Hi Avionic, I just bought two M-4's on ebay and the first one works great. It,s filthy inside, but I set the dc balance, rails and bias to factory spec. What upgrades, maintenance would you do for the long term besides cleaning and new silicon grease for the fets? Also, my bulbs are out. Your leds look great and I would like to do the same. Would you share your parts info and layout for the upgrade, please?
Thank you in advance, David.