12AU7 Amperex / Philips / Philips Miniwatt Holland PHILIPS ECC82 – 12AU7 – PHILIPS ECC82 – 12AU7PHILIPS ECC82 – 12AU7 – MATCHED PAIR – PHILIPS ECC82 – 12AU7 (labelled IEC) lively midrange. ECC82 Philips 12AU7 Mullard Blackburn. Made in England, Gf2 B0B3 codes, ECC82_12AU7_Philips. Ribbed plates, ring getter halo, one side hole.
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This page lists all of the 12AU7 tubes I currently have in stock, including all industrial and European versions. It is a long page, use your scroll button and scroll down the page to see it all. This list is organized now by each vintage tube manufacturer. Be sure to scroll to the bottom of the page to see every brand we have. These are extremely high demand vintage tubes, so I have these listed on their own page, as my stock changes rapidly.
If you need a quantity of these tubes, or have specific needs such as matching, special construction, etc. Stock levels with ecf82 quantity on hand shown are being phased out as we update inventory.
ECC82 Philips 12AU7 Mullard Blackburn
The only exception to this will be very scarce tubes where we typically will only have a small stock on hand. Of course, any time you need a large quantity of tubes of any type, is is a good idea to email us for a stock check first. We can match most small signal preamp tubes on a Tektronix curve tracer.
Scroll down to watch a brief video about matching, below. This runs the tube at full rated plate voltage, and plots the curves at 10 different grid bias levels. The most accurate method to test tubes, the curve plots can actually be compared to the printed examples for each tube type that appear in the manufacturer technical data sheets and books. Each triode of a 12AU7 can be compared both internally balanced and to other tubes matched.
Prices listed below for “matched pair” tubes are Gm matching only, and there is no additional charge for Gm matched pairs. For most uses, Gm matching is fine. Curve tracer hpilips would be recommended if the tubes are to be used in a phase inverter circuit, phono or microphone preamp, or other critical or demanding circuit. Curve tracer matching is an additional special request item and is charged in addition to the listed price of philipd single or matched pair tubes on this page.
Get two full years of warranty coverage for these tubes!. Can’t find a particular tube?
Return to the Audiophile tube page. Return to the Main tube page. Return to the Home page. The 12AU7 is a medium-mu twin triode miniature glass tube. In most circuits it is used as a class A amplifier per triode section.
This tube has been, and still is, widely used in the preamplifier stages of high fidelity audio equipment, musical instrument amps, public address equipment, and broadcast equipment. It was used in so many different types of equipment that the vintage versions of this tube are still available phipips too much searching.
Here is the list of what is available in the 12AU7 family: The common USA version of this tube. The 12AU7 can only be used in parallel filament circuits. Like the 12AX7, this is not a hassle since virtually all hi-fi tube amps are of the parallel filament design. The early RCA version has ribbed flat black plates with a top getter and a white label. This is an amazing tube, one of the best USA 12AU7 tubes ever made and we have a good stock of these. Still available, and still a bargain since everyone wants the “cleartops”: These “cleartops” are currently the hottest selling 12AU7, and are still a great buy at current prices.
I predict in 5 years it will be as hard to find as the Telefunken smoothplate, and just as expensive! The s new logo version and the late ss version with the white label of the RCA 12AU7 has greyplates and a top getter. The GE versions pretty much always used greyplates and a top getter for this tube. The numbers are etched into the glass with a pattern of dots below the number. Don’t miss trying the “organ stock” 12AU7 tubes that were sold to organ manufacturers.
These sweet tubes were screened for audio use in organs, and have the organ brand on the label. Usually sold at bargain prices because of the re-branded label, the RCA cleartop and Raytheon blackplate versions are a great find! Tung Sol made an early “blackglass” version in the late s, which hides the inside of edc82 tube from view, and is very rare; later Tung Sol 12AU7 tubes look like early RCA greyplates inside.
