This is the tube I like best with my MCTH, but the one I have developed an intermittent buzzing / wheezing / whistling and became very microphonic a while back. I went back to the stock EH, but would like try the Funken again. I've only bought tubes once in the form of a grab bag of 6922 equivalents from another baffer. I've looked online the plethora of sellers out there is rather intimidating. This tube is also on the pricey side and seems to be most often sold in matched pairs. Obviously I only need singles for the MCTH. So if anyone has any spare new or used Telefunken E88CC of any vintage they want to get rid of, and is willing to ship to Asia, give me a shout. Or if you can recommend a reputable seller with singles, I'd appreciate it. Thanks in advance!