Many industrial, military or otherwise professional tubes were also produced. If you have mullard 12bh7 theyre either iec mullards or rebranded by someone else to increase value. If the page is blank click here rca 6fq7 6cg7 datasheet. Book depository books with free delivery worldwide. Only a few types are still used today, mainly in highpower, highfrequency applications. This is a suitable replacement for any 12bh7 tube type. Cary 19mm id 5mm thickness tube dampers silicone oring amp for shuguang 12ax7 12au7 12at7 12bh7 el84 10pcs. Far exceeding thquality of any 12at7 tube being made today. Tube 12bh7 or rohre 12bh7 id5310, double triode, noval, b9a and universal shown.
Although originally marketed as pentode tubes for use in early television receivers, they found additional uses in audio and radiotelephone equipment. With the very large number of vacuum tubes or thermionic valves that were produced and as a result of the multiple vacuum tube numbering systems that were in use, there are generally equivalents for most types of tube. Ecc99 jj best identical substitute is 12bh7a rca, raytheon, sylvania and ge. At the bottom of this page youll find some links to other tube datasheet sites in. I managed to get two nos ones a while ago, but im concerned about long term support. 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. Tested and noise tested on our vtv tube characterizer. The 12bh7 tube is used in hammond ao28 preamplifiers. Vacuum tube 12bh7a, triode, dual, medium mu image 1. Electroharmonix 12ax7eh preamp vacuum tube, single.
Can you substitute a 12bh7 vacuum tube for a 12ax7 or 12au7. It is a dual triode two section tube, one side used for the vibrato drive circuit, the other side used for the final output stage. This is a great us made replacement for any 12bh7a tube type. Replaced a jj ecc82 in my harman kardon a300 stereo amplifier in the phase inverter position. I am working on scanning and placing on this page the entire rca hb3 tube manual. In a few cases, when the 1966 edition omitted graphics on obsolete tubes, i inserted scans from the 1948 ginkins reference book. Eirc electronic tubes factory data sheet 12bh7 page 1 of 4 telephone. A place for tone seekers to discuss tube amps and analog goodies. Unfollow 12bh7 tubes to stop getting updates on your ebay feed. Rectifier comparison and interchangeability chart kca. Mar 19, 20 12bh7a ppp amp design by nobu shihido, presented in his book transmitting tube amplifiers. The 12by7a is a 1950s video amplifier output valve designed for boosting wideband tv video signals to a sufficiently high level to be transmitted over a considerable length of cable without loss of quality.
This is a list of vacuum tubes or thermionic valves, and lowpressure gasfilled tubes, or discharge tubes. Vacuum tube 12bh7a, triode, dual, medium mu antique. Is this because the settings im using is for 12bh7 as thats all on the tube data roll. May 22, 20 can you substitute a 12bh7 vacuum tube for a 12ax7 or 12au7 or 12at7 or 12ay7.
Nos tube specification sheet nos tube specification sheet. This makes it ideal as a driver for power tubes in modern audio amplifiers. Variable power output makes the tubemeister 5 perfect for live, studio, or at playing home. I try to concentrate on popular andor readily available tube types. 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. Always check the bias and idle power of the tube with the new rectifier to be certain that it is running within spec. Tube datasheets here youll find a modest collection of datasheets for some popular tubes. Double triode quick reference data anode current ia11,5ma transcoductance s3,1mav amplification 16,5 heating. The 12bh7 shares many similarities to the 6sn7 also a favorite tube around these parts, but is characterized by a darker sound.
The allnew tad 12bh7astr combines the best sonic and mechanical. This list is biased by the tubes that i have encountered during the repair of the many tube amps that have come to my repair shop. Variable power output makes the tubemeister 5 perfect for live, studio, or. At the bottom of this page youll find some links to other tube datasheet sites in case you cant find what youre looking for here. I have a cayin ha1a and which uses 12ax7, 12au7 and two el84. It has much higher transconductance, and much lower dynamic plate resistance than a 12ax7. Purchased this tube to replace a 12at7 tube in a 1. 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. Makers describe the 12by7a as a pentode but the construction is as a beam tetrode. Telefunken nos vacuum tubes for sale tubes unlimited. The 1960s ge 12bh7a tubes in this precisely matched pair have halo getters and gray plates with copper grid posts. Mar 24, 2014 the 12by7a is a 1950s video amplifier output valve designed for boosting wideband tv video signals to a sufficiently high level to be transmitted over a considerable length of cable without loss of quality. The only difference between the two is that the heater of the 12bh7a is designed for use in seriesstring heater circuits in tv sets the tube was used as a vertical oscillatoroutput tube in tvs, as well in other applications. But im still sticking with tungsol as my best guess.
