Spectron Musician trun on noise / tweeter hiss


My Musician III SE MK2 with the vcap / bybee upgrades was just delivered and after setting it up and hitting the power switch a cracking static was momentarily heard from my speakers. The same was true when the power is turned off.

I realize that most amps generate an audible hiss that can be heard when you put your ear near the speakers tweeter, but the Spectron seems louder than most.

Do other owners share the same experience??
tmaple
or maybe you can just turn on amp with just speakers hooked up and no inputs to see if the hiss disappears (can this be done without creating another problem?). then start plugging in components one at a time until the hiss appears. you know...troubleshooting.
Unfortunately the hiss remained with ONLY the speakers connected to the amp. The unit has been packed up and will be returned to the manufacturer for analysis.