About 4 months ago I ordered a random pair of 6P15Ps from Amazon for no particular reason other than they were cheap enough to take a chance on. After 2 months, they hadn't been delivered so Amazon sent me a message asking if I wanted to cancel my order, which I did. Then yesterday they showed up at my house, even though I'd received a refund. Anyway, I've been listening to them all day, and they are by far the best sounding 6P15Ps I've heard in my Zen.
I'm used to the common Russian 6P15P-EV with the diamond symbol that are so ubiquitous, but these don't have any symbols, just "6P15P" with "84110" beneath (actually, the "0" is a circle with a line through it"). They came in bubble-wrap sleeves but no tube box. I know they're Russian and came from a seller called Miura Electro-Commodity in Japan. Unfortunately, they are no longer available on Amazon, and the seller doesn't seem to have their own site.
I'd love to buy more of these and have checked all the usual online tube sellers as well as ebay, but can't find any others that match. Has anyone come across these particular 6P15Ps before or know where I can buy some more? They are incredible.
These tubes give my little Zen the excitement and presence of my Torii Jr, while retaining all the attributes that make the Zen great but are diminished in the Torii Jr (dimensionality, depth, realness of tone, etc.). And holy moly the frequency response -- they go high and they go low! I can't go back to the diamond 6P15Ps again!
Here's a pic: