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Update: I've had three of these radios in the past three years. One of the radios stopped transmitting correctly as the final amplification state went out. This was due to an intermittent short in the antenna feed-line that was not apparent. As stated before, protection of the finals is inadequate. The second unit worked for a couple years then began to drift off frequency. This is likely a fault in the oscillator crystal. The third unit is functional but seldom used. Repair of the first unit is reasonable if you do the work yourself as the radio uses a common Mitsubishi mosfet which can be purchased at a reasonable cost (under $100). The unit with the frequency drift problem will not be repaired as the work would exceed the value of the radio. You should consider these a somewhat expensive disposable radio as you will likely not be able to find a service shop willing to work on these or most other Chinese transceivers.