An EV Re20 into this thing sounds monstrous and totally "euphonic". Thanks - Will be back. NOS RCA 12AX7A 7025 ECC83 12AX7 USA TUBE CREAM OF THE CROP HIGHEST EMISSIONS!
NOS RCA 12AX7A 7025 ECC83 12AX7 USA TUBE "CREAM OF THE CROP" HIGHEST EMISSIONS! Tube packaged very well, thanks a bunch!! The real deal RCAs, item as described.... Above and Beyond, my expectations!! During past month Mar 23,2016.
During past month MAR 05,2016. The product is perfect and works great. Sep-27-15 02:16:17 PDT. Dear tubemuseumusa, Thanks for one Beautiful RCA 12AX7.Tubes that my amp collection(and my ears) crave! RCA 12AX7A ECC83 12AX7 USA TUBE for Fender Tweed Champ (#290497360769). Historic Tube Museum, Tuxedo Park, New York Established in 1928 as a premier research facility in Tuxedo Park, New York, that attracted such brilliant and most visionary minds of the twentieth century - Albert Einstein, Werner Heisenberg, James Franck, Niels Bohr and Enrico Fermi to name a few. The Tuxedo Park lab attracted these top-flight scientists who experimented with audio, sound, time measurement, and radar (first klystron tube was invented here). RCA 12AX7A ECC83 12AX7 USA TUBE for Fender Tweed Champ (#230492987646). Tube Museum is the best source of tubes on the net by far. Well, get rid of those! Here is a AMPLITREX DIGITALLY TESTED QUALITY 12AX7A single tube that will end your search for the Quality you would expect from a Premium tube in your ultimate HI-FI AMPLIFIER or Musical Amplification system. USUALLY THE RCA 12AX7A BEING CIRCULATED FOR SALE HAVE VERY LOW mA EMISSIONS.
Each measuring only 0.4mA, 0.5mA, 0.6mA average! 8mA to 1.2mA (100%mA) and 1,500 to 1,600 (up to 100% Gm)! 1960's NOS RCA Made in USA. 12AX7A = A LOW NOISE 7025.
Made in USA in the 1960's WITH STOP-SIGN. Picture of one of the RCA "STOP-SIGN" 12AX7A rectangle plate "old-print" series with small sweet-halo for detailed sound! PRINT WILL VARY from partial to almost none, as this is a multiple item listing. Fender Twin Reverb: The circuit used is commonly known as the AB763 circuit. Fender Twin Reverb amplifiers use four output tubes, of the 6L6GC type.
They use six preamp tubes, consisting of four 7025/12AX7A types and two 12AT7 types. The 12AX7A/7025 is a lower-noise version of the 12AX7.
12AX7A/7025 RECOMMENDED BY FENDER IN THEIR ORIGINAL TUBE COMPLEMENT. Fender "Twin-Reverb" 6L6GC x 4, 12AT7, 12AX7 (or 7025/12AX7A), 7025, 12AT7, 7025, 7025.
Fender recommended the "7025 = 12AX7A" version in their 12ax7 preamp tubes. GREAT FOR MUSICAL INSTRUMENT AMPLIFIERS THAT COME WITH 12AX7 TUBES! RCA labeled 7025 tube = LOW NOISE 12AX7A QUIET tube. RCA labelled the SAME tube either 12AX7A or 7025, they are the same tube! 1.25 = 1,250 GM.
Although commonly known in Europe by its Mullard-Philips tube designation of ECC83 , other European variations also existed including the low-noise versions 12AX7A or 7025, 12AD7, 6681, and 7729; European versions B339, B759, CV492, CV4004, CV8156, CV8222, ECC803, ECC803S, E2164, and M8137; and the lower-gain low-noise versions 5751 and 6851, intended for avionics equipment. CERTIFIED ULTRA-LOW-NOISE SPECIMENS with the HIGHEST mA and Gm! TubeMuseum tested tubes takes the guesswork out of the process of selection delivering you the best Audio tubes that there possibly can be.
