meomap
Headphoneus Supremus

I decided to go with this instead of yours.Have these on their way, a bit of an impulse purchase from Upscale Audio to use in my Feliks Elise.. All Upscale notes is that they are early Russian, found in a cave in Brazil, intriguing but not very specific. Can anyone help me ID their make / year of production?
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Changed my mind at last moment.
Ordered one tube for my ALO Studio Six.
Will use it with Utopia and AFC.
Hope, it's worth it.
The amp designer said only worthy upgrade section of tubes in this amp are 6SN7 and 6V6 section.
