Soundlumia's Opinion
The "Crown Jewelry" ECC83 tube is here! If you've been seeking the reference tube sound then look no further. Designed for high end amplifiers and preamplifiers, Telefunken ECC83 tubes provide high level gain with ultra low noise and are unquestionably the vintage tubes sought after and treasured most by audio professionals and enthusiasts.
Like any other Telefunken tubes, these ECC83's are very pleasant to listen to: liquid, euphonic, with a slightly warmer midrange than many other German tubes, which makes your sound experience smooth and non-fatiguing, and all that happens on a unbelievably realistic holographic sound stage, where everything feels bigger, wider and taller. Sound texture can be felt through infinite levels of details, laying on top of each other, both in depth and in width. So your quest for superb sound clarity can end right here. Lastly, it never gets old to say that no other brand is even close to these when it comes to low noise - Telefunken tubes are "extremely" quiet just as legend has it.
Matched Pair - '65 (NOS+)
Telefunken ECC83 12AX7 Matched Pair ◇ Bottom - 17mm Smooth Plates - Berlin '65
$390.00
Professional Tube Testing
This set was tested and certified by RoeTest V11 Professional Tube Testing System with the following result:
Tube 1:
Measured transconductance(GM): 1.68/1.61 mA/V - 105%/101% (100% = 1.60 mA/V)
Measured plate current(IA): 1.48/1.345 mA - 123%/112% (100% = 1.2 mA)
Tube 2:
Measured transconductance(GM): 1.48/1.61 mA/V - 92%/101% (100% = 1.60 mA/V)
Measured plate current(IA): 1.03/1.172 mA - 86%/98% (100% = 1.2 mA)
NO shorts, leakage or gas. NO noise or microphonics.
Curve trace is also included in the original RoeTest report.
Appearance & Cosmetic condition
Silkscreen: 85% - 90%(Excellent)
Date codes:
B7205401 (B = Berlin, 5 = 1965)
B???540? (B = Berlin, 5 = 1965)
Packaging
NEW reproduction Telefunken tube boxes.
Matched Quad - '65 (Near NOS)
Telefunken ECC83 Long Smooth Plates ◇ Base Matched Quad - Berlin '65 - Same Code
$747.83
Professional Tube Testing
This set was tested and certified by RoeTest V11 Professional Tube Testing System with the following result:
Tube 1:
Measured plate current(IA): 1/1.225 mA - 83%/102% (100% = 1.2 mA)
Measured transconductance(GM): 1.51/1.66 mA/V - 94%/104% (100% = 1.6 mA/V)
Tube 2:
Measured plate current(IA): 0.94/1.045 mA - 78%/87% (100% = 1.2 mA)
Measured transconductance(GM): 1.46/1.53 mA/V - 91%/96% (100% = 1.6 mA/V)
Tube 3:
Measured plate current(IA): 1.015/1.06 mA - 85%/88% (100% = 1.2 mA)
Measured transconductance(GM): 1.5/1.53 mA/V - 94%/96% (100% = 1.6 mA/V)
Tube 4:
Measured plate current(IA): 1.165/1.045 mA - 97%/87% (100% = 1.2 mA)
Measured transconductance(GM): 1.56/1.51 mA/V - 98%/94% (100% = 1.6 mA/V)
NO shorts, leakage or gas. NO noise or microphonics.
Curve trace is also included in the original RoeTest report.
Appearance & Cosmetic condition
Silkscreen: 90%(Excellent)
Date codes:
B9105801 - Tube 1 (B = Berlin, 5 = 1965)
B9105801 - Tube 2 (B = Berlin, 5 = 1965)
B9105801 - Tube 3 (B = Berlin, 5 = 1965)
B9105801 - Tube 4 (B = Berlin, 5 = 1965)
Packaging
NEW reproduction Telefunken tube boxes.
