These are the Vintage “No Hole” USA made 6550’s that are earlier production than the 3 hole. I sold my Nautilus so these are up for sale. These were purchased NOS from Brent Jesse (See pictures for test on boxes.) 8 months ago in April. I’ve used these off and on over the last 6 months since I had other amps I listened to as well. these don’t have tons of hours of use on them.
Currently sold out from Brent and sell Nos at $400-450. I bought a lot of tubes in the last year and these were the best I found in the A&S amps. Silent with no apparent microphonics.
Selling these for $300 shipped. Worth every penny!
