I have for sale a quad (4 tubes) of the EI prewar 12ax7/Ecc-83 smooth plate tubes.. These tubes are labeled Audio Research corporation, as they had used these tubes in there products back in the 1980's The tubes are tested on an Amplitrex AT-1000 reference tube testers auto setting.
If you need more than 4 tubes email me and we can discuss options.
These are early 1980's vintage NOS (new old stock tubes) that are part of a 100 tray factory lot. Because the tubes are part of a factory tray they were more than likely all manufactured on the same day. In case you are not aware of the story of these tubes... EI purchased all the factory tooling from Telefunken and basically made an exact copy of the famous Telefunken smooth plate 12ax7 using original Telefunken machinery. These are the highly desirable smooth gray plate 12ax7 tubes with the halo getter just like the famous Telefunken 12ax7 they are modeled after.
These pre-war (Yugoslavia war) EI tubes are known for their excellent sound and reliability at a much lower cost than buying a Telefunken tube. The tubes in my ad were produced in the early 1980's.
Condition wise...The tubes have always been stored in a smoke free, temperature controlled environment. The lettering on the tubes is strong and it says Audio Research corporation and it has the ARC part number for the tube, they also have the EI factory markings and pinched EI glass design.
The silver flashing material on top of all of the tubes have some dark spots/discoloration caused in the manufacturing process.
The tubes pictured are from the 100 tray lot and are an example of the lettering. The tubes will come in generic white tube boxes. You get four tubes for my listed price. Audiogon does not have a New old stock category so they are listed as mint condition because they are NOS and unused.
All the tubes are tested and listened to for noise on a state of the art, Amplitrex AT-1000 tube tester using the auto mode. The test results are 95/95, 95/95, 90/95,100/100 for emissions where anything over 85 is considered excellent for a NOS tube, the important GM rating will be well over 100 for all the tubes in both sections.
I've had a quad of these tubes in one of my ARC preamps for awhile and I'm very impressed with their excellent sound and low noise. Like most NOS European tubes such as Mullard and Telefunken the tubes flash when energized and this is normal for this tube type, due to the special filament design.
The tubes are from the estate of a long time audio research employee.
Shipping will be $ 3.75 shipping via USPS first class. I carefully box, all my tube shipments. NO INTERNATIONAL SHIPPING. Continental USA sales only
If you have any questions about these (4) Audio Research labeled EI prewar 12ax7 tubes please email me thanks.