A few math later i realized that this project was feasible and i ordered parts to build an amplifier. The 1959 book lost some older tube data, and some of the good info in the appendix, but gained a bunch of picture tube crt data, modern tv tubes, as well as some other odd info like crystal diode data. Duncans amp pages are brought to you by duncan amplification. The series shares the eia 9bf pinout with a number of other miniature pentode. Before the advent of semiconductor devices, thousands of tube types were used in consumer electronics. You can use the search to find service types or go to the service type lists that you can access from the page more tube related stuff. The 12b4a is a miniature lowmu triode designed primarily for service as a verticaldeflection amplifier in television receivers. With almost datasheets and the visitor counter indicates over 4000. I never used the 12b4 myself and only stashed away a few of them many years ago. For pushpull operation, a tuned, balanced output tank circuit is required. If the page is blank click here rca 6fq7 6cg7 datasheet. In12 nixie data read 227 times 0 members and 1 guest are viewing this topic. I had a heathkit nixie tube frequency counter when i was a kid, plus the numitron calculator and the clock too i think the clock was called panaplex. Looking back at most of my tube designs, and most of those on the internet, revealed a very typical pattern.
Only a few types are still used today, mainly in highpower, highfrequency applications. The tube features high plate current at relatively low plate voltages. Tube 12b4a or rohre 12b4a id5301, triode, vacuum, noval, b9a and shown. Matt describes the design and construction of a 6em7 singleended triode set amplifier. Oct 05, 2016 keeping in mind the necessity of a current not exceeding 10ma trough it it roughly corresponds to twice the e140 grid current at maximum positive swing the 12b4a is the tube to go. Rca homeentertainment and industrial receivingtype tubes and on picture tubes. Amplifiers tended to be flat chassis with tubes and transformers above and electronics below. Get the best deals on ge vintage electronics when you shop the largest online.
An 829b dual beam power pentode cw transmitter don huff, w6jl. Vacuum tube 12b4a, triode, low mu antique electronic supply. Intended for use in equipment having series heaterstring arrangement. Pdf 12sk7, 12sk7gtg 12sk7 12sk7gt 12sk7 6sk7 12sk7, tube 6sk7gt k712 scans0017289. My tube manual indicates that these tubes are video amplifiers. The data sheet indicates that it was intended for use within a series heater chain. In most applications the ux112a could simply drop in to a socket meant for the ux201a. Keeping in mind the necessity of a current not exceeding 10ma trough it it roughly corresponds to twice the e140 grid current at maximum positive swing the 12b4a is the tube to go. Substitutes are given as a guide only please refer to original manufacturers data sheets to ensure that a substitute is safe and appropriate for your application. Supplementary dataobsolete tube types model 539b539c tube testers note1. Headphone amplifier vacuum tube headphone amp mini hifi stereo audio with low ground noise output protection for headphones fosi audio. At over 750 pages this one has to stay broken into pieces.
The ttl data book for design engineers unknown binding january 1, 1981 5. Filament voltage and current stayed the same 5v, 0. The tube data for the 12b4a from duncan amps suggests an operating point of 150v on the plate and 35ma with bias set at 17. Bill beechs online tube data from mostly rca manuals. The e140 is biased such a way that the amp works a2 for a small portion of grid swing, then switch to a2a1. The letter, in the column that precedes the mutual conductance reading, indicates the setting for the function switch.
I never used the 12b4 myself and only stashed away a few of them. Youll have to look to see if the data you want is in there. This is a list of vacuum tubes or thermionic valves, and lowpressure gasfilled tubes, or discharge tubes. As of 3505, i have finished scanning the general section, receiving tubes part 1, receiving tubes part 2, miscellaneous, specialpurpose receivingtype tubes, thyratron, ignitron, and glowdischarge tubes, and most of the transmitting tubes, as well as all. Unfortunately sylvania didnt put data sheets on separate pages they run together so its hard to break up the data into individual files and index them, like the hb3 data set is. At 20k load its linearity is excellent and is able to deliver 350vpp with low distortion, giving a driving voltage behind it up to 60vpp. This was achieved by changing the thoriated tungsten filament to an oxide coated one.
Certain articles, designs, software products, and graphic images presented or made available through these pages are proprietary andor subject. Sony multimedia data discman electronic book player dd85 made in japan. Our preferred method of payment is via wire transfer of funds. The singleended 6em7 ampifier is housed in a vertical wooden chassis styled after early tube equipment of the 1920s.
Although originally marketed as pentode tubes for use in early television receivers, they found additional uses in audio and radiotelephone equipment. This is done in case of equal tube type numbers for different tubes. I found a large amount of matched pairs tektronix, inc. See the cunningham data sheet for all technical parameters of this tube.
The 12bv7, 12by7, 12by7a, and equivalents were a class of mediumlow gain, pentode vacuum tube amplifiers using the noval socket configuration. Made in russia, these premium driver tubes are compatible with any 12bh7 tube. Data from or other sources as supplied by john atwood. As of 3505, i have finished scanning the general section, receiving tubes part 1, receiving tubes part 2, miscellaneous, specialpurpose receivingtype tubes, thyratron, ignitron, and glowdischarge tubes, and most of the. Mullard ez81 for sale in uk 18 secondhand mullard ez81. In this peculiar amp grid current do not flow all the time unlike shishidos amp and i cannot take advantage of permanent current cancellation. I am working on scanning and placing on this page the entire rca hb3 tube manual. Tube \ 12b4a tube low mu triode 1800rfparts 18007372787 17607440700 usa orders. There is a rule of thumb that says you should pick a load impedance that is approximately 2. Mar 17, 2017 this was achieved by changing the thoriated tungsten filament to an oxide coated one. Nos tube specification sheet nos tube specification sheet. The 1943, 1949 and 1959 sylvania tube manuals online. In my listening experience, these 12bz7 are very, very clear articulate, and tend to emphasize treble a bit. Get the best deals on other vintage electronics when you shop the largest online selection at.
Singleended 12b4a tube amp with ecc802s driver diy push. The clean output power from the 6em7 set amplifier is 2. I had a heathkit nixie tube frequency counter when i was a kid, plus the numitron calculator and the clock too. Whilst the information contained in these pages is provided in good faith, no responsibility can be accepted for errors or omissions. Tube 35c5 or rohre 35c5 id3591, beam power tube, miniatur7pinbase b7g, usa 1940 and poweroutput shown.
The parameters would make it usable for example in line stages or as output tube in phono preamps or dacs, offering nice low output impedance. What really drove me to build this 6em7 amp was an idea about amplifier layout. The following list shows the tube types i have entered in my database, with exception of the service types e. See all 2 formats and editions hide other formats and editions. Many industrial, military or otherwise professional tubes were also produced. See the general electric data sheet for all specifications. Headphone amplifier vacuum tube headphone amp mini hifi stereo audio with low ground noise output protection for headphones fosi audio p2 4. I used 14 gauge enameled wire from the junkbox and wound the tank inductor in two sections, using a 4 o. England there used to be a book by babani that had valve amplifiers in the kilowatt range. Diy audio projects forum the big high power williamson.