I had this problem with my twin reverb but it was after a long use.I didn't bother about this sound as I was getting it out for sale.I think it would be better if you show it to tech.

I had this amp for about 4 months and it stayed it decent shape, but now it has just started going downhill. It wouldn't turn on for about 5 minutes after you flipped the Switch on. Can anyone suggest me what might be the problem?

I have never found OR50's treble control being ineffective.There is nothing that makes this amp sound bad.I can say this is the best amplifier I have played but little bit costly.But If I am getting something best then money doesn't matters for me.

As far as I know it fits into point to point category.Do you have Orange AD30HTC? I played one at my local shop , it sounded great.