Transistors equivalent for amplituner
Hello everybody! I have to remake the audio board for an industrial amplituner. The aplifier module.
The problem is that I don't find the BC239C the low noise transistors for the preamplifier and tone controle.
Here is the diagram. Can be substitued with 2SC1815GR with a hFE of 290 or with a 2SC945P with a hFE of 394? If I put one of those instead of BC239C the audio correction for Tape, Radio and Magnetic Phono will modify?
Also the BC307A from the differential input stage of the power amplifier with a hFE of 120 I cannot find..Can I replace it with 2SA733P or 2SA1015GR?