Troubleshooting power amp section on K150-8 slant face plexi. The output transistors are 2SD211M and i am wondering if these are suitable replacements.
Nate
The original output transistors were a selected version of and RCA 2N3055 transistor. The 2SD211 transistor is a similarly rated transistor that could be used as a replacement.
That being said, I would suggest that you use the commonly available 2N3055 or as an upgrade the MJ15024.
stevem Messages: 4743 Registered: June 2004 Location: NY
Senior Member
The factory transistors where hand selected to be matched pairs so the crossover distortion would be minimal and power supply hum canceling would take place also, they may have tested for the rise time factor also which effects distortion .
Replacement transistors can be had in matched pairs for a added cost.
Your amp has been worked on it would seem, did you get it in a blowing the fuse state , or did this just start?
i got the amp for free. it worked for about five minutes. someone had been working on the amp before i got it. where would i get a matches pair of output transistors?