Couple of days ago one of my Siemens 7308 tube,stop working.When I open the cdp, I notice its loose,Anyway I am thinking to buy new tubes, any recommendations? I saw that music direct has some Sovtek 6922, 6dj8, 7308,ECC88.Anyone tried this Sovtek tubes?Thanks in advance.Jay
Jay, try a pair of Amperex PQ gold pin 6922's or their 7308's... One of the best matches for the 4000 you will find. Rule out the Sovtek. If you are looking for an affordable 6922, try the new JJ's...real affordable and sound just great. Enjoy!