Opinions on VTL preamps

no problems in last six months.It will make horrible noises if i forget to turn the rest of the system on before the amps.may be they where loaded up or something.they work fine now and keep getting better.I figured it was the speakers polarity.Its very dark in my listening room,ecept for the glow from all the tubes.

I have a 5.5 and a st150 that I was bi-amping with a classe ca 300 on the bottom driving b&w802n's .loved it so much thought i would get rid of the classe and got the phono 2.5tp and 225t90 mono blocks last week. I have had no problems until hooked up the mono blocks.put the st150 on the b out put for the rear and the monos on the A output for the front (bi-wireing).no need the classe bass is fine without no smear.About 1 minute into it the right side starts making a screaching noise then stops I dont know what it is but after another 10 sec it stops.So last night i have the system running for about 3 hours then shut down everything.Then this morning i go to power up the amps and then the screaching starts up on the right as usual for but now The st 150 starts in with the same crap only more anoying and louder like someone dragging a piece of metal across the blackboard. so I unplug the st 150 and hook up the ca 300 to see if maybe its the pre-amp. sound great except the 10 sec while the 225s are warming up. So I think its the st 150. I enjoy the sound of vtl,but hope its just a bad tube and not a transformer, i have spare tubes but i dont want to turn the thing on to try to bias until i figure out what that noise is.Anybody guess what is going on with the right mono and st150?

Just blew up the classe guess its the 5.5.

Found the problem, we had my listening chair delivered on friday. And My wife said they unpluged one of the speakers by accident, when I put it back i connected the neg to pos.So nothing wrong with the 5.5 ,classe or st150.still a little buzz for a couple seconds on the monos though,But once they are warmed up the sound great.