This is an exceptional pair of tubes, which many find to be the holy grail of 6SN7s. These are functionally and sonically identical to the Tung Sol black glass flat plate 6SN7, and usually cheaper (and cooler looking!). Objectively, these are probably the best tubes I've heard in my IHA-1, as they are the most realistic/lifelike tubes I've ever heard. My reason for selling is that I simply prefer the sound of the RCA VT-231 in my system.

Both of these tubes have a slight rattle when moved/shaken, but that's how I received them, so I assume that's normal for them, as it does not affect how they sound. Both of these tubes function perfectly and sound phenomenal. Included with the tubes are a pair of Polish 6F8G to 6SN7 adapters, which are a little nicer than the Chinese ones. Looking to get $300 shipped for the pair of tubes with adapters.