long gray-plate/black-glass 6SL7GT
CBS (USA) gray rounded-plate 6SL7GT
I confess that some of my favorites are hard to come by, and are very expensive:
Valvo (Hamburg Germany) 6SL7GT look similar to Ken-Rad
Valvo (Hamburg Germany) '50s ECC35
Mullard (Blackburn UK) '60s ECC35
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Follow Ups
- RE: 6SL7 Tube Recommendations for Aretha Preamp - opalize 11:24:36 09/15/21 (0)