RARE Telefunken ECC88 / 6DJ8 - Laboratory Grade - Very Well Matched & Balanced (3.9%) Pair NOS E88CC 6922

Very rare, impossible to find, Laboratory Grade Telefunken ECC88 / 6DJ8 tubes.  This pair is very well matched, all 4 triodes test very close to each other. These tubes were hand selected in the factory in Germany for their superior characteristics and ultra low noise. These are excellent tubes for ultra-sensitive microphone preamp applications.

They have the standard diamond mark imprinted on the bottom of each tube.

These tubes sell very quickly on the few occasions that they become available.

I personally tested these tubes on my recently calibrated Hickok 600a tube tester.  The results are as follows:

12,375/12,750
12,250/12,375