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Old 10th October 2011, 01:29 PM   #1
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Default Audio Transistors New/Used

Hello, we have the following audio transistors, pair matched, both brand new and used. The used are fully tested before shipping. Not all parts has both new and used, some has only new and some has only used.

mj21193 MJ21194
MJ21195 MJ21196,
mj15024 MJ15025
MJ11032 MJ11033
2N3055 2N2955
MJ15003 MJ15004
TIP147 TIP142
FJL4315 FJL4215
2SA1145 2SC2705
2SC5200 2SC1943
2SC2921 2SA1215
2SC2922 2SA1216
2SC3280 2SA1301
2SC3264 2SA1295
2SA1145 2SC2705
BC550 BC560
2SA1186 2SC2837
B647 D667

New items will be post if there're some.

Pls pm or post in reply for inquiry.
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Last edited by siliconray; 10th October 2011 at 01:36 PM.
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Old 11th October 2011, 01:29 AM   #2
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New:

B649 D669
2SA970 2SC2240
BD139 BD140
BC327 BC337
2SA1306 2SC3298
2SC2921 2SA1215
2SC2922 2SA1216
2SC3280 2SA1301
2SC3264 2SA1295
MJL4281 MJL4302
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Old 11th October 2011, 11:14 PM   #3
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FETs

IRFP240, IRFP9240
IRFB4020
IRFI4019H
2SK134 2SJ49
2SK1058 2SJ162
2SK214 2SJ77
2SK1529 2SJ200
2SK170 2SJ74
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Old 12th October 2011, 02:16 AM   #4
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IRF6645
MJL4281A/MJL4302A
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Old 17th October 2011, 05:16 AM   #5
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Planning to provide matched quad, what's your thought?
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Old 17th October 2011, 03:19 PM   #6
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All transistors are listed here:
Discrete - Audio - Amateurs - Boards | Kits | Components | Modules | Tools

If any problem please feel free to contact me
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Old 4th November 2011, 07:38 AM   #7
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Default How do we match a pair?

The matching work is used to be done by the supplier. But we had been surfered a lot by their unprofessional. We decided to do the matching by ourself.

To match a transistor accurately (say, 1% for same device and 3% for push-pull), a tracer is necessary. We got a digital tracer with storage function to do this work.

Step 1, measure a group of trace, store it
Click the image to open in full size.

Step 2: Measure another transistor, store it
Click the image to open in full size.

Step 3: compare them
Click the image to open in full size.

Matched pair (FET):
Click the image to open in full size.

Unmatched:
Click the image to open in full size.
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