File:Vacuum tube

It looks like you’re new here. If you want to get involved, click one of these buttons! Free Shipping on All Orders! Contact Account Shopping Cart. July edited July in Electronics. All 4 tubes test strong. The RCA on the far left has a 30 degree slanted disk getter.

6SN7 Tube Addicts

The vacuum tube business was a very incestuous one, so much so that you can rarely trust everything that is printed on a tube. Often, the printed brand or printed country is incorrect. Vacuum tubes were simply a commodity that everyone needed like batteries or light bulbs are today.

Do not buy this item and then ask us to falsify the forms,The last photo shows the tubes as we received them, All were tested on our Hickok C tester, The.

Oskari Somebody should explain the various Sylvania date codes! It’s about time. Agreed, does the Tube Lore have any info? I left my copy home and I can’t check. Actually it might if those tubes are from about to ! Thanks Oskari, I was told they are 40’s vintage. Have a nice day. Len The next three numbers tell you the year and month. The first digit of the three numbers is the last digit of the year.

The next two digits in this grouping represents the week of production. A tube that reads ” ” means it is manufactured by Sylvania in the 35th week of a year ending in 2 , , , etc.

Found these in an alley – RCA and Sylvania 6BQ5/EL84’s

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(up)date, title, size. , French Sylvania Receiving Tube Manual Thanks to Thierry Magis. 15,, bytes (fr). , Spiral accelerator.

When you join the TCA you automatically get the current year’s back issues! Volume 13, Number 1 – February, The Deflex Tube This obscure tube was the first radio tube made by Machlett. The “Single-Tube” Radio Using a single tube type for all stages of a set. Volume 13, Number 2 – April, A Speculative Edison Triode Incandescent lamp engineering leading to the evolution of the triode.

The Technology Conundrum A novel approach to defining what “technology” is. Rejuvenation of Vacuum Tubes Techniques for returning tubes to useable transconductance. Self-Service Tube Testers The economics of providing self-service tube testers. The Ballast Resistor Situation System development for ballasts. Volume 13, Number 3 – June,

Sylvania tube markings

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Wow, tubes in an alley? How does that happen? Date codes will be on the side if they haven’t been rubbed off. From the logos, they are mid.

Discussion in ‘ Tube Audio ‘ started by dewdude , Apr 30, Log in or Sign up. Sylvania tube markings Discussion in ‘ Tube Audio ‘ started by dewdude , Apr 30, Messages: 3, Location: Manassas, VA. Got just a general odd question if anyone out there knows Sylvania tubes. I ordered 3 sleeves of JAN’s. All of the boxes are parked “Packed “. I know Sylvania used 3-digit date codes from my research, but these have written vertically.

Honestly, I’m not worried about the date code. What I found interesting was the etching. On my one sleeve, it’s the standard black.

List of vacuum tubes

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Does anyone know the meaning of older Sylvania tube date codes? I am looking at some 6v6gt tubes that have a Maybe the 13th.

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Tube Experts- Help Decode these NOS Tubes

It is a long page, use your scroll button and scroll down the page to see it all. This list is antique types only. I will make every attempt to keep this up to date, but if you need a quantity of any of these tubes, please e-mail me. I can give you an up to the minute stock check. These tubes have been out of production for decades, and supplies are usually poor.

I was wondering if anyone has date code keys for sylvania or GE fluoro tubes or westy lifeguards. If anyone does please let me know. Thanks.

Forum Rules. It also looks more bad ass! Sent from my iPhone using Tapatalk Pro. Experimentation like this makes for an interesting and fun hobby. A good learning experience. So, two weeks have passed.

NOS Matched Pair Sylvania 6SN7GT Black Plate Vacuum Tubes Same 1949 Date

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13, – (!!!!!) (~ Best Sylvania Pair ~) 12BH7A Sylvania NOS ‘s same date codes. Best Sylvania Pair ~) Sylvania NOS same date codes Tube, Dating​.

Sylvania was probably the most prolific American tube manufacturer, and their tubes were found packaged by many well-known USA name brands. Among the EIA codes that you will find on Sylvania-manufactured tubes are and Here are photographs to illustrate the wide diversity of companies that Sylvania manufactured for…. Please note that these companies distributed tubes by other tube manufacturers also.

Notice that Sylvania Chrome-Top tubes will always have a code adjacent to the tube-type. The code consists of three characters, usually but not always in a Letter-Number-Letter sequence. Apparently Sylvania had already silkscreened this tube with their own logo, but subsequently the inventory was purchased by CBS. It is obvious that CBS attempted to remove the Sylvania logo, but under careful light it is still visible.

You can easily identify the tube as Sylvania-manufactured. They were part of sleeve of 6AQ5A, virgin inventory found directly from a Sylvania distributor. The tubes have factory matching glass codes, but one tube was Gray-Plate construction, while the other 4 tubes in the sleeve were all Black-Plate construction. I have seen same-codes-different-plate situation before, but rare to find them supplied in the same sleeve.

For example, Allen Organ Co. Even without the Sylvania logo or EIA codes, Sylvania used a 5-alphabetic code, consisting of 2 letters followed by three letters.

NOS Date Matched Pair Sylvania USA 6SA7GT Grey Ribbed Plate Smoked Vacuum Tubes

The last box to your right is identical to the first box of the ECG line. The two boxes in the middle are shown with the top flap up. Other than the flap, the design is identical except the older is flat while the newer is glossy. Writing color was usually yellow, occasionally red sometimes the red appeared more like orange and is given as such in the tube lists , and more rarely green.

This is a list of vacuum tubes or thermionic valves, and low-pressure gas-filled tubes, SY – Standard Telephones and Cables/Brimar (not Sylvania Inc.) The oldest numbering systems date back to the early s, such as a two-digit.

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Telefunken Mullard Amperex Raytheon RCA Sylvania 12AX7 Shootout

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