All tubes are tested on a professionally calibrated Triplett 3444.
RCA JAN 5814A - $39/pair Free Shipping These tubes were purchased from Andy Bouwman at Vintage Tube Services, who is arguably the best tube seller in the USA. Andy tests for microphonics and then grades the tubes on a color system. Blue (the color of the paint on these tubes) signifies lowest tested microphonics and suitability for Moving Coil Phono Preamps. They are the best-of-the-best. Tube #1: 7ma @ 2500gm and 8ma @ 2800gm = 81/90%
Date Code 65-48= 1965 48th week Tube #2 8ma @ 2800gm and 8.8ma @ 3000gm = 90/97%
Date Code 64-48 = 1964 48th week No Microphonics. No Gas. No Shorts.
3100gm is the standard for a new 5814Atube, and 2000gm is the replace number on a Triplett 3444.
5 Day Return Policy - I endeavor to thoroughly test your tubes before shipment to ensure that I represent them accurately. If they do not perform as expected in your system - microphonics or noise for example, then you may return them for a full refund. Buyer pays return insured shipping. The 5 Day Return is not intended to provide a Buy-Try-And-Return method by which a Buyer can "tube roll" and return them if they do not produce a subjectively pleasing result. Paypal or USPS Money Order
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