Shaun_Musings Messages: 323 Registered: April 2009 Location: Reading, MA
Senior Member
Starting a new thread to avoid irritating people
The problem with the Internet is anyone can write anything; when searching for a replacement for the three transistors on PC602, someone said NTE123. Now if I am searching, I immediately write 'NTE' instead of 'Substitute.' I am rarely brand loyal, but too much misinformation.
All three transistors on PC602 are NTE129. Two are new; the one on the bottom was an older one I reused from a different misplacement. I should have replaced that one, too, but somehow I didn't. Retested (rounded the numbers).
+10
-25
Before I had +9, so not sure where the extra volt came from. On PC502, the red wire connection is dubious, at best (It had a lifted pad, and when I went to put it back down it broke off.) I have new copper traces (tape) and so I'll replace that. At the very least the traces will be cleaner.
I will also double-check the resistors, as one of them did burn up a while ago, and who knows if some of them might have drifted or so over the years.