Several years ago I Modified a GE Mastr II mobile to be a 220 (35 watts) repeater and places an Advanced Receiver Research peramp with a resistor, capacitor and diode added for lighten protection.
http://homepage.mac.com/pseabolt/mods/220.htm In a few years I modified another GE Master II for an 800 MHz repeater case and used the same pre-amp. (60 watts) A few months ago I did another modification and added and external 220 amp. the amp is 28 volts and does over 200 watts but I am running about 100 watts. I placed a new AR2 preamp on the repeater and after a week the sensitivity went from .05 mv to open the squelch to .7 mv. The GasFET in the preamp was gone. I replaced the preamp with the orginal preamp than had been working for about 10 and a couple of weeks later, it gone too. Can you guys think of anything that would cause two amps to go in this short of time? Is this just coincidence or could the extra power have something to do with the failures.
