Just to add a little more detail to my request, I am not an experienced DIY'er. I have made interconnects and refoamed speakers but that is about it. I am pretty comfortable with my ability to solder and follow instructions and take my time on projects, but I have never built or rehabbed an amp or preamp. So along with the quality of sound, I need something relatively simple to install.....I would prefer a completed board as opposed to a blank board with all the parts and instructions. I think I need to replace the main driver board and the quad cap. Thanks again for your input.
ST-70 modifications
I tried a search, but had surprisingly little luck in finding info. I have a stock Dynaco ST-70. I am looking for opinions on what mods are recommended. I am thinking Curicio, Welborn/Kimmel, Van Alstine, Triode Electronics....etc. Looking to replace the driver board and the quad capacitor at a minimum. Thanks for your input