One, new in box, Tung Sol 5U4G tube. This is obviously a vintage, US made Tung Sol tube and not a modern-day Russian made reproduction/re-issue Tung Sol tube. Firm base, excellent silvering. Tube tests at 165-163 where pass/fail is 80. These are relative numbers and do not indicate percentages. Tube has the date code, "322131", the 31st week of 1951.

Many other lots of tubes for sale this week.

Shipping is free within the continental US.  Elsewhere- exact postage only, no packing fee.