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output transistor replacement [message #24196] Mon, 30 November 2015 10:39 Go to next message
natedriver is currently offline  natedriver
Messages: 35
Registered: March 2009
Member
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

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Re: output transistor replacement [message #24197 is a reply to message #24196] Mon, 30 November 2015 14:09 Go to previous messageGo to next message
chicagobill
Messages: 2006
Registered: April 2003
Senior Member
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.

Have you tested the transistors?

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Re: output transistor replacement [message #24198 is a reply to message #24196] Mon, 30 November 2015 18:27 Go to previous messageGo to next message
natedriver is currently offline  natedriver
Messages: 35
Registered: March 2009
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Yes. they tested fine.
thanks for the info!
Nate

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Re: output transistor replacement [message #24199 is a reply to message #24196] Tue, 01 December 2015 06:08 Go to previous messageGo to next message
stevem is currently offline  stevem
Messages: 4773
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?

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Re: output transistor replacement [message #24200 is a reply to message #24196] Tue, 01 December 2015 13:26 Go to previous messageGo to next message
natedriver is currently offline  natedriver
Messages: 35
Registered: March 2009
Member
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?

Nate

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Re: output transistor replacement [message #24201 is a reply to message #24196] Wed, 02 December 2015 06:24 Go to previous message
stevem is currently offline  stevem
Messages: 4773
Registered: June 2004
Location: NY
Senior Member
If both outputs are good do not fret about that for now , get the amp back up and running and then slapping in two matched outputs is a 10 minute job.

[Updated on: Wed, 02 December 2015 06:25]

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