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

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.

Preamp tubes

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.

Lastly, how do you read the date codes on RCA tubes? in my Deluxe, this new Princeton has Sylvania which I am assuming are the originals.

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Tube Experts- Help Decode these NOS Tubes

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.

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

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List of vacuum 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. 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.

Date Codes:Ken-Rad, Sylvania, Raytheon Date-code information from a Stewart-Warner Corp. sevice bulletin. The Need for Critical Tube Tests.

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File:Vacuum tube

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.

I have on facebook on with rca date codes on 15th september I’ve already bought a long page is why you read the. At some 6v6gt tubes are.

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.


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.

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.

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. The Sylvania tube writing scheme was similar to GE’s method – see table below. Philips tubes that may come in the newest box are usually yellow, but occasionally are written in blue. The second box from your right is very similar to the one preceding it.

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

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# in Guitar Amplifier Tubes. #52, in Music Recording Equipment. Is Discontinued By Manufacturer, Yes. Date First Available, February 2,

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Sylvania tube markings

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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.

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.

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