12sq7 tube data book

Tube 12sq7 or rohre 12sq7 id2638, double diodetriode, octal int. It has much higher transconductance, and much lower dynamic plate resistance than a 12ax7. Vacuum tube 12sq7, diode, dual, triode amplified parts. The part number is the sku shown for the product, the item id is a 6digit numeric unique to each item. Free vacuum tube data sheets free vacuum tube substitution. 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. This list was compiled from the cv register and several other sources. This is the second in our ongoing what its worth series that keeps you up to date on whats hot in antique technology. A few specialquality tubes did not have a standard equivalent, e. Use this form to quickly add products to your cart by part number or item id. My guess is that there were lots of 12sq7s replace in the past that were just fine. Picture tube characteristics and socket diagrams occupy pages. Virtual valve website the complete 1951 sylvania tube catalog 15mb here are tube socket dimensioned drawings. The 12sq7 vacuum tube is a metal type used as a combined detector, amplifier and avc tube in acdc radio receivers.

I am working on scanning and placing on this page the entire rca hb3 tube manual. Nos tube specification sheet nos tube specification sheet. Fortunes were made and lost, empires built, epic patent battles ensued, all of which resulted. The 12sq7 detector tube was identified as having a faulty filament circuit with a momentarily intermittent filament connection. Vacuum tube 12sq7, diode, dual, triode combines two diode units and a. This is a list of vacuum tubes or thermionic valves, and lowpressure gasfilled tubes. The text is intended to be basic enough for a nontechnically educated person to grasp easily, yet it includes enough theory for a technician or engineer to learn more.

Detector circuits part i, august 1945, radiocraft rf cafe. Tubes in the tube column are directly replaceable with tubes in the replacement column. The data set book series 7 books all formats kindle edition from book 1. Is this the latest tube data for the 666 tester is this data interchangeable with the 667 the tester i have. We also have the 6sc7 that differs only in heater rating. Arranged by subject category, then alphabetically by title. Numbers shown in light blue background are coldcathode tubes. To ensure this was the problem and without having a replacement 12sq7 tube, the 12sq7 was removed and a 100 ohm dummy powerresistor, roughly equivalent to the filament resistance for this tube, was used across the. The mutual conductance values listed are averages for new tubes and only for a guide. Heres a guide to the repair and restoration of radios of the vacuum tube era, about 19201960.

The 12bv7, 12by7, 12by7a, and equivalents were a class of mediumlow gain, pentode vacuum tube amplifiers using the noval socket configuration. Feb 17, 2016 the 12sq7 detector tube was identified as having a faulty filament circuit with a momentarily intermittent filament connection. In my listening experience, these 12bz7 are very, very clear articulate, and tend to emphasize treble a bit. Antique radio forums view topic 12sr7 subbed for 12sq7. Tube test data for use with the tube testers i177, i177a, and i177b note f. 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. The term all american five abbreviated aa5 is a colloquial name for massproduced, superheterodyne radio receivers that used five vacuum tubes in their design. In the cases tabulated below there are more than one valve for a given vt marking.

Radiotron model uv 200 vacuum tube rare experimental use only. I can imagine all those drug store tube testers failing them left and right. Vacuum tube 12sq7, diode, dual, triode antique electronic. The 12sc7 is a metal enveloped double triode, these valves have been used in guitar amplifiers and the ecc83 is used for upgrades. It will be noted that in this circuit, the diode load consists of two resistances having a total resistance of. My guess is that there were lots of 12sq7 s replace in the past that were just fine. I recently tested up a large batch of tubes, and two of my testers failed 18 of the 12sq7s. If the page is blank click here rca 6fq7 6cg7 datasheet. Tube 12sg7 or rohre 12sg7 id2636, vacuum pentode, octal int. Trending price is based on prices over last 90 days. Four whiz kids set out to foil the plans of a mad scientist in this early reader series.

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. 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. In my listening experience, these 12bz7 are very, very clear articulate, and tend to. Be prepared and able to communicate in case of emergency with the largest selection at.

Data from or other sources as supplied by john atwood. This 1932 rca below manual provides all the data sheet information, of the first radio receiving tubes ever made, from about 1920 to 1932. On the elenco detection is done by a solid state diode. This is the if amplifier that takes the 455 khz if amplifies it and passes it on. Tube type list the following list shows the tube types i have entered in my database, with exception of the service types e. Tube type selector switch filament potentiometers socket letter press notations data source a b l r 00a 5. But if it is microphonic, it may still be a fun tube to try in your phaseinverter position if youve got a 12ax7 there now microphony will not be a problem in the pi. These radio sets were designed to receive amplitude modulation am broadcasts in the medium wave band, and were manufactured in the united states from the mid1930s until the early 1960s.

The rear tube is a 38he7 damperhoriz output that replaces the 35w4 35z5gt and 50c5 50l6gt. The new rca reference book features interchangeability directories for tubes, transistors, and batteries. The 12sq7 combines two diode units and a highmu triode in a single envelope. March of the mini beasts, dont disturb the dinosaurs, the sky i. It is written for anyone with some curiosity about what makes the old sets tick. Heres a guide to the repair and restoration of radios of the vacuumtube era, about 19201960. To prevent damage to equipment, it would be wise to double check with a good tube manual before actually doing a substitution. 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. I then tested them in a radio, and not one of them failed to operate the radio. Although originally marketed as pentode tubes for use in early television receivers, they found.

Before the second world war radio was a revolution in masscommunication much like the internet today. Each type is intended primarily for use as a com bined detector, amplifier, and automaticvolumecontrol tube in radio receivers. The 12sq7 is a double diode triode with heaters designed to operate from the 12. It has many circuit diagrams, using these tubes and all the information, about these original vacuum tubes. If you would like to use this speed shop as your primary means of entering products, you may want to use our speed shop cart page. I recently tested up a large batch of tubes, and two of my testers failed 18 of the 12sq7 s. Herein you will find a collection of vintage engineering texts, vacuum tube datasheets, and other obsolete information, presented free of charge and without annoying advertisements. I177 series tube tester settings data antique airwaves. For books containing primarily tube data, like sylvania, ge, and rca tube manuals, see the tube data page. Although originally marketed as pentode tubes for use in early television receivers, they found additional uses in audio and radiotelephone equipment. In14 nixie tube excellent used 100% working in14 14.