This is a nice used GE 5691. Red Base No Original Box, TIght Base, Clean Pins, No Gas or Shorts Properly tested on our Calibrated TV-7D/U, The Gold Standard where Minimum NOS = 31 T1= 57 T2 =58 Well balanced. The vintage redbase is a very good, very rare dual triode. Rugged 4 support posts, 10,000 hr. life, low microphonics. "HE" April 1971 date code KY GE plant 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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