What is the power rating of the Peavey 300SC output BJT???

Leolabs · 8th January 2007, 12:54 AM

Part numbers are 700x4140(x=7 or 8 for both polarities) which I think is 140V 4A.But dont know about the power rating for these TO-3s.

d3imlay · 8th January 2007, 02:24 AM

The CS 400 & 800 used Mj15024 &15025. I recently tried contacting Peavey for some info. They'll be happy to take your phone order during their 9-5 bankers hours. Forget anything else.

unclejed613 · 8th January 2007, 06:06 AM

back when i had a pile of them, i used MJ15022 and 23 transistors for "general replacement" output devices on guitar and PA amps. the 15024 and 25 have better max ratings than the 22's and 23's, so if i had my 'druthers, i would use them, but don't use one to just replace one transistor of the output set, replace the whole set. you will need to readjust the bias, but otherwise, they should work fine, maybe even better than the originals.

Netlist · 8th January 2007, 06:46 AM

7 is PNP, 8 is NPN.
Here's the whole cross reference. Don't substitute without this list.
http://manuals.schematheek.com/sheet...%20replace.pdf

/Hugo

d3imlay · 8th January 2007, 02:05 PM

Quote:

Originally posted by Netlist
7 is PNP, 8 is NPN.
Here's the whole cross reference. Don't substitute without this list.
http://manuals.schematheek.com/sheet...%20replace.pdf

/Hugo

Netlist, what a cool xref.

Many thanks

pinkmouse · 8th January 2007, 02:14 PM

Those Peavey's are nice robust amps. Well worth fixing.

8th January 2007, 12:54 AM	#1
Leolabs diyAudio Member Join Date: Dec 2004 Location: Bukit Mertajam	What is the power rating of the Peavey 300SC output BJT??? Part numbers are 700x4140(x=7 or 8 for both polarities) which I think is 140V 4A.But dont know about the power rating for these TO-3s.

8th January 2007, 06:06 AM	#3
unclejed613 diyAudio Member Join Date: Dec 2006	back when i had a pile of them, i used MJ15022 and 23 transistors for "general replacement" output devices on guitar and PA amps. the 15024 and 25 have better max ratings than the 22's and 23's, so if i had my 'druthers, i would use them, but don't use one to just replace one transistor of the output set, replace the whole set. you will need to readjust the bias, but otherwise, they should work fine, maybe even better than the originals. __________________ Vintage Audio and Pro-Audio repair ampz(removethis)@sohonet.net spammer trap: http://www1284177414881.v-dc.net/

8th January 2007, 02:14 PM	#6
pinkmouse diyAudio Moderator Join Date: Apr 2002 Location: Chatham, England	Those Peavey's are nice robust amps. Well worth fixing. __________________ Al I conceive of nothing, in religion, science or philosophy, that is more than the proper thing to wear, for a while. Charles Fort

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8th January 2007, 02:24 AM	#2
d3imlay diyAudio Member Join Date: Sep 2004 Location: Ohio	The CS 400 & 800 used Mj15024 &15025. I recently tried contacting Peavey for some info. They'll be happy to take your phone order during their 9-5 bankers hours. Forget anything else.

8th January 2007, 06:46 AM	#4
Netlist diyAudio Moderator Join Date: Jan 2003	7 is PNP, 8 is NPN. Here's the whole cross reference. Don't substitute without this list. http://manuals.schematheek.com/sheet...%20replace.pdf /Hugo

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