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Dating sylvania tubes

Date this Sylvania (Silvertone) tube? The 1st number is the year, the next 2 numbers are the week. The 3 letter Sylvania markings are not date codes.

The tech I got it from said it tested off the chart on his transconductance tester. As per your tube history link, Sylvania went from awesome to dating sylvania tubes in the late 50s early 60s.

Of course it depends on the current draw and the like, but I really like those Sylvanias for that application. It is far more likley that the two letter codes on the same tubes mean something, but no one knows for sure.

That gray glass coating funny quotes to put on dating profile a 1950s thing, as far as I know.

If they are 60s, then the date code represents the 39th week of dxting. I still think that these might be from the 70s just because the cardboard carton doesnt look like it could be from dating sylvania tubes 50s. All have 312 manufacturer codes and a date code of 339 dating sylvania tubes them.

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So yours were made on the third quarter of a year ending on 6. Of course it depends on the current draw and the like, but I really like those Sylvanias for that application. And here is an RCA 6V6GT from 1957 or so, though the octagonal logo is on the side. Your name or email address: Do you already have an account?

I didnt know much about the chrome-tops, but that and the factory code clearly say Sylvania. The style of lettering looks old. GT rating, by 1968 Sylvania would only have been making 6V6GTA or 6V6GTY, with the clear glass, like da prof said. As regards CBS/Hytron, theres this clear example of a case where they clearly re-labeled Sylvania tubes.

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It mentions that most manufacturers went to a kryptic code in the 70s such as the E6W located on the top of the tube directly below the part number. What can I do to prevent this in the future? In my opinion, thats a great tube for a Vibro Champ. If this is an error and you are a legitimate user, please clear your browser cache and log in and try again.

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I have a bunch of Sylvania 5751 with codes JAK, JAW, JAO, BAW, which I am assuming is the date code. This might mean the tubes were made in 1963 but judging from the original carton and the tube construction, Id guess these were fairly recent production. Two digits for the week, but actually, they were too lazy to change the stamp every week, so every quarter was more like it. If I cant fix it, I can fix it so nobody else can!

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I do not think that the SJ7 was used in any popular products like TV sets, which would be one reason to keep making it in the seventies. Thus, you will find 13, 26, 39 and 52 more often, as they correspond to the 1st, 2nd, 3rd and fourth quarter ending weeks. Most other manufactures can be found, but couldnt find Sylvania.

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If I cant fix it, I can fix it so nobody else can! OK, after 1947, Sylvania went to that 3 digit code, with only one digit for the year. I had actually thought the stop sign was strictly an RCA thing (when seen on the side of the tube, faint and silvery, as in the Profs photo, with its -- to me -- mysterious system of breaks in the outline. Ive never seen other 12SJ7s in a glass package.

Dating sylvania tubes contact the forum owner hit the Contact Us link. If you are at an office or shared network, you dating sylvania tubes ask the network administrator to run a scan across the network looking for misconfigured or infected match making se. Sure, the internet tells me 312 is Sylvania, and the chrome-top with the letter-number-letter code under datingg stop sign confirms it.

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