For Sale: Siemens E188CC 7308 Old Siemens 1965 Matched date codes and printed serial numbers. I bought these as NOS from an old German collector formerly in the German Military. The German military had pretty high standards, and the data here reflect this. These have the earliest date codes for E188CC; and, I have never tested a better pair.
Matched Data in mutual trans-conductance (MTC) and dynamic emission (DE) (both are my calibrated testers):
Hickok TV-10 professionally calibrated and well validated. Min is 7,500 and NOS is 12,500
Eico 666 (Min is 70 and NOS is 110-120). Max is 140. These bang the meter all around.
I have collected a few pairs of these. I have never tested a better pair. Many of you know that meter-banging NOS tubes sound special. These will last a very long time. Thanks for looking. Extra-USA--please contact me first.
Edited by nurxhunter - 5/16/14 at 9:06pm
Read more with pics at http://app.audiogon.com/listings/tubes-siemens-e188cc-7308-nos-grey-riser-german-military-g-phi-zero-white-label-rarest-e188cc-2014-04-27-accessories-19380-west-chester-pa#Q7a8hcH2lBzP8QEz.99