Friday, December 27, 2013

Kenwood TS820S cathode resistor repair





Some time ago after pushing the rig too far with an antenna that was out of tune i killed both original cathode resistors in the final unit of my Kenwood.As you can see in the picture they both are cracked and when squeezing them the resistance changes significantly. I had no other option than to replace them. I used two 1 watt 10 ohm resistors from my local shop.



But after what i would call a normal operation these both resistors bursted in fire. Maybe i didint check the SWR of the antenna at that point or maybe these Chinese resistors are bad quality.I will try to put the same type new ones and try to work come contacts and see if they will do that again, because putting in a bigger, higher wattage resistors would mean that the rig would lose some of its protection in the final amp section that these resistors originaly provided.