Does anyone know a good upgrade tube from the Siemens E88CC's? They are these holy grail tubes: http://www.tubemuseum.org/ProductDetails.asp?ProductCode=SH_E88CC-1964
I am using a pair now and have a spare 1964 pair NOS in my closet and was thinking of selling/trading them if anyone were interested but I do not know the price as I were given them as a gift. I emailed Tube Museum about it and they said they are extremely rare tubes and according to Tube Museum, they are one of the best sounding 6922/E88CC/CCa's ever made. I cut and pasted this statement from the link above: NOS SIEMENS E88CC 6922 GRAY-SHIELD EARLY 1960 HOLY-GRAIL MATCHED PLATINUM LOW-NOISE PAIRS - RATED "BEST SOUNDING" # 1 6922 / E88CC / CCa EVER MADE
They sound amazing and are a HUGE improvement over my older Matsu****a 6922s and Amperex Orange Globes.
Just my 2cents, a word of caution. The tubes you have are certainly some of the best out there. The CCA's and 188s are theoretically better, however as in all things tubes the ones you have may sound better than used CCA's, etc. This is an extremely subjective analysis, "what is best". Brent Jesse has said some E88CC's measure and sound better than some CCA's(Siemens/Teles) It is really a roll of the dice and hype. If you have available funds, keep your tubes, buy the others and compare, then sell. My new Teles are are huge improvement over my Mats, Etc.