RCA 5963 Tubes Black Plates D Getter Lot of 6

Tubes are used. Tubes tested on Amplitrex AT1000 in (Fixed Bias Setting). Test result on sticker in the GM %. The GM baseline for new tube is 100%. Good quality tube reading is 80% to 100%. Tubes stronger than the baseline will have reading over 100%. Will combine shipping with other items I have li sted on eBay