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RE: 6SL7 Tube Recommendations for Aretha Preamp

Octal 6SL7 is very close to 9 pin mini 5751. μ = 70. Good OS 6SL7s are NOT easy to come by. The RCA tubes you have easily could be outstanding.

A possibility is building/buying Loktal to Octal adapters and using Loktal 7F7s, which are electrically equivalent to 6SL7s. You can count on Sylvania using the same "cages" in both 6SL7s and 7N7s. They were in business to turn a profit. ;>)


Eli D.


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