Guru
Joined: 12/08/2011
Location: AustraliaPosts: 357
| Posted: 05:45am 15 Jan 2023 |
Hi All
First attempt at attaching a .pdf
Having difficulty finding a replacement transistor which are listed in the spares list as "Transistor,Silicon,NPN (Motorola SPS6979; Spraque TZ8630; G.E.X32B 4682"
The part does not come up in the Motorola cross reference list.
On the circuit they are Q5 & Q6 which also have the number S 300B with them.
Would anyone hazard to guess an alternative looking at the circuit.
The Voltage rails are +30 and -30vdc .
The center rail (base of Q7 pair) is suppose to be driven to about 0v with no input on terminal 3 on left of drawing.
Would love someone to tell how and what Q5 & Q6 are suppose to do.
Regards
Screenshot.pdf
Edited 2023-01-15 15:45 by Dinosaur