6SN7 Tube Addicts

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Get the best deal for SYLVANIA Vintage Vacuum Tubes from the largest Sylvania 6SN7GT Black Plate Vacuum Tubes Same Date.

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. They ran out of stock of one particular type and contracted another company to make them to fulfill an order. This is why you see even major brands like Sylvania with RCA date codes. If they could source the tubes cheaper than they could manufacture them.

Ironically, European tubes like Telefunken and Mullard were seen as inferior to US tubes at the time as they were cheaper and many tubes you will see an RCA labeled tube that was really produced by Telefunken. When trying to identify a tube it makes the most sense to first determine where it was made. This is important for two reasons.

Sylvania tube markings

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These NOS tubes came from a Raven Audio integrated amplifier and Basically looking for vintage / approximate date of manufacture and Philips ECG normally means Philips US production at former Sylvania tube plants.

Discussion in ‘ Audio Hardware ‘ started by avanti , Dec 17, Log in or Sign up. Steve Hoffman Music Forums. Location: Chicago metro, USA. These NOS tubes came from a Raven Audio integrated amplifier and we would like to understand what vintage these tubes are if possible in order to order duplicates. Can only make out RCA on rightside 2. Location: Somewhere in the middle. A is an industrial grade 12AT7. GE datecodes are tougher to work with as there’s not a handy chart like the RCA one above.

Philips ECG normally means Philips US production at former Sylvania tube plants – they kept those plants running to supply tubes for military gear like GE until at least I haven’t run across an explanation of how Sylvania datecodes work – hope this helps you out.

Identifying Vintage NOS Vacuum Tubes by Brand Country and EIA Code

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Date Codes. «on: September 20, , PM». Someone was asking about a Sylvania tube date a while back but I can not find the thread. anywho.

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.

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

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. Any help figuring out the dates would be greatly appreciated. Where are you Brock?

NOS Sylvania 6SN7GT Black Plate Vacuum Tube 1949 Date

Users browsing this forum: Google [Bot] and 7 guests. Sylvania Vacuum Tube Date Codes? Posted: Nov Thu 09, am. I have a bunch of Computer grade Sylvania ‘s made for the Buroughs Corp. All have manufacturer codes and a date code of on them. How would you read this.

Apr 15, – Find many great new & used options and get the best deals for 5 N.O.S Vintage Sylvania 6BF5 Vacuum Tubes w/Date Codes NR.

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.

List of 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.

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.

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

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. If I have the original box, I will supply it, but many have not survived the years.

I have the brands on hand listed, but stocks of each brand are very limited.

Early Sylvania Big Bottle 6CA7/EL34s

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.

12AX7 – Vacuum Tube (2) – Sylvania. mullard 2 X I’ve searched the Web for a key to Sylvania date codes, but no luck. not a kit.

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. And I brought back the Cardas Clear Cygnus speaker cables. I guess I would have to use the example of going from a fine wine to a inexpensive wine and back again. Welcome to the AudioShark Forums. What’s New?

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

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. Only a few types are still used today, mainly in high-power, high-frequency applications. Receiving tubes have heaters or filaments intended for direct battery operation, parallel operation off a dedicated winding on a supply transformer, or series string operation on transformer-less sets.

High-power RF power tubes are directly heated; the heater voltage must be much smaller than the signal voltage on the grid and is therefore in the

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.

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 Two of the sleeves vary from this one.

Sylvania 4bulb pre-heat fluorescent ceiling fixture

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