What I like about this tube is that it's a Matched & Balanced Triode Single-Tube with Uniquely closely Matched Plate-Resistance (Rp) & matched Tube-Gain (Mu). Don't take foolish chances with Other offers with weak 50% TO 70% EMISSIONS (mA) and only 900 to 1200 Gm, if lucky! Take a LOOK at the ACTUAL AMPLITREX AT1000 "TUBE MUSEUM DIGITAL-PROOF" BELOW!These tubes all have VERY HIGH iP/mA which is really important to insure a LONG-LIFE of your 12AX7A tube! Did you know that weak 12AX7 preamp tubes put an unnecessary strain and SHORTEN the LIFE of you other tubes in the circuit? If you want the "CREAM OF THE CROP" the BEST there can be, this is it.
ACTUAL SIDE 1 of TUBE # 1. THE "CREAM OF THE CROP".. With Zero (0) Heater-to-Cathode leakage, and ZERO (0) mA Gas!
ACTUAL SIDE 2 of TUBE # 1. THE "CREAM OF THE CROP". (1.2mA = 100% and 1,600 mA/V = 100%).
ACTUAL SIDE 1 of TUBE # 2. ACTUAL SIDE 2 of TUBE # 2. ALL RCA "STOP-SIGN" 12AX7A rectangle plate "old-print" series.ALL TUBES have ZERO (0) Hearter to Cathode Leakage (H-to-K) & ZERO (O) mA Gas! TIGHT PLATE RESISTANCE and MATCHED TUBE GAIN ON BOTH SIDES! TUBE 28: 1,500/1,300 mA/V. TUBE 29: 1,500/1,300 mA/V. TUBE 30: 1,400/1,300 mA/V. Dizza (PRINT PARTIAL / WORN OFF). JUST ADDED AUGUST 27: (NO BOXES - COMES IN WHITE BOX). Remaining tubes test similar to above.. TESTED AT REAL-WORLD POWER LEVELS ON AMPLITREX AT-1000 in Fixed-Bias Mode. Tested on Amplitrex AT1000 Digital Tube Test System.
Rp or plate resistance is the second most important parameter as it directly affects the output impedance of the preamp. Circuit designers are looking at Mu primarily, Rp next and we hardly care about Gm at all. Why then do most vendors measure Gm and Gm alone? Because most testers only measure Gm!No commercial tester ever measured Mu either. Until the AMPLITREX AT1000 was introduced. And even the Hickock, treasured for measuring Gm, doesnt measure it meaningfully (due to current dependency), accurately (due to calibration difficulties) or consistently (due to internal circuit drift). This tube is known for excellent performance, smooth highs, outstanding 3-D holographic soundstage, lots of open-air, inner detail, and overall perfect resolution and balanced sound. We do not low declare and we insure for full value.
All sales AFTER 14 days are final. Questions from other members : 12AX7 ECC83 12AX7A 7025 TUBE for Fender McIntosh. Hi, Could you please tell me the difference between the 12AX7 and the 7025? Fender specifies 7025 tubes in their later amps.
I have seen tubes labeled both 12AX7A/7025 on the same tube. The 7025 and 12AX7A data sheets both say... For high-fidelity audio-amplifier applications critical as to noise and hum... The 12AX7 data sheet simply says "For use in mobile communications equipment" the 7025 was a special 12AX7A for instrumentation, having low microphonics and noise characteristics. The 12AX7A was an'improved' 12AX7.Although commonly known in Europe by its Mullard-Philips tube designation of ECC83, other European variations also existed including the low-noise versions 12AX7A, 12AD7, 6681, 7025, and 7729; European versions B339, B759, CV492, CV4004, CV8156, CV8222, ECC803, ECC803S, E2164, and M8137; and the lower-gain low-noise versions 5751 and 6851, intended for avionics equipment. Tubes that my amp collection(and my ears) crave. The item "NOS RCA 12AX7A 7025 ECC83 12AX7 USA TUBE CREAM OF THE CROP HIGHEST EMISSIONS" is in sale since Tuesday, September 16, 2014. This item is in the category "Consumer Electronics\Vintage Electronics\Vintage Audio & Video\Vintage Parts & Accessories\Vintage Tubes & Tube Sockets".
The seller is "tubemuseumusa" and is located in Tuxedo Park, New York. This item can be shipped worldwide.