|I bought my Collins 30L-1 from an English gentleman back in 2008. After years of sometimes erratic operation, in 2011 I saw an add and I bought the HV rectification and filtering board of K6HM. Albeit that, I put my amp to the shelf and never bothered to make the upgrade. Few days ago I took the plunge and I change the old filtering boards with the new one. Everything worked smoothly as it's supposed to work. A few dozens of volts higher HV, better filtering and less heat into the cabinet. Less ripple as well! When I had ordered the K6HM board, mr. Young a fine example of radio amateur, had sent me for free a Teflon covered wire resistor to lower a bit the Heaters Voltage and a diode plus an electrolytic capacitor for the Bias Voltage rectification circuit. I have already order the soft key relay board from him and I am looking forward to it.|
The best 113 bucks in total, I ever spent. Thank you very much mr. Young!!!
p.s. follow the upgrade with lots of photos at sv3auw.blogspot.gr