$275 Per Pair. True NOS--NIB--not used except to test and listen for ~60 min to make sure there were no variances. Made in 1965, 1 month apart.
They are PERFECTLY MATCHED in data right at meter-peg!!!. 120% above NOS. Tested on my resolving EL84-SEP headphone amp (each tube separately as the SEP preamp tube) and CJ Classic 60 as a pair.
Given total silence in microphonics on these systems, I will warrant them as Phono Grade, and per data, platinum triple-matched.The A-0-1 (A-Phi-1) Siemens represents the epitome in sound quality. Holography, fatigue-free extended highs (sparkling is an apt word) and the BEST tight bass of any E88CC. The QC/QA and long life are also outstanding and equal to their Munich competitor.
I have found surprising synergies between tubes and interconnects--indeed--I now believe that cables matter, especially in combinations that are synergistic with certain tubes!Hickock TV-10D/U is calibrated with 12,500 Gm as NOS and 7,500 Gm is the MIN. I use a reference tube to make sure it's in calibration.
The data here are as perfect as can be for these rare and highly regarded Siemens A-Phi-1 species of E88CC/6922.
TUBE 1 A-Phi-1/=/5K is 15,000/15,000; Tube 2 A-Phi-1- A-Phi-1/=/5J is 15,000/15,000ALL DATA ARE +/-2%--THE PRECISION OF THE TESTERS.
***They PEG MY EICO dynamic emission calibrated METER AT GREATER THAN 140%/140% of NOS-spec.****
140% is THE HIGHEST NUMBER ON THE EICO 666 METER, WITH 120% for high-test NOS tubes, ****No inter-electrode leakage (IEL) whatsoever--and the EICO 666 is known to be as good as the best testers in this regard. IEL can relate to gas--and the Hickok TV-10D/U confirms zero gas and a rock-steady life test).****
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