NOS RCA 5691 Red Base Tube selected for Raytheon Premium Uniline Brand in original box as shown.
Tests 1620/1660 where 1000 is good at 250 volts in a Triplett 3444/Westmore 501 laboratory tube analyzer restored and upgraded by Paul Hart.
Listening tested for excessive noise & microphonics in a Maxi-preamp 2 tester.
All tubes are guaranteed to test good or may be returned.
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