I can say that the 12bh7a sylvania works best for meits a matter of system synergythe 12bh7a sylvanias i use were purchased at tube world and they usually have a few versionsi use the yellow print. Most of the datasheets are in pdf format and some are links to other html pages. The kenwood ts830 uses one for a driver and that is early 1980s. In most cases the tubes manufactured to the european system have an exact equivalent tube in the american system and vice versa.
Gary gave me a couple of the boards that he designed for it, plus the working completed prototype, with which to experiment. External links wikimedia commons has media related to. In the past, this tube was known simply as a favorite driver for the old macintosh amps, or as an inexpensive alternative to the 5687 and the 12au7. Eh12bh7 first impression posted by jj triode a on march 11, 2005 at. So most ham manufacturers jumped on it from the start and used it until the end of tube sets. 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. It was discovered early on that it would make a splendid crystal oscillator for ham rigs and driver tubes for the higher power transmitters. The series shares the eia 9bf pinout with a number of other miniature pentode tubes of the era. Vacuum tube 12bh7astr, tube amp doctor, premium selected. In the past, this tube was known simply as a favorite driver for the old macintosh amps, or as an inexpensive alternative to.
Bought this to replace a bugera 12bh7 in my amplifier after the amp was turned on with no load, sounds even better than the original,gained a little clean. Lows and mids are dynamic and detailed, soundstage depth increased. The allnew tad 12bh7astr combines the best sonic and mechanic performance of the nos rca black plate with the ge version. In addition, when changing to a higher output rectifier in a self biasing aka cathode biased amp, eg, champ and others never assume that the power tube s isare safe. Tube 12bh7a or rohre 12bh7a id5311, double triode, noval, b9a and shown. Im happy using sovtek 5881s as outputs they work really well in my setup, and am looking forward to the svetlana 6l6, but probably need to pick up a few spares of the 12bh7. All 12bh7 tubes are tested properly under simulated amplifier conditions. Before the advent of semiconductor devices, thousands of tube types were used in consumer electronics.
Champ and others never assume that the power tubes isare safe. Does anyone know of a good substitute for this tube, or a good source of nos ones. Jan, 2006 the 12bh7a is electrically identical to the 12bh7. Can you substitute a 12bh7 vacuum tube for a 12ax7 or 12au7 or 12at7 or 12ay7. The 12bh7 and 12bh7a are essentially the same tube but the 12bh7a incorporated a controlled heater warmup for use in. Brand new gain tested electroharmonix 12bh7 gold pins vacuum tube. Some datasheets are only one page 3050k, some are 810 pages 300k and more. The jjs have a smoother, warmer sound than the electroharmonix 12bh7s that came with the preamp. Double triode quick reference data anode current ia11,5ma transcoductance s3,1mav. I still dont know the manufacturer of this particular tube. Mullard never rebranded or manufactured 12bh7 according to my 1965 data book. Vintage or new, boutique or not, lets talk about the sweet tone makers. Our website features secure payment options and fast, convenient shipping around the world. Recommended ge pair 12bh7a ge gray oval plates nos 19601965.
Increasing the cathode bias resistor is often necessary. That is a single pentode the pins definitely do not match. Rectifier comparison and interchangeability chart kca nos. Can you substitute a 12bh7 vacuum tube for a 12ax7 or. Vacuum tube 12bh7astr, tube amp doctor, premium selected maximum of reliability outstanding tonal quality. These are a little brighter and more detailed than the smooth plate and work perfectly as the phase inverter in dumble style amplifiers or when you are needing a little more crisp clarity from a 12ax7. Guitar wikibooks has a book on the topic of guitarbuying. 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. Its an electrically more robust tube then the 12au7, and as such, your 12au7 is probably taking a severe beating. 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. The white print on the glass has the ge logo label may be partial. This single channel amp delivers the tones you need in the studio. That tube was designed to be used for a vertical deflection amplifier for a tv.