First of all, I appreciate your valuable help, I could already get the equivalent for NPN output transistors, and are not expensive in Mexico,
I doubt more to change the RCA 38737, according searching but found the NTE129 NPN and mentions that the electronic diagram is PNP.
I can help in recommending me an equivalent for transistor Q705 (RCA 38737). ????.
My amp is Kustom B200-B1. and is what I find best for bass Guitar.
Greetings from Mexico. you are the best of the world to help people in trouble ..