I poured over a bunch of data sheets to compare values and decided it would probably be suitable. I had a heathkit nixie tube frequency counter when i was a kid, plus the numitron calculator and the clock too. I found a large amount of matched pairs tektronix, inc. Jun, 2007 hi all, according to one internet expert, the 12ad7 was developed by sylvania, supposedly to capture a share of rcas 7025 market. Data sheet and box are a bit tattered but the tube is an excellent tube, you really do get.
In most cases, they can all substitute for each other. Most small signal vacuum tube devices have been superseded by semiconductors, but some vacuum tube electronic devices are still in common use. The m80, for example, is a little el84 based, single ended amp two in parallel with two signal paths. Heres why, common pi tube choices include many of the 12a7 family. I found these tubes inside the previously mentioned akai tape recorders as well. All prices are per tube amperex 6688a usa made 6688e180f these 6688a have black plates, nickel pins, and amperex orange globe printing 10,000. 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. In electronics, a vacuum tube, an electron tube, or valve british usage or, colloquially, a tube north america, is a device that controls electric current flow in a high vacuum between electrodes to which an electric potential difference has been applied the type known as a thermionic tube or thermionic valve uses the phenomenon of thermionic emission. Pictures of japanese nec 12ad7 tubes audiokarma home audio. The sylvania type 12ad7 is a high mu double triode rigorously controlled.
If the page is blank click here sylvania 12dw7 datasheet. I think sylvania devised the 12ad7 as a special version for preamp circuits, ca. A 6sj7 triode strapped has very similar characteristics to a 12au7. Our preferred method of payment is via wire transfer of funds. Nj7p tube database search nj7p tube database search youll note the 6ac7 is listed as a substitute for the 6sj7. Can the 7af7 be rolled in for a 6sn7 in any pre amp using the 6sn7 i currently use a blue circle bc. Another tube that exhibits the same phenomenen to me is the triode section of the 6k8 or 12k8 tube. Tube 12at6 or rohre 12at6 id2948, double diodetriode, miniatur7pinbase b7g, usa 1940 and audio frequency shown. Below are most of the commonly known variations of the 12at7. If the page is blank click here rca 6fq7 6cg7 datasheet. Tube 12ad7 or rohre 12ad7 id5273, double triode, noval, b9a and shown. Ge essential characteristics, the whole 228 page book in an indexed pdf file big, 11mb. My tube manual indicates that these tubes are video amplifiers. The magnetron is the type of tube used in all microwave ovens.
On the other hand, the 12by7 is indeed designed for use as a class a amplifier like the 12ax7 but do not plug that tube in. With almost datasheets and the visitor counter indicates over 4000. They do list it in their tech manual in the condensed data section, as does ge, but rca refuses to acknowledge its existence. Another very rare tube that was primarily made for and found in. I will first attempt to describe each version and provide data for each. 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. Notify me of updates to 6j51p 6zh51p 6ej7 ef184 tube. It has much higher transconductance, and much lower dynamic plate resistance than a 12ax7. Then, i will follow up with short descriptions of some that i currently have for sale. Please see the substitutes at the top of the page for more details. You can give them a try, but if you dont like a 12at7 subbed in whatever position you try, you will probably not like the 12av7. Numbers shown in light blue background are coldcathode tubes.
The 12at7 is a high mu multipurpose double triode in a 9 pin miniature package. I am working on scanning and placing on this page the entire rca hb3 tube manual. In electronics, a vacuum tube, an electron tube, or valve british usage or, colloquially, a tube north america, is a device that controls electric current flow in a high vacuum between electrodes to which an electric potential difference has been applied the type known as a thermionic tube or thermionic valve uses the phenomenon of thermionic emission of electrons. In electronics, a vacuum tube, an electron tube, or valve british usage or, colloquially, a tube north america, is a device that controls electric current flow in a high vacuum between electrodes to which an electric potential difference has been applied. Were you referring to the print for the tube id, 12ad7, as being similar. Vacuum tubes can be tested outside of their circuitry using a vacuum tube tester. The 12k8 was a popular tube that was used as the mixeroscillator in the command set receivers and several other surplus sets. 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. 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. It needs to be said, though, that you should consider trying the amps before raping them for the tubes. The 12ax7 is one of the most widely used double triodes in audio circuits.
In12 nixie data read 227 times 0 members and 1 guest are viewing this topic. Made in russia, these premium driver tubes are compatible with any 12bh7 tube. Tube 6ar5 tube power amplifier pentode 1800rfparts 18007372787 17607440700 usa orders. Etc, alldatasheet, datasheet, datasheet search site for electronic components and semiconductors. Bold designators are close or identical, italic designators are different ratings, different pinouts or different filament voltages. Hey thom not that i recall knowing, offhand, except that i think some nec branded 12ad7s may have been obtained from sylvania. Data for soviet tubes can be found the same way as the other tubes. That tube was designed to be used for a vertical deflection amplifier for a tv. According to one internet expert, the 12ad7 was developed by sylvania, supposedly to capture a share of rcas 7025 market. Double triode, 6h8c datasheet, 6h8c circuit, 6h8c data sheet. Hard to find, as a retired tube dealer i have never seen more then a handful of these.