I have for sale a Holy Grail Reverb with the correct P/S. It intermittently works, you need to unplug it and then plug back in a few times. Then it will work until the power is shut off, then it may or may not work next time. I bought it used from Craigs list and it had the wrong power supply. I bought the correct one but it does this. I assume it was from the wrong supply being used. I did a Google search to see if there's a fix. It's a commonish problem but as far as I can tell it's not repairable. It has Velcro and scratches a-plenty. I will post a photo if anyone wants one...I don't have one handy at the moment. Bought for $50 plus $10 for the power supply. Looking for $25 shipped CONUSA, $30 with the P/S. Please no low ball offers, I've lost enough on this and I am tempted to keep it since it's been my favorite sounding reverb that I've purchased and I've done this work-around for over a year.