Vintage 1950's NOS 12AU7 ultra quiet organ grade tubes

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Vintage 1950's NOS 12AU7 ultra quiet organ grade tubes

Ontario, Toronto

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Description : 17 Aug, 2023

HERE ARE MATCHING HIDDEN TREASURE ALLEN (MADE BY SYLVANIA 1957) 12AU7 VACUUM TUBES. THESE WERE PULLED FROM A 1959 ALLEN ORGAN TONE GENERATOR. THEY ALL TEST FROM 96% - 100% FOR EMISSION ON BOTH TRIODES WITH NO SHORTS OR GRID LEAKAGE. TESTED ON A B&K 747 TESTER. THESE TUBES WERE SUPPLIED TO ALLEN ORGAN BUY SYLVANIA TO MEET THERE LOW NOISE AND MICROPHONIC SPECIFICATIONS. DATE CODE ON ALL TUBES IS 926. SYLVANIA CODE ON TUBES VBT OR VBS. THEY HAVE LARGE GREY PLATES AND TOP MOUNTED BENT RECTANGULAR GETTER. THESE ARE EXCELLENT LOW NOISE 12AU7 TUBES. GREAT FOR TUBE AUDIO APPLICATION. DON'T MISS THESE!!! from $90.00/matched pair 1957 - 59 Allen PN-11's or 12AU7's. All of these tubes are now uber rare all original Allen PN-11's, which are Allen's private label for a 12AU7. The printing on the tubes is yellowish-Gold, which was a Sylvannia screenprint color at the time. These are vintage 1950's organ grade ultra-low noise 12AU7 tubes. It is a silver top, with "D" getter on top Allen Organ PN-11 12AU7 tubes. In the 1950's, when Allen manufactured tube organs they would quality check every single tube that went into their tone cabinets. This kept sound problems (like microphonics) to a minimum. Allen used re-branded Sylvania 12AU7 organ grade ultr-low noise tubes. Once approved for use, the tube tip was marked as was the practice of all low noise tubes then. By the mid-1960s Allen was pretty much out of the analog tone cabinet business. They still offered PN-11 12AU7 organ grade tubes to their installed base, but they were strictly re-branded Sylvanias, without any further testing. Allen ascended to e the top of the electric organ heap during the golden age of tube powered electric organs (~ 1957 to ~1964) Until the early 50's most Allen Organ amplifiers were purchased from Webster (Webcor). As Allen went upscale they began to pressure suppliers to incorporate better ponents, then required private labeling ("Allen"-labelled amps), and ultimately brought manufacturing in-house. By that time (1957), Allen became one of the biggest buyers of tube-related gear in the world. They got the best tubes from whatever supplier got their primary contract (usually reviewed annually). They purchased so many 12AU7 tubes and were so picky regarding microphonics that for a time they had their own tube designation, such as Baldwin, Hammond, Philips Electrohome all produced low micorphonic noise organ grade tube production (from 1958 - 1966) from $90.00/matched pair

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