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Old 24th February 2005, 04:08 AM   #1
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Smile motorola transistor part number

Hi all,
I am fixing an audio research D-100B power amp. I think the output power transistors are dead. I don't know the part number printed on the transistor cover. What printed on the cover are motorola 300027 7926 and motorola 300026 7852. Apparently, they are complementary pair. I think the number is only for audio research interior reference.
Anybody knows what they are??
Thanks alot!
Lhchen
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Old 24th February 2005, 04:24 PM   #2
jaycee is offline jaycee  United Kingdom
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If they are motorola in TO-3 cans you can bet they are MJ15003/04 or MJ15024/25. In any case either of these should drop right in and work identically.
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Old 24th February 2005, 10:15 PM   #3
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Hi,

Thanks for the help. They use 6 pairs of pnp and npn power transistors in parallel to produce only 100 watts output at +55v -0- -55v voltage. So, it's very unlikely to be one of those that we often use. Those transistors must be out of production nowadays and long not availible.
I am looking for substitutions, still motorola ? no sanken?
Thanks for any coment.
Lhchen
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Old 24th February 2005, 11:05 PM   #4
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I am looking for substitutions, still motorola ? no sanken?

Yes, still Motorola/on semiconductor. No not Sanken if you want it to live for a while.

As mentioned by jaycee either of the motorola parts will work.
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Old 24th February 2005, 11:38 PM   #5
Eva is offline Eva  Spain
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Sanken and Toshiba no longer produce meatal can T0-3 bipolar output devices. Motorola is almost the only source

These three companies produce very reliable transistors, but Sanken and Toshiba suffer more from fakes in the American and European markets
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Old 25th February 2005, 02:43 AM   #6
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Wait a minute!!
After I opened up the chassis, I found out 6 pairs of NTE60/61 each channel. We know NTE60/61 are equivalent to MJ15003/15004. My Audio Research D100b got only output at 100 watts at 8 ohm. At B+ as 55v-0v+55v, what would be the output rating? Where are those transistors from? Somebody put them in? For extra power?
Am I missing something here? Oh My! I bought a lemon.
Lhchen
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Old 25th February 2005, 02:46 AM   #7
djk is offline djk
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"Thanks for the help. They use 6 pairs of pnp and npn power transistors in parallel to produce only 100 watts output at +55v -0- -55v voltage. So, it's very unlikely to be one of those that we often use. Those transistors must be out of production nowadays and long not availible.
I am looking for substitutions, still motorola ? no sanken?
Thanks for any coment."

Why not use what Audio Research used?

The date codes indicate the 78~79 vintage, the MJ15022/23 was just showing up in amplifiers, that's probably what they are.

Take a dead one and cut the top off and look!

If not an MJ15022/23 they are most likely MJ15003/04.
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