MATCHED QUAD of 1960's, super early production RCA 12AX7A (the 14 mm / 1960's 7025 grey plate design).
If you're shopping for a matched set of these early A-type 14mm RCA's, rest easy -- you've just found the best on eBay, grab them soon -- as they will sell quickly (see my 100% , 5 star feedback on 12Ax7A's )..... these tubes are the ORIGINAL, early version of the 14mm ribbed 4 hole plates of the 7025 type. Some of the tubes may have worn or faint RCA red ink --- all of these are early to mid 1960s -- and also have the ETCHED letters 12AX7A inside octagon frame --- genuine early RCA tube. The boxes show their age of nearly 50 years, some flaps are frayed, foxed and have slight stains from the many years of storage.
All tubes are strong, and low use. Read reports below in Exhibit A & E. Tube # 3 has a slight dark spot on flashing, it is a VERy strong nice sounding tube.
Exhibit B -- shows actual listed tube (s) under test, dynamic emissions at full load for easy reference. All (4) tubes / all (8) sides read ~ STRONG 120% .
They test (and sound) strong, quiet and were current matched (balanced plates) on a 2nd lab tester at full plate, fixed bias circuit, at 250V. They were played with audio and sound great!
Study the test reports in Exhibit A, C, D & E for detailes on these.
Quite old tubes, low hours, they were amongst low use spares from early HiFi estate. Just throughly checked using multiple testers and played with music. Working well; quiet and matched, detailed and sounding great! Guaranteed no problems, and REALLY fast shipping, in the mail usually same day, with a tracking #. See my detailed, 100% feedback on tubes.
These are the real McCoy, and you should not pass up the best. The most throughly tested, closest matching QUAD you will see anywhere! Please check my recent 100% feedback above on these RCA 12Ax7A's -- all extremely happy buyers!
There are many choices out there.... RCA was the leader. More than half of a century has passed since this set was made. RCA masterfully made their dual triodes -- they literally wrote the book for so many designs. Imagine back then ... to the 50s and 60s -- paint and metal thicker, and unforgettable industrial design magically harmonized with the arts.
Whay are old tubes better? Companies and workers had time to do it right, and the materials were pure. Originals are simply better ... right down to the molecule.
They are what your amp / preamp was born to run. And without the timeless quality these will render -- your rig may not sound it's best.
We've all been there. Happy already with the sound we're getting. How could it get any better? Then tired of de riguer, we finally make a tube swap .... Wow.
So how could they make such a difference ?!!? The tube, particularly at signal stage, gives equipment much of its inherent personality, clarity and picks up all the detail. It's the active device, the part that does all of the work and receives all the wear.
Very hard to find gems like this. Compare with other offerings ... and then study these .... the high fixed bias GM (mutual conductance, aka mhos) and cool matching boxes --- you'll see these are the best online and will sell quickly (last early 60's quad sold within 12hrs!)
Dealers all over can no longer find tubes like this. For guitar amps -- they are some of the very best tubes you can use ... this QUAD; is totally matched. Plates are incrediblely close, strong functioning at full operating 250 volts eP -- .. they're are also all very close dates of production (see exhibit B,C & D for dates -- all early 1960s). This era kicked off the start of the 14 mm low noise plate design ... They're the very earliest incarnations of the 12Ax7A .. all (4). The 1960s encompassed RCA's first generation of the 12AX7A (industrial version was 7025) -- they stayed the same late 50s til the end of the 1960s (end of the decade). (see exhibit C,D,E).
Cosmetics are very nice .... flashing is very shinny & thick, idicative of gentle, low hours and a long life ahead. Study my photos, sometimes these tubes show darkness in the otherwise shinny top (it's noted on each tube's tag) - from a few hours burn in use, before packing or from the / low hours use matching procedure back in the 1960s. All tubes in this QUAD are close, and will provide a very, very long life expectancy. Sometimes the ink on old tubes have worn / missing ink & letters, RCA's always also have RCA's signature 12AX7A etched right into the glass (see exhibit B,C,D). Strong and super quiet (no microphonics), no gas or shorts. They were carefully checked and played with music -- for full details please read the reports in exhibit A,C,D,E below for date codes and exacting test results.
Again, this is the super cool early version of the RCA 12AX7A, aka any place you'ce got for a 7025 ... you don't see A's ---- this old ... pretty darn rare ... if you're collecting or planning to use in your old Fender or hifi amp or preamp -- and it calls for the low noise ECC83 / 12Ax7A / 7025 --- here you go... probably the earliest & best matching set you'll see on here for a very long time - hefty grey ribbed plates and 1x top halo and super thick mirror flashing . With closely matched ip & mhos and close dates -- you just don't see'em like this very often.
Study the included tube test results in photos and you'll see just how nicely fussed over, clean and well tested these originals are!
If you're currently a user of modern tubes then these will make a world of difference in your sound. They are a real upgrade and a treat for your ears -- an exciting purchase if it's your first time with vintage tubes. They will sound cleaner, clearer and more overall detail / presence you can really hear in any gear.
These are the real thing made in USA ... from the very early 1960's! They sound wonderful and as before, will sell very quickly (nice one's such as these are usually sold within 12hrs of listing!).
Buy Now to avoid a bidder’s war.
Check my 100% feedback (check over what buyers have to say ... they love these vintage US tubes and I get allot of repeat customers, who don't hesitate to snap these up) ... always super fast shipping, and always super safe double box packing !!
100% happiness assured on all tubes and old audio items. Guaranteed NO DOA.