All of these vintage tubes used a chalky label paint, and often the tube label is smeared or partially rubbed off. This does not indicate use or poor quality. Rather, it is an indication of philps genuine vintage tube, and all of these are excellent quality. This is the European version of the 12AU7, and is identical to it.
The brands in demand are Telefunken, Amperex, and Mullard. Telefunken tubes have a diamond shape molded into the philipw of the glass. Both ribbed plate and the more famous smoothplate types are available, just like the 12AX7, but are being hunted down and soon may be an endangered species.
Amperex and Mullard have eccc82 date codes etched in the glass near the bottom of the tube.
The most popular Amperex are the Holland made Bugle Boy series, with the tiny cartoon tube blowing a bugle on the label. They later went to just a white label that said “Amperex”, and then after that used the orange label with the world logo.
Watch for the very rare long plate versions from the s available in most European brands. These had narrow plates that were about 3mm longer than the s and later versions.
The earliest had square shape top getter elements, late longplates have a halo top getter.
Even rarer are the Mullard and Amperex made CV longplate square getter tubes, made only for the military. Most of these early Mullard tubes can be spotted not only by the date codes and longplates, but by the distinctive “wrinkle” glass, where the surface of the glass tube is not smooth but rather has tiny wrinkles or sometimes an eggshell texture.
These are all tubes of unequalled quality, and are worth the high prices they are commanding these days. Even used ones will ;hilips away any of the trashy tubes in production today. Vintage versions again used the chalky paint, and frequently the labels on any of these tubes are usually smeared. Another rarity is the Amperex Bugle Boy with thhe treble clef sign next to it on the glass.
These audio screened tubes were only made from about phi,ips are worth the extra cost in their superb sonics. Simply an amazing tube. Amazing both because it sounds so incredibly good, and amazing how rare it is today. The s vintage with the long plates and D-getters are to die for. They are among the best sounding and rarest 12AU7 around today. Don’t miss the s halo getter version of this tube, as well.
They sound nearly as good as the D-getters and are usually half the price. Very few dealers ever have the of either type in stock, well worth seeking out and worth the higher price. We philipa to keep a few of each type in stock, but it is not easy.
Better buy them when you can find them! A military specification version of the ECC These are usually found in Mullard or Brimar versions, but I have seen Siemens as well, and some made by Amperex. This tube was made into the s so careful selection needs to be made.
The best are the Mullard and Amperex longplates from the s, which look identical to the longplate ECC Ei Yugoslavia made a nice smoothplate version into the late s which sounds surprisingly good despite it’s late vintage “East Europe” stigma attached to it. Overall, these are a step up from the standard ECC82 tubes, since they have military specs.
This is a military spec tube. These are all low microphonic thanks to their rigid mica supports. Older versions have phipips third mica spacer near the top. These “triple mica” versions are in great demand today. These vintage tubes have just started to become a hot item, as NOS stocks of the West Europe types become harder to find.
These tubes can withstand many on-off cycles and mechanical shock without a problem. This can be both a military spec tube and a premium industrial tube. Pjilips, the military versions will be marked 12AU7WA in addition to having etched in the glass.
The older vintage of these tubes are usually blackplate with the extra “triple mica” spacer at the top. GE made this in their 5-star line for broadcast. These are excellent step up tubes in the 12AU7 family, when you can find them!
Look for super rare triple mica versions from Mazda, Siemens, and Mullard, some with silver plates. Among the best 12AU7 tubes ever made. This is a nice industrial type which is nearly identical to the standard 12AU7.
Tube Classics – Philips Audio Tubes
RCA made a nice blackplate version of this tube, Sylvania has a gold pin version, and GE has it in their 5-star broadcast line. The plate voltage rating is a little lower than for a 12AU7, ohilips for most applications, it will work fine.
It has a rugged cathode and should be long lived, similar to the Watch this tube, as it is plentiful now and prices are low. As audiophiles discover it, the rush will be on! This tube was mainly manufactured for IBM and other computers in the late s to mid s. Sylvania and GE blackplates are considered the best of all with this tube.