Hi, I was wondering if anyone else has experienced this rustling/crackling noise I'm getting from their factory built Dodd 6h30 buffer. At first I suspected a tube gone bad but after replacing several tubes including brand new ones I was still hearing this noise. Sometimes it appeared right away and with other tubes it played fine for awhile before the same noise started. The noise is similar from tube to tube and doesn't seem to effect the sound quality, no distortion even as you play louder. Any ideals or suggestions? Thanks, Rod