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Old 19th November 2007, 07:44 PM   #1
glen65 is offline glen65  United States
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Join Date: Jun 2004
Location: Richland County Ohio
Default Transistor replacements

Hello
I am currently doing a rebuild on an old amp.
Many of the transistors that were used are no
longer available.
I already have MJ21195/ 21196 for the outputs
and MJE15030/15031 for the drivers.
I already had some possible replacements in mind for the
others but I wanted to get some recommendations
from you guys first before ordering anything.
The B+ voltage in this unit is about 60 volts.
Below is a schematic of the amp and a transistor list
with the original numbers. There are also links so you
can see the specs of the original transistors.


Thanks.
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Old 19th November 2007, 07:48 PM   #2
glen65 is offline glen65  United States
diyAudio Member
 
Join Date: Jun 2004
Location: Richland County Ohio
Here is a parts list and links to get the datasheet
for the original transistors.

Data sheets for originals.
2n4889
http://www.datasheetarchive.com/specsheet/2N4889.html
BF257
http://www.datasheetarchive.com/preview/851284.html
BC308B
http://www.datasheetarchive.com/preview/826504.html
SE6020
http://www.datasheetarchive.com/preview/3046941.html
MPSA20
http://www.datasheetarchive.com/preview/2452852.html
BC237
http://www.datasheetarchive.com/preview/825546.html

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