When you clean the preamp with air...don't remove the tubes first. You would blow dust into the pin connections if they are empty.
Sonic Frontiers Line 3
Recently acquired Line 3. Has Sovtek 6922s, sounds very good. What tubes would others recommend as replacements? Also, when I removed the cover to place tubes in sockets, noticed circuit boards covered in dust. SHould dust be removed; from power supply unit as well? How to remove dust, use artists paint brush. Thanks for into.