The vacuum repair guy: an endangered species

Description[ edit ] Unlike most other gas switching tubes, the krytron conducts by means of an arc discharge , to handle very high voltages and currents reaching several kilovolts and several kiloamperes , rather than the low-current glow discharge used in other thyratrons. The krytron is a development of the triggered spark gaps and thyratrons originally developed for radar transmitters during World War II. Operation[ edit ] A krytron has four electrodes. Two are a conventional anode and cathode. One is a keep-alive electrode, arranged to be close to the cathode. The keep-alive has a low positive voltage applied, which causes a small area of gas to ionize near the cathode.

Amplifiers

Not open for further replies. I was wondering if anyone knows a site, or has information that might be interesting in this regard. It seems like the pre-WWII tubes don’t have dates and feature the engraved base. Then around the ‘s they started dating the tubes with the week and year. The code , for instance, would describe the year and the 39th week. Some of the ‘s codes omit the first 5 and are simply three digit codes.

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ZENITH Although there were many brands of tubes that came and later faded from the scene, such as Cunningham, National Union and Tung-Sol, one unique brand made it mark both with early reliability and its distinctive blue glass envelopes. Pictured above are examples of “Arcturus Blue” tubes from the s. View of our vacuum tube collection which spans through A general sampling of vacuum tubes used in receivers and small transmitters from the s through the s At the center of photo above is a high power final amplifier tube from a large broadcast transmitter.

Tube sockets, connectors and switches used in the era of “hand wired” radio chassis. An assortment of meters and other components intended for use with hand-wired chassis. An assortment of variable capacitors used in receivers and transmitters of the era Some examples of potentiometers used in early radio construction. Here is some valuable technical information. The chart below illustrates how technicians read the values of components, such as resistors, based on color bands that are stamped on the parts.

Often, this is the only way to identify the value of a part in a radio that is undergoing repair or restoration. You can click the picture below to see an enlarged version. An assortment of radio transformers from the ‘s through the ‘s A collection of radio equipment knobs used between and Please continue on to the next gallery Copyright The Museum Of Yesterday, Chesterfield, VA USA.

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Amperex, Mullard, Philips, and Valvo Tube Codes MostAmperex, Mullard, Philips and Valvo tubes are marked with a group of symbols which contain coded information relating to the type, place of manufacture or country of origin, and the date of manufacture. Apart from the interest of knowing when and where a tube was made, the code group can still provide useful type identification when the commercial markings have become illegible.

There were two types of code formats that used the same tube type codes, which were in use from until these companies stopped the manufacture of standard receiving tubes. The code format changed about or There are some deviations to this rule, and in certain manufacturing plants not all of the code protocol was followed exactly, with every batch of tubes. Prior to , Mullard used a purely numerical code for encoding the tube type, but then adopted the code change as listed here after that.

Therefore, for tubes made after by all three of these large European manufacturers, the code is fairly uniform and straightforward to decipher using these code lists. Of course, as mentioned above, there are deviations in the code that vary from factory to factory and from year to year. This list is presented as found on original Philips documentation. Brent Jessee Recording makes no claims as to accuracy, and presents this information for your use “as is” and “as found”.

The digits are often found near the bottom of the glass on the side of the tube. They consist of two or three lines of numbers, letters, and sometimes symbols. They will nearly all use the following convention, from left to right, top to bottom of the code group:

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To review, I wrote: It had arrived that same day and while Tom listened to classical music I cut open the box and inserted the tubes. It uses a pair of Sino 2A3C a new variant of the 2A3 from Guiguang, rumored to be a sister company of the more widely known Shuguang, and it is favored by Carl for its sound, fit, looks and price. The rectifier tube is a NOS Mullard GZ32 favored by many, but easily replaced thanks to Triode Lab’s unique “Uni-fy rectifier stage” to tune the amp to your preference.

The amp is Class A with an auto-bias circuit and unusually, it is AC heated by preference. The S version is for the connoisseur who not only likes to roll tubes, but roll amplifiers as well. We put the CD into forward, listened for a brief moment, looked at each other and simultaneously broke out into laughter. The top end is rolled off. The presentation is dark, being centered on the lower midrange with a full, sumptuous bass.

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The lengthening of mean free path at low pressures is a key enabler for devices such as vacuum tubes and particle accelerators as well as for processes such as vacuum coating where microscopic particles such as electrons, ions or molecules must traverse considerable distances with minimal interference.

