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Seller Store igolioto
(17071) 100.0%,
Location: Whippany, New Jersey, United States
Ships to: US,
Item: 286089393082
Condition:New
RCA:RCA
Type:NOS Tube
5691:5691
Country of Manufacture:United States
MPN:5691
Country/Region of Manufacture:United States
eBay Two, new in box, Dumont branded, RCA made 5691 tubes, the long life/high reliability 6SL7GT. These are branded GE, but were made by RCA. The 5691 and 5692 tube designs were both initiated by RCA. The 5692 had two distinct designs, one from RCA and a later one by CBS/Hytron-Sylvania. Other manufacturers offered the 5692 for sale, such as GE, Westinghouse, Raytheon, etc…but were made by one of these two concerns. The 5691 tube though, was not made by any other manufacturers, though it was rebranded by the same, forementioned, other manufacturers as well. This RCA made tube has the red base, the flat (no sheen) black plates, unique mica design, and the octagon enveloped 5691 designation on the side of the bulb. In this case, Dumont was simply a tube re-brander- by the date these were branded, they were no longer the pioneering television manufacturer. Red micanol bases, black plates, reinforcing rods. The 5691 is of course the ruggedized, low microphonics, low noise, high reliability, long-life version of the 6SL7GT tube and can be used in applications calling for the 6SL7GT. Tested on a Hickok TV-3 military tester that has been calibrated, just to make sure. Firm bases, excellent silvering. Tubes are matched for dynamic gain and structure- test at 1750-1625, 1750-1625 where pass/fail is 1100 micromho. Tubes have the same exact structure inside and out, having date codes of “67-16”, branded in the 16th week of 1967. I believe that the tubes were likely manufactured by RCA in the late 1950’s, as the 5691 designation on the side of the bulbs, color and texture of the etch was not done this manner after 1958. Many other lots of tubes for sale this week. Shipping is free within the continental US. Elsewhere- exact postage only, no packing fee.
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