6N23P Reflektor Holy Grail 1975 SWGP Silver Shields Matched Pair 90%

One matched pair (2 tubes) rare 6N23P Reflektor "Holy Grail" SWGP Silver Shield (ECC88 / 6DJ8 / E88CC / 6922 / CCa), produced at the Reflektor plant in Saratov, USSR, in 1975.

These are true gems: low-noise, carefully selected, and precisely matched, two pairs in stock, the measurements are written on the boxes, tested with 100V on anodes and -1.5V on grids.

Very strong examples, over 90%, perfectly balanced.

Tested on a calibrated Tesla BM215M for plate current, and additionally checked in a preamplifier for hum and noise.

Original 6N23P Reflektor print markings are slightly faded.