02-20-2017, 09:34 PM
EDIT: This is a continuation of a thread which was accidentally deleted by me. 
In case you are wondering...the Marantz 4230 is fixed. No more distortion.
The culprits? Transistors H706 and H707. Base and collector were transposed on both.
Why?
The datasheet for those transistors gave incorrect pinouts for that transistor type.
From now on, before installing new transistors, I will check them with the diode test on my multimeter to make sure what the datasheet says is the base really is the base. I will then test the new transistor on my transistor tester to make sure that the emitter and collector leads are also what the datasheet specifies.
Many thanks to Phorum member Ed L. for his help in getting this problem solved.
In case you are wondering...the Marantz 4230 is fixed. No more distortion.
The culprits? Transistors H706 and H707. Base and collector were transposed on both.
Why?
The datasheet for those transistors gave incorrect pinouts for that transistor type.
From now on, before installing new transistors, I will check them with the diode test on my multimeter to make sure what the datasheet says is the base really is the base. I will then test the new transistor on my transistor tester to make sure that the emitter and collector leads are also what the datasheet specifies.
Many thanks to Phorum member Ed L. for his help in getting this problem solved.
--
Ron Ramirez
Ferdinand IN
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