Brimar tubes history book

In anticipation of the primaluna, ive started watching for good deals on brimar cv4003s and have just now rolled in an nos pair. The partial white print on the glass reads cv2975 kb ad missing on one tube. This company made tubes under the mazda and brimar names, as well as ediswan. But 20 jobs have been lost after brimar, which specialises in military electronics and cathode ray tubes for the film and tv industries, fell into administration in november last year, blaming the. Starting today with 1876, e1t and qqe0320 199912 russian and mazda tube number systems. In history, there was a period when such tubes were well available, and it was simply nice. Fyi, mazda was a british company for those who dont know, and in the 1920s ediswan and mazda were major makers of radio tubes. Close matched set of 2 mullard brimar el34 valves taken from a matched set of valves from a vintage simms watts amp stored for quite a few years you are bidding for these 2 valves only. Vintage rcmp four dale of the mounted books plus 118 nos. Theres many brimar tubes out there similar to that 12ax7.

Get a view of an entire thread on one page for sale ads. If you count the number of tubes tested, including the backup pairs, and consider that we had three locations where burnin could take place, and that eight hours of burnin per day is a realistic figure we avoided leaving the amps on unattended, youll begin to realize the vast scope of this. They look like the 1955 red label in the brimar picture here. Brimar tube range brimar thermionic products official site. I discovered that scanning actual tubes is quite possible. It is interestingly written, factual and often refers to actual visits by the writer to the various geographic locations, buildings and key people, for which it provides visual descriptions. Brimar launches at nvcf brimar thermionic products official site posted on 19042015 by brimarbob 22122015 with only a few weeks to go, the team at brimar have been busy preparing websites, products and valves for the national vintage communications fair on may 10th. It is important for any highend audio product to remain active for best sound quality, and the bhk signature is no exception. Only a few types are still used today, mainly in highpower, highfrequency applications.

The ragged old box also has the red brimar name printed just like the tube. Many industrial, military or otherwise professional tubes were also produced. In 1930, when somebody did that on a box with 100 pcs, even when it took him the whole day, the result was 400 little gold pieces. How to build a two valve set a practical project from cigarette cards in 1929. Large halo getter with black anodes and copper supports. Philco purchased the national union tube plant, in lansdale pennsylvania, in 1947 so they could produce television tubes and car radio tubes for the ford motor co. The only brimar about this tube is the stamp and the box. What with banks losing paperwork and problems with. The simplest vacuum tube, the diode, contains only two elements. In history, there was a period when such tubes were well available, and it was simply nice business to replace the solid gold tips by gold plated brass. Stcbrimar was a uk subsidiary of the american giant itt international telephone and telegraph. Brimar was established in 1922 and during our life we have been part of world renowned companies such as edison swan electric, cosmos, mazda, baird television, ferranti, aei, emi, thorn, marconi and the rank organisation. These have the same tube type code 1571 as brimar 12au7 long plate tubes. The oxford style book speaker system for my record player jolene put your records on.

Well, we did mullard last week so this time, lets look at the brimar type and date codes, oft seen on valve envelopes in minuscule inked print, but what do they mean. This site features kr audio products and some of the finest in highend audio for the lowest prices in the world. You can click on after the tube type number to see it. With the rolloff of really good brimar tubes, the dared plugged into my little solid state amp sounded virtually identical to my amps with tripath or abletec class d modules, only a little better in some ways. If you look at the hard cover tube amp book from groove tubes you will find pieces by me. Hi all i have a lector zoe preamp to try out from the emporium and it comes with 2 electro harmonix 6922 valves. Another great tube is the brimar 12bh7 best for mids even better is the variant cv5042 a military tube made for the airforce. Brimar vintage valves and vacuum tubes for sale ebay.

In another of the coincidences in this story brimar was located at the rochester airport site but in. The story behind ghostbusters woriginal stickers 1984. Valve vacuum tube data sheets and application notes keith snook. Yo peeps, today we are going to look at the retma valve numbering system. As with mullard, much more information can be found about stcs valvestubes usually branded brimar, although this was sold to thorn in 1960 than about their transistors.

Tubes are matched for both current draw ma and transconductance gm. The preamplifier gain stage is an alltube, class a design equipped with a pair of renowned 6922 tubes standard or. However, information about this period of their industrial history is scarce. I have all of the above top rated rca and sylvannia tubes and prefer the sylvania thick o getter over the any of the rcas. Brimar kbad e88cc cv2492 gold pin valvetube v43 ebay. When in standby mode, all the internal solid state circuitry such as the headphone amplifier. Im still looking for a good history book on the 30 years war. After 20 years of stocking 6sl7 tubes, we see the same old thing happening as with all nos tubes, but i have to admit, this comes by surprize to me with 6sl7. In the early 1960s stc spun off brimar to thornaei radio valves and tubes ltd the history gets a bit complex. In 1960 thorn electrical industries acquired the brimar cathode ray tubes and valve business from stc and in 1961 brimar became part of the joint venture. How to make a valve amplifier a practical project from cigarette.

