File:Vacuum tube

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Identifying Vintage NOS Vacuum Tubes by Brand Country and EIA Code

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. If the tube writing was red, then the box flap tube type writing was usually red.

If the tube writing was yellow or any other color, flap writing was usually black.

I’ve also posted Sylvania tube manuals on their own page. Many files on this site, especially scanned documentation, are in Adobe Acrobat (PDF) format. I.

Started by pucho The Lab. Started by canidoit The Lab. Started by nielsk The Lab. Started by noulou Black Market. Toggle navigation. Register Login. CJ Member California Posts: Someone was asking about a Sylvania tube date a while back but I can not find the thread. If I can’t fix it, I can fix it so nobody else can! Frank’s Tube Page: www.

Tube Experts- Help Decode these NOS Tubes

This is a list of vacuum tubes or thermionic valves , and low-pressure gas-filled tubes , or discharge tubes. Before the advent of semiconductor devices, thousands of tube types were used in consumer electronics. Many industrial, military or otherwise professional tubes were also produced.

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

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. For the most part, back then no one cared when a tube was made or who made it, they just wanted a good product that would work and bring their radio, amplifier or TV back to life.

Which is part of the reason it can be so hard to figure out today. There were a few different reasons a given company would re-brand or write the wrong country of origin on a tube.

Sylvania tube markings

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.

Beautiful pair of new old stock Sylvania JAN (6AK5W) tubes in original boxes and with matching date codes. Boxes have some wear. Tubes are in perfect.

Buy from the experts and avoid hassle! Visit our store to view our inventory of thousands of tubes. Silver plates, metal base. Other options available only by request. Typical transit times:. We pride ourselves on our excellent customer service. Shop with us and find out why the majority of our customers are repeat customers. Vintage Tubes [Sorted A-Z]. Audio Equipment.

NOS Sylvania 6SN7GT Black Plate Vacuum Tube 1949 Date

Discussion in ‘ Audio Hardware ‘ started by avanti , Dec 17, Log in or Sign up. Steve Hoffman Music Forums. Location: Chicago metro, USA.

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

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. The other 2 RCA’s have disk getters but aren’t slanted as much. I noticed that there is a delta mark on the bottom of the RCA’s and in between the pins there is a “61” tube on the far left “12” 2nd from left “3” 3rd left.

The Sylvania is on the far right but I couldn’t find any other markings on the tube.

6SN7 Tube Addicts

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As can be seen in the next two pics, this tube has three holes in the plates instead of two and the year date code is not underlined. The production.

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

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.

Tube Type / Number: 6SA7GT Actual Brand*: Sylvania Printed Brand: Sylvania Quantity of Tubes: Date Matched Pair Plate Construction: Grey Ribbed Getter.

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. I also see “AKU” printed in green which is completely wearing off with even a gentle touch next to the JAN designation. The next line says Sylvania

Preamp 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.

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.

All Rights Reserved. Built with Volusion. Join our mailing list! When the single character codes were used up, double character codes were introduced. For example, the 6SN7 has two cathodes, two grids, two plates, and a filament. Additional letters: A Controlled heater warmup time, although can also be used to denote increased ratings or performance over and above the non-A model.

How to Spot Super Rare 12AX7 Vacuum Tubes part I