I picked up what I thought was a dead JCM 800 2204 for a great price. I was told it was dead, and had a bad OT. Never turned it on, and bought it not knowing what it would cost to fix. I wanted to get it working and since it may need a new OT, and perhaps other things, I didn't feel bad about drilling holes into what would be a non original JCM 800 for an effects loop. I would keep it and use it, and I prefer a loop for effects. I get the amp back from the local repair and he says the OT is ok and that it was a few other small things instead and got it working again. So now, I still would like an effects loop but don't wanna drill holes. I looked at the Metropoulos Zero loss loop but it looks like holes need to be made unless there are other ways. I looked up using a speaker out to an attenuator, then line out from that going into my effects, out of the effects into a power amp, out of the power amp to a cab or two...this I learned is what is called the Wet/Dry/Wet set up. So need advice... Add the loop someway without drilling? If yes, how did you do it? Go W/D/W tell me what you used as the attenuator to have best results. Attenuators range in price so don't want to get crazy. Thanks!