Quantity In Stock — Quantity in Stock new listing categories: Please call us for the latest inventory, and we can often outsource these tubes for you. New Old Stock White Box. Great blackplate Sylvania and Westinghouse GTB tubes screened for demanding use in electronic organs. All have passed the Baldwin factory test for audio use! This is the famous black plate s s version 6SN7 and is in great demand today. Medium glass envelope, marked with the Sylvania green label, the Baldwin label, or the Westinghouse label, but all came from Baldwin.

Organ tubes are especially fine sounding in audio equipment, and we have carefully matched these into pairs and also have singles available. Of particular interest was the Baldwin Organ 6SN7 which to my ears in both a B and 45 SE was as clean as others costing many times more. Click on screen at left.

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DeArmond catalog extracts are shown with each individual amp description. The following is a single page extract from a CF Martin Tube amp catalog: Every DeArmond and CF Martin amp with a tremolo circuit , identified with suffix T in its title, was supplied with a foot switch, Model TFS-1, either hardwired or removable, by means of a jack socket on the underside of the amp chassis.

The foot switch is shown below: An interesting feature of some tube amps sold under both DeArmond and CF Martin brands was the inclusion of one or more electronic circuits in maroon-coloured hard resin encapsulations.

Let’s look at some of the basics of how tubes work to have a better understanding of the benefits of using matched tubes versus unmatched power tubes in a guitar amp. Figure 1 – Simplified illustration of how the fundamental parts work to control current flow in a vacuum tube.

Sign up The vacuum repair guy: Mary Knox Merrill — Staff Sucking it up: We all have a vacuum cleaner story. It might not be as dramatic as my friend Lisa Foote ‘s, whose family ferret was successfully removed from an Electrolux attachment by emergency greasing. It might not be as heartwarmingly odd as my husband’s, whose best friend at the age of 4 was “Vac,” the second-hand Hoover he took everywhere with him — including the car.

But for most of us, the family vacuum cleaner was more than a major purchase; it was a family fixture. Repaired and re-repaired, it was rarely thrown away. All that has changed, says John Huling , hero of three generations of my own family’s vacuum cleaner stories and an emblem of a dwindling breed — the vacuum repairman. It’s easier to go buy a vacuum cleaner than it is to take it to a repair shop,” laments Mr.

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Description Accelerator mass spectrometry AMS is a technique for measuring long-lived radionuclides that occur naturally in our environment. AMS uses a particle accelerator in conjunction with ion sources, large magnets, and detectors to separate out interferences and count single atoms in the presence of 1x a thousand million million stable atoms. They are used for a wide variety of dating and tracing applications in the geological and planetary sciences, archaeology, and biomedicine.

The following is a brief description of each element of the AMS system. The ion source produces a beam of ions atoms that carry an electrical charge from a few milligrams of solid material. The element is first chemically extracted from the sample for example, a rock, rain water, a meteorite then it is loaded into a copper holder and inserted into the ion source through a vacuum lock.

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Questions: Western Electric tubes date codes

Plotting plate current as a function of applied grid voltage, it was seen that there was a range of grid voltages for which the transfer characteristics were approximately linear. To use this range, a negative bias voltage had to be applied to the grid to position the DC operating point in the linear region. This was called the idle condition, and the plate current at this point the “idle current”.

DATE CODES FOR RCA-MADE TUBES Ludwell Sibley There is a sort of fascination with the date codes that are found on classic information, on early RCA tubes in particular, is .

This article is only meant to provide a very cursory overview of vacuum fundamentals, how to produce a vacuum and and some of the more common applications of vacuum technology. A number of resources for further information are referenced at the conclusion. Compiled from material originally presented in Volume 1 of the Bell Jar with various updates and additions. Introduction A vacuum system typically consists of one or more pumps which are connected to a chamber.

The former produces the vacuum, the latter contains whatever apparatus requires the use of the vacuum. In between the two may be various combinations of tubing, fittings and valves. These are required for the system to operate but each introduces other complications such as leaks, additional surface area for outgassing and added resistance to the flow of gas from the chamber to the pumps. Additionally, one or more vacuum gauges are usually connected to the system to monitor pressure.

The More Common Units of Pressure Measurement Traditionally, the pressure in a system is stated in terms of the height of a column of mercury that may be supported by the pressure in the system.

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