SB-878 TS-530S IF Unit Q2, Q7 Protection 8-25-83 High voltage transients at the receiver antenna can be felt in the ALC circuitry and cause a failure of IF unit transistors Q2 and Q7. Symptoms encountered bay be a loss of RX sensitivity, and or loss of S-Meter deflection. Add the surge suppressor to the AF unit (X49-1150-XX) between terminal FG and ground, to prevent a reoccurance of this symptom. Parts required: Surge Suppressor ERZD03DK331 Time required for this modification is 1/2 hour or less. CLM (c) 121589TKC