6DJ8 ECC88 AMPEREX HOLAND HEARLEN BUGLE BOY  MATCHED PAIR 2 Pcs NOS

RARE -  label violin key

the code on the all tubes is GA? / triangle6E2

These tubes are extremely rare and they defined the true sound of the ecc88 amperex series and all those ecc88 tubes that came out of it.

All the tubes worked 72 hours on the tube aging device in order to measure the characteristics with high reliability. the color with which they are dressed is easily removed and every touch with it leaves traces !!!

Tested for Neuberger RPM370,Ua=100V,Ug=-1.2V Ia=16ma=100%

Ia1=16.5/16 and Ia2=16/17mA