You are bidding for 1 pair ( 2 piece ) huge RS285j tubes made by Telefunken. This type is similar to better known 851 tube.

 Tubes were tested from 1kV laboratory PSU.

1 tube)

400V plate, minus 2.9V on the grid – 127mA current

800V / -20V / 126mA

800V / -30V / 32mA

999V / -30V / 108mA

2 tube)

400V / -3.1V / 128mA

800V / -20V / 130mA

800V / -30V / 35mA

999V / -30V / 113mA

Looks fine working tubes. Almost matched pair. Great for cost on object project.

One tube has output terminals in weak condition, but this not effecting to performance. Check actual photos for details.

 Private selling. I’ll prepare good package and post worldwide, but will not assuming responsibility for tube damage during postage due age and gently specific. Payment should be done within 3 days. Bid accordingly with posted above. Contact seller for any questions. Check my other power tube auctions. Happy bidding. Don't loose opportunity.