rhthatcher

My plan is to ring out the transformer on my Quasimodo tester and oscilloscope, then use a bigger bridge with one of my snubber PCBs on it. See boards I've made. The bridge/board will be chassis mounted. I'll run wires from the transformer on the AC side. Maybe from solder points on the board, maybe directly I'll snip transformer wires and put quick disconnects on. I'll make the call as I do it. DC side will be flying wires soldered to appropriate spots on the board. I'll cut those fried traces, too.

Looking at the bottom of the preamps I keep wondering if the thick black wires a heavy duty star grounding method?

Here's the Blueberry PCB bottom pic below the bridge. It definitely got hot.

Great to know - thank you for the tip BillyBob!! Couple more to go....

Mark - I'm a new member on here, so the system says I can't send PM's. When you're back from your vacation can you try to send me one and we can connect via email? Enjoy your vacation!! Randy

Mark, Someone on another forum pointed me to this thread. I just received a Juicy Music Blueberry Xtreme with Cream preamp recently. I originally owned it from 2007-2018, sold it, and just bought it back. It was "one that got away". I reached out the the buyer a year or so after selling it, and thankfully he thought of me before listing it again. I opened it up to put tubes in and see that 2 traces to the rectifier bridge are lifting. The PCB looks like it took a lot of heat in the area of that bridge. The caps around the bridge also look to be cracked / drying out. Before I power it up I want to fix that up. While I'm in there I'd like to implement a few mods you used to do: power supply mod, maxim mods, and 6H30 retrofit. Is it possible to get a technical package / schematics? My initial plan is to simply put a bigger bridge rectifier with a snubber circuit on the chassis and run wires where they need to go. That's an easy fix for the obvious issue, and it solves my short term need. I'll need more info to jump into the other mods. Best, Randy