Has anyone actually replaced the 5687 tubes in the Power 2 & 3 with 6900 tubes? I need to know if any modification was used or was it a drop in replacement.
On the output tubes, what tubes have you tried other than 6550 or KT88? (your observations)
~~~~Update. Have been using 6900's now for 3 mos. Must keep checking bias on output tubes as 6900's warm up and burn in. They take 5 minutes or so to fully warm up. Took few hours to burn in and stabilize. Nice improvement in sound.
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