1x 7193+7193 To 6sn7/cv6+cv6 To 6sn7 Vacuum Tube Adapter Socket Converter - Home Theater Amplifiers - AliExpress
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CV6 DET20 Mullard Red Print New Old Stock Valve Tube F19 | eBay
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CV6 7193 half of 6SN7GT | Round black plate this excellent tube, with same characteristic as 6SN7GT x 2tubes packing Original military box with test result sticker on box, tubes... | By