Our most common amplifier is OCL circuit, OCL circuit method can be completely non-destructive power amplifier tube, for your reference.283service manual download site
283service manual download site
OCL amplifier no output capacitor, double Dianyuan power supply plus or minus symmetric, normal ≈ 0V when output (the actual deviation minimum).283service manual download site
283service manual download site
Damaged power tube removal and good power amplifier tube, small and medium power transistor, resistor burnt also removed. Power, measured positive and negative Dianyuan supply is basically symmetrical, or power supply repaired Dianyuan (easy).283service manual download site
283service manual download site
Replaced all damaged of components (high-power tube temporarily not installation), power Hou Board Shang all resistance, and small power transistor has fever of or output end voltage not is equal to 0V, description circuit in the also has components damaged, can through measuring each points voltage judge damaged components, also can power measuring resistance, transistor to split down measuring, resistance can in road with digital multimeter measuring, replaced damaged components, until last reached this standard: output end voltage basic =0V.283service manual download site
283service manual download site
Input signals are available to play a sound, because there is no big power tube, sounds smaller, just like regular radios do, try again 10-20 minutes, sound is always distorted, components, no abnormal heat, close the retest ≈ 0V output voltage of the input signal without drift, to install the power transistor, a success.283service manual download site
283service manual download site
If just one channel and another channel can be used for reference.283service manual download site
283service manual download site
Not sure if you fix when I try quality, in series high capacity high voltage output capacitor at the output, confirming that the repair was successful again.283service manual download site
283service manual download site
Above methods may seem trouble, but trouble is easier, if plan sponsors direct all installed power transistor, in all likelihood there will be burned again.283service manual download site
283service manual download site
In addition, generally hand there is some power of Split airport in, for example, A940, C2073 (teardown of many dime can do something, even if burned do not fear), connected like a power transistor, but in the e series a larger zuzhi resistance of resistors, rest assured it a try, except for small output current, the other completely the same as using a high power tube.

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