MATCHED PAIR BY GAIN 6N2P-EV=12AX7=ECC83 TESTED WITH ROETEST OTK/RHOMBUS/SILVER SHIELD
SILVER SHIELD !OTK/ RHOMBUS/
REFLECTOR PLANT
From 1985
Tested with Roetest V10, "the Rolls Royce of tube testers" [emissionlab quote], a wonderful german professional system for testing tubes, it shows everything about a tube.
From a large batch were selected lots of 2 tubes/pairs with the same gain. The gain is the parameter that mostly affect what we hear from a preamp/amp. Using tubes with the same gain lead to same sound level from each channel.
We removed tubes close to inferior and superior limits.
For tubes matched by curves or by Ip and Gm please see our other listings.
The tubes passed all quality checks - vacuum, shorts, leakage, heater current etc.
Conditions for test: 250V/-1.5V, for new tubes factory datasheet specifications: Ia = 1.4 ÷3.2 mA, Gm = 1.6 ÷ 2.65 mA/V.
All tube are from the same box with 500 tubes, all same data.
6N2P-EV could be used as a replacement for ECC83 and its equivalents, but only respecting some conditions about heating connections, please consult datasheet or ask us before buying for this purpose.
Not tested for noise and hum.
It is new, old stock tubes.
RUSSIAN TUBES – LAST LETTERS (suffix) MEANING:
V (B) or R (P) - Tubes of special, very high reliability, mechanical strength.
E - Long-life tubes with guaranteed life of more than 5,000 hours.
EV (EB) - Tubes of increased reliability, mechanical strength guaranteed life of more than 5,000 hours.
D (Д) - Extremely durable tubes with guaranteed life of more than 10,000 hours.
DR (ДР) - Tubes of special, very high reliability, mechanical strength, and guaranteed life of more than 10,000 hours.
I (И) - Tubes designed to operate in pulsed mode, characterized by increased emissivity of the cathode.
K - Tubes with high vibration resistance.
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