6th Street Bridge: Tube Review: The Reflektor 6P3S-E power tetrode and the Sovtek 5881
2 PCS 6P3S-E (6П3С-Е, 5881,6L6GC) NEW REFLECTOR TESTED OTK SAME DATE 88/05 | eBay
David Pile on Twitter: "Soviet military 6P3S-E tubes on my home-made amp glow blue at glass surface. Causes here: https://t.co/48H1XXXetw https://t.co/YDQp6jrLh2" / Twitter
Russian 6P3S-(E) / 6n3C-(E)
6P3S-E DIY Single Ended amplifier | Do-it-yourself enjoyment