7189a tube substitution booklet

Details add to cart the 7189a is uprated version of the el84 440v plate voltage whereas a typical el84 is 300v. Usually you can put a 7189a in place of an el84 but not the other way around. The 6gh8 and other 9ae base tubes is almost exactly the same tube except a small difference in pinout. This manual tells what radio receiving tube will substitute for another and work as a replacement. It has a very smooth sweet breakup just like the jj el84 and it will breakup a couple decibels earlier. Older versions have a third mica spacer near the top. If the equipment is already designed for an industrial tube, a standard receiving tube will not usually work as efficiently or as long as the original. Includes circuit diagrams with parts lists, design considerations and performance requirements, and characteristics chart of rca high fidelity tube types. The tubes i bought where the russian el84 7189a 6bq5 tubes. I looked at it, and it is an el846bq5, and it is supposed to be a 7189a. These triple mica versions are in great demand today. Free vacuum tube data sheets free vacuum tube substitution. To prevent damage to equipment, it would be wise to double check with a good tube manual before actually doing a substitution.

But what do you do when you blow a tube at a gig and its 11 p. 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. Tube substitution guide by mercury electronics corporation mineola, n. Tube substitution handbook by howard sams and a great selection of related books. Sometimes the vintage ge versions may be labelled jg12au7wa in white and have 5814 etched into the glass. 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. Having more than 20 years of experience in manufacturing hiend vacuum tube amplifier, audio space has established a strong position in the international audio. The 12be6 is a converter tube but in looking at the pin connection diagrams for it compared to the 12ba6, it looks as if it could work in place of the 12ba6 andor 12au6 under the right conditions and circuit connections. I have a head and i actually place some foam between the head and the cabs reducing any microphonic which could happen.

The fifth section of this book lists picture tubes and their substitutes. In service as class a or ab1 amplifiers, the 7189 carries generally the highest ratings of the three especially in terms of plate voltage. Not all straight el84s can sub for 7189as due to the plate voltage differences. Another tube with identical pinouts to the 6cz5 is the 6em5, and i have 300 noss of those. The picturetube section lists over 426 types, with recommendations for 825 direct substitutions.

The az in the phase inverter sure seems to be the trick. In the cases tabulated below there are more than one valve for a given vt marking. The 6gh8 family of tubes sound just as bad as the old 7199s. The 7189a power pentode is the same as the 7189 but has two pinout differences, as follows. The 6u8a is the one tube i could do without in my life. This tube has a different pinout and cannot be used in 6bq5el84 sockets unless you have verified it will work. Am i better off dishing out much more money for 8417. This substitution list should be used in one direction only that is, an industrial type to replace a standard type. Im planning on replacing the tube on my amp, and it takes two 8417 tubes. Theres no denying that the 6bf5 runs hot in those receivers.

I understand the 7189a is kinda rare, and many amps are reworked t. This tube has very low noise characteristics and heavily plated gold pins. I have a much better time now doing that, plus it extends the tube life. I just purchased a pioneer sx 800 receiver from a forum member, and when it got here, one of the tubes had wiggled out of the socket, and the top is broken. My favorite tubes and their substitutes by robert h. Antique radio forums view topic tube substitution guides. The datasheet details use in ultralinear applications which magnatone used. While both tubes have the same basing arrangement, the 6ca4 has higher maximum ratings than the 6v4. Thankfully, there is a solution by implementing a simple wiring change and substituting the. This topic came up on the collins reflector some time ago with one fellow insisting they were no different than any other tube. Maybe im getting testy in my old age, but it really annoys me to read that substitutes for a 6sq7 are. For hobbyists, technicians, and others interested in construction of their own highfidelity amplifier systems. I love and appreciate tube based audio gear and own sixteen pieces of tube gear between my two reference systems.

Audio space is the manufacturer and wholesaler of various kinds of vacuum tube amplifier, including preamplifier, power amplifier, integrated amplifier, speakers and audio accessories. This tube appears to have a date code of 9108, from 1991. This is a premium version of the 12au7 made only by cbshytron. Due to the numbering schemes in use there are three variant classifications of vtxyz valves.

This list was expanded from a list here thanks to jim cross. If no replacement is shown for a particular tube number, there is no replacement and you must use original tube number to replace a defective tube. Tube substitution handbook english version aireromalazio. The el84 was developed to eliminate the need for a driver tube in radios, so it has. The jj el844 is an entirely new tube that dissipates 9 watts and is a drop in replacement for el84s in most all amps. Tubes in the tube column are directly replaceable with tubes in the replacement column. Neither is recommended as a direct substitute for a 7320 and vice versa. The 5963 has a max plate voltage of 250v while 12au7 has a max of 330v. Without a thorough knowledge of tube types and their substitution possibilities, you may be overpaying for your new or. You can safely substitute a 7189 tube for a 6bq5 sound issues aside but you might think twice about substituting an el84 for the beefier 7189. These are all pin compatable with one another, the only differences being the gain factor of each tube.

Print page need 6u8 or 6u8 substitute info the am forum. I am working on scanning and placing on this page the entire rca hb3 tube manual. Scott logo partial and the sittard factory code is etched in the glass. The substitutions on our chart are all direct substitutions and will. This rare 1959 amperex 7189 tube is a higher voltage el84 6bq5 tube type. This tube has a specially designed cathode which can withstand long periods of time in cutoff without hurting the tube.

Other equivalent tubes are the 7189 and 7189a, an extendedratings version of the tube for. Both sovteks have the thin shiny pins these are known for. These are all low microphonic thanks to their rigid mica supports. In the ge book, the 7189a has a different basing all its own. Very durable, great tone, long life 3000 hours compared to a 100s of hours for new production el84s. The bold listings are shown as equivalents in a tube manual, and could probably be sustituted without any changes other than rewiring but check dissipation rating for power tubes. Rca highfidelity amplifier circuits booklet hfiio 838 x 1078 pages. A friend of mine would like to retube her gibson falcon. For the love of physics walter lewin may 16, 2011 duration. Please note, while the 7189 is just an upscale el84, the 7189a is a higher power tube with a different pintie. This is a suitable replacement for any 6bq5 el84 cv2975 e84l 7189 tube type. This 1960 tube caddy below book also includes all tube numbers from all over the world.

The el84 is a thermionic valve of the power pentode type. It should be noted that besides the 7189a, there is a 7189. The 7189 may substitute safely for a 6bq5, but not vice versa. Discussion in amps and cabs started by straticus, feb 18, 2009. But ive accidentally had a 6be6 in place of a 6ba6 same as the 12s with different filament voltage and the be did not work at all. Introduction lindsays technical books catalog description. The kwm2a uses a bunch of them, and theyve never seemed to last worth a damn.