I have a 30 year old Realistic TRC-428 Ninescan CB Radio I bought new in 82'. It's been in storage for 25 years. I recently pulled it out of storage and it will only deadkey 2-2 1/2 watts am carrier but has a good modulation swing to it. I heard that caps go bad. I had someone turn it up 28 years ago. The things would swing backwards on it's meter. Also the modulation limiter resistors(R104&R90) are still in place but it will only modulate 70% even with a RF Limited Turbo Xtreme 2018 power mic hooked up. I have two questions. Is this radio worth saving and being fixed and does anyone know where to find a schematic for this radio? I 've searched and searched but it seems that this may have not been a popular radio. Thanks.
op:Would anybody know why this radio has a low dead key. Also when in a mobile application,when I turn the engine off,the dead key drops to 1 1/2 watts,the meter light greatly dims and the receive gets a whole lot quieter. I've heard about the old glue on the pcb topic and the electrolytics. Why would the caps need replacing? Questions,questions,questions. Thanks for any wisdom bestowed!