For over 20 years, i have had the remainder of a brimar 12at7 bulk pack. Brimar, which stood for british manufactured american radio valves, used. The history of the thirty years war and millions of other books are available for amazon kindle. A lot of players feel that a highergain 12ax7 in their first preamp position must be a good thing, equating more gain with more goodness. Many greatest books and movies, contain stories which never happened. Heavy batteries were also necessary, which made the socalled portable a very hefty proposition to carry about. Inside, you will find 144 pages of 1953 season racing data, including point standings, racing results, brief driver biographical info. This is an original, new old stock never soldunused 1954 nascar record book, containing press reference data from the 1953 racing season. Tubes that lack this rolloff e80cc, for instance, are often said to sound solid state or are called transistors in a bottle. In the early 1960s stc spun off brimar to thornaei radio valves and. Most highquality oscilloscopes from the 1950s to the 1960s have many 6dj8 tubes. Basically, d5 is 12au7 for industrial use that passed certain testscriterion. How many brimars are there audiogon discussion forum. Hi john, yes, mullard and brimar tubes would be labelled made in britain or.

Formed from the great british valve project we have used the expertise of many engineers who have provided us with their preferred list of thermionic tubes. I reproduce below an unedited testimonal from someone who bought 2 of these early brimar 6060 and two mullard m8162 which is mullards uprated 12at7 in 1998 and did a back to back test and then emailed me his opinion. There are also qa numbers on some current production tubes. As ever with these things, they inevitable take longer to appear than you want. Current production 12ax7 tubes click on this image for a larger image. This is a list of vacuum tubes or thermionic valves, and lowpressure gasfilled tubes, or discharge tubes.

Find this book on abebooks, an amazon company, offers millions of new, used, and outofprint books. In electronics, a vacuum tube, electron tube in north america, tube, or thermionic valve or valve in british english is a device controlling electric current through a vacuum in a sealed container. In europe, the principal method of numbering vacuum tubes thermionic valves was the. Mullard brimar el34 valves xf2 close matched set of two. The 6dj8 was designed for use as a lownoise amplifier in vhf and uhf tv tuners, an improved successor to the usual 6bk7, but due to its high gain it was used in much highend test equipment. The rare 1960s brimar cv2975 tubes in this precisely matched pair are military spec el84 6bq5 type tubes. Before the advent of semiconductor devices, thousands of tube types were used in consumer electronics. As an essential manufacturer, we are open and fulfilling orders as usual. Brimar thermionic products is the result of the frustration of not being able to purchase high quality valves at a reasonable price.

Part of chapter 4 from this book can be downloaded from. Mullardphilips tube designation news newspapers books scholar jstor february 2012 learn how and when to remove this template message. Brimar, which stood for british manufactured american radio valves, used all american designations. Stc brimar was a uk subsidiary of the american giant itt international telephone and telegraph. The first part, of format numberletternumber is the date code where the first number s. Special quality tubes were sometimes identified by placing the numerical part of the designation between the heater rating and the tube type. They have gray plates with copper grid posts and halo getters with dual supports. Another historic name was that of brimar which started in 1935 and can trace its origins back through standard telephones and cables to western electric in 1922. Using the front panel ps logo button, the preamplifier can easily be placed in standby mode or activated to play music.

Most modern guitar amps call for tubes that were only made by mullard or brimar, if theyre truly of british origin. The seriesstring version 7dj8 pcc88 was also introduced at the same time. Brimar, ediswan mazda, gecgenelex, and tungsram all made vacuum tubes in gt. Both test as very strong, tv7 test 100102 and 104102 were 5050 is good or 65%. Behind the scenes at the internet by andrew blum tells the history and physical attributes of the internet and world wide web. Buy brimar vintage valves and vacuum tubes and get the best deals. Theres also a pair of brimar d5s cv4003 on the way. Their research laboratory and manufacturing plant was based in footscray, kent. History archives brimar thermionic products official site. Try limiting your search by using the advanced search options below to select an author, a date range, a single forum or more specific search terms. Brimar codes come in two parts separated by a forward slash. Gold lion el84 all tubes in the el84 family are tested in a cathode biased amp where they are really pushed and their harmonic content blooms. The gold lions just sound great at any volume level. Now suddenly we get regularly requests, we have regularly sales, even with prices go up, and no new stock arrives any more.

These four will cover the most important spots on the front end. Deep shiny chrome gettering typical of the 50s brimar british made tubes. The plates look to have a different coating than anything else coming out of new sensor in el84s and this, combined with a heavy gage crimped plate seems to really keep the noise down. Double clicking on your comments re luther, bismark etc. I havent found this set of tubes laid back or lacking in dynamics.