I bought this head under the premise it "didn't work". But when I asked the novice who owned it what symptoms it gave, I knew right out the gate it was a simple tube replacement. Lo and behold, EXACTLY that! So I'm the owner of this EXTREMELY hard to find KUSTOM head. As in.. I CHALLENGE ANYONE.. TO SCOUR THE NET..AND FIND ANOTHER.. it's LITERALLY... impossible.. for me anyway.. well, at any rate... I'm an extended range metal player.. and KUSTOM DOES have some unsung heroes in that realm.. but this is NOT one of them.. although it does take pedals BEAUTIFULLY!.so yeah..now I'm letting it go, at a negotiable rate.. but was looking for $300 on it.. which is good for ANY full sized tube head..moreover a rare one. But hey.. we can find a happy medium I'm sure.