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Each relevant transistor is Hfe graded on the schematic. G,D,P etc. See the datasheet links in 2 for the details applying to each type. Note that you can no longer buy these many varieties - legacy or generic products are only available in 1 or 2 grades or unmarked.
Sorting is the only practical option unless it is a non-critical application. There are dozens of small value electrolytics in there, isolating DC from the signal at every stage in the preamplifiers and control circuits.
Replacing these with good quality caps will be a worthwhile exercise whether transistors are shot or not. Thanks for this reply, Ian. Is there any reason to suspect the configuration E. I got a little worried there may have been a change - [I]after[I] I removed the twenty transistors.
All OK in Replay Mode. Each transistor I then mounted on a small annotated card and splayed their legs to keep them in position. They were already changed when I bought the machine NEW in There were other transistors not complying with the List on P. If you have this list everything will fall into place as I now make a list of the removed transistors along with their Name, position in Cct, and Hfe: Transistor TRNo.
In view of the comment about the caps in the PCB should I push the boat out a bit more and get one?? Michael UK.
2SC458 Bipolar Transistor
C945 Transistor Pinout, Equivalent, Uses, Features & Applications