2J27L MATCHED QUAD 1% tolerance NOS/NIB same date, tested RoetestV10

Description

Price is for a matched quad of 2J27L soviet NOS/NIB, 4 tubes with same or very close electrical parameters, same date from 1985, max. 1% spread plate current and transconductance.
2J27L=
2Ж27Л (russian letters, cyrillic script)
Tested on RoetestV10 professional tube testing system, very good results for currents, transconductance, vacuum etc.,  see examples of results in photos.
Results seen in photos are examples, not all quads have same parameters but all are in factory datasheet range: 1.3 - 2.5mA for plate current and 1-1.5mA/V for transconductance but
for this selection we removed weak tubes under 2mA and gassy tubes, even a little gassy that are pretty good tubes
.
From our experience (tested few thousands) for this kind of tubes about 25% from them are under 2mA plate current, not bad tubes but not good enough for this selection.
2J27L is is a direct heating tube, designated as RF/IF stage pentode but
works excellent in audio, is quiet and non-microphonic, low distortions
, very good linearity in the highest part of curve.
Very low heater consumption, only 125mW (for EF86 consumption is 10 time higher).
Condition for test, as seen in test protocol: 2.2V/120V/45V/0V, typical expected results (100%) 1.9mA / 1.25mA/V.
2J27L is known as an equivalent - but not direct replacement - with 12J1L, 4J1L, RV12P2000. Any replacement between mentioned tubes must be done taking care of base/pin connection, heater type and heater voltage.
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.
Just ask if you need more details, we'll answer fast.
We send next day after payment, priority airmail with tracking number. Please be patient with shipping time that can be surprisingly fast or disappointingly
slow, depends only by post services.