New old stock pair RCA 12BF6 tubes, close matched pair. appear to be dated 1958...tested (pictured under test) at very much over new. Tested on my AVO Mark 4. For reference, the AVO actually applies 250-450 plate volts and tests tubes under power unlike other testers. You can then accurately test for shorts, gas, etc. Well Known that tubes can warp and deform when hot/under full voltage...AVO's will pick this up where others will not. Reference for new 12BF6 per avo manual is IA/MA =  9.5, and Ma/V is 1.9. Tubes tested at:

Ia/Ma= 15 and 16

mA/V= 2.3 and 1.8

No shorts, gas, insulation issues, or runaway draw.  Will be sent in RCA original boxes....

Ask questions before bidding as sales are final and as is. I expect winner to contact me within 24 hours and have payment here in 7 days,,,,,do not bid if you don't intend to follow through.  I pack well and ship promptly.  I do ship international, but buyer pays duties and fees.  I don't lie on customs forms. Continental us estimated...Hawaii and Alaska are more, please ask.