In electronics, a vacuum tube, an electron tube, or valve, or colloquially, a tube, is a device that controls electric c. There are a lot of different vacuum tube types, all with their own applications, characteristics and construction. Vacuum tubes are used in a wide variety of applications. This category contains pages explaining various vacuum tube app. In electronics, a vacuum tube, an electron tube, or valve, or colloquially, a tube, is a device that controls electric current flow in a high vacuum between electrodes to which an electric potential difference has been applied. This page lists the different vacuum tube types which are described on the resistor guide. This category contains pages explaining various vacuum tube applications.

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Users browsing this forum: Google [Bot] and 8 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.

Power Tubes – Warranted to be free of burn out for 90 days from date of purchase​. Page 5. GROOVE TUBES • TUBE REFERENCE GUIDE. 5. Tube Replacement?

Question: What is a vacuum tube? Answer: A vacuum tube is an electronic device consisting of a minimum of four active elements: a heater filament , a cathode, a grid and a plate, all sealed in a vacuum glass enclosure to prevent parts from burning. Once heated, the cathode begins to emit electrons, which flow from the cathode which is negatively charged toward the plate which is positively charged. Question: What is a JAN tube? These are tubes that have been manufactured to a military specification or have been specifically selected for a military application.

These tubes were either ruggedized during manufacture or selected from a very tight specification for highest performance and reliability. Since these tubes are no longer in production, when the current supplies are sold there will be no more. Question: What is grid leakage?

Date Matched Pair RCA USA 6SJ7 Metal Vacuum Tubes 91% & 91%

Thank you for visiting nature. You are using a browser version with limited support for CSS. To obtain the best experience, we recommend you use a more up to date browser or turn off compatibility mode in Internet Explorer. In the meantime, to ensure continued support, we are displaying the site without styles and JavaScript. FOR many years the literature of applied physics has lacked a really up-to-date and complete account of the phenomena occurring inside valves.

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

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.

US2486065A – Lead-in structure for vacuum tubes – Google Patents

Filament Voltage life. HV arcing peak voltage when mistuned. Tube Characteristics. Power grid vacuum tubes are used in amplification systems where grid to cathode voltage controls plate anode current.

Pair of new old stock RCA 6AG7 metal vacuum tubes. In original boxes Matching date codes Excellent condition Tested on a Hickok B Cardmatic tube tester.

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 In some valve part number series, the voltage class of the heater is given in the part number, and a similar valve might be available with several different heater voltage ratings. The system assigned numbers with the base form “1A21”, and is therefore also referred to as the “1A21 system”.

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Blood Tube Labeling Information. Each tube used for blood collection is labeled by the manufacturer with important information. This information includes: tube volume in milliliters mL , expiration date, lot number and, if applicable, the type of additive that is in the tube.

(Best Long Plates Pair) ECC82=12AU7 Valvo Hamburg Germany NOS with 17MM “long gray ribbed plates” and “O” getter same date codes (/​ma and.

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.

C Ditto. G Glass bulb. GT Glass tubular. W Ruggedised version. X Low loss ceramic base. Y Low loss phenolic base. What does J.

Vacuum Tubes

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Close look at Vacuum Tubes from the 1910s, 1920s, 1930s