I was asked to check Ahuja Amplifier SSA-100M which belongs to a church in which MIC inputs 2 and 3 not working.
The Church Priest said this happened after lightning strike while it was working.
Symptom: two microphone inputs not working & very low pre amplifier gain.
I checked the amplifier with all MIC inputs & with all AUX inputs found two MIC inputs (MIC2&3) out of order & the overall gain of the amplifier is very low.
First I checked the mixer section, then proceeded to pre amp section & found fifteen 2SC1815 transistors, physically no damage, but internally damaged by lightning strike.
So I replaced all fifteen 2SC1815 transistors, which brought back amplifier to life.
