Here is a great pair of tested 12BY7A's . These were marked as Selected by Tektronix and has their serial number on them. Further we properly tested them on our calibrated TV-7D/U where minimum =46, Both tubes tested at 70. The box is a little beat up, see the photos, the tubes are nice. This listing is for the pair (2) of tubes. You get both Tubes. "SL" Date code December 1977 Buy with confidence. We are very proud of our 100% positive feedback. Please read it. We stock over 3,000,000 tubes. If you need something, please message us and we will send you an offer. Your tube(s) will be properly packaged to insure they get to you in good shape. Serving collectors and the trade since 1978 If you are looking to re-tube any kind of tube gear such as CB Radios, Ham Radios, Linear Amplifiers, HI -FI amplifiers, Guitar amplifiers, Preamplifiers, Compressors, Equalizers, Microphones, Industrial or Medical equipment, you can send us the make & model number and we will try and help you. We mainly stock Domestic brands such as RCA, GE (General Electric), Sylvania, Raytheon, TungSol and PentaLabs. We stock some We also carry european brands such as Amperex, Mullard, Telefunken and Marconi.
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