Soviet era Sovtek 6H30P Supertubes Matched Quad June 1986 dates

Selling some of my tube stash, these are super rare. This matched quad of 6H30P tubes were manufactured in the Reflektor plant and are all 4 dated coded 8606 which means they were made in June, 1986. How rare are they? Well, I searched high and low 15 years ago and these were expensive then!! Bought them when I owned BAT equipment and while they were rolled in for maybe 100 hours, I sold the BAT equipment and never returned.  This is the tube that started the "Supertube" legend. These sell for $4-500 each when you can find them new and since these have technically been placed into some equipment, unlike many sellers out there, this makes them pre-owned. I am selling them just because I don't anticipate using them and want to redeploy the funds into some other gear.
I have priced these to sell and they will ship USPS priority mail insured with a signature for a flat fee of $30 which also will cover the paypal fees. See my feedback and buy with confidence. Thanks for looking.