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Old 24th January 2008, 09:10 PM   #1
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Default McIntosh output transistors

Hi all,

I need help for the replacement of transistors in the output stage of McIntosh amplifier MC2105.

The original part numbers are:

132-517
132-518
132-541
132-542

Anyone can help me?
Thank you in advance.

Paolo
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Old 28th January 2008, 01:00 AM   #2
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Mac doesn't like people to work on their products.

Just for fun I looked in the NTE crossref.

The last two numbers numbers cross to an NTE130 which appear to be 2N3055. Their complement is MJ2955.

NTE lists 132-515 and 516 but not your 517 and 518.

The 541 is an NTE130 and the 542 is an NTE130MP=matched pair.

Doesn't make a whole lot of sense, but..............................there you go. Mark
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Old 29th January 2008, 09:35 PM   #3
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Hi Mark,

I have appreciated your suggestion.

I will start with the equivalent types indicated by NTE trying to find commercial transistors with characteristics very close to those indicated.

Thank you very much.

Paolo
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Old 1st February 2008, 04:27 PM   #4
wg_ski is offline wg_ski  United States
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Quote:
Originally posted by paolofuma

I will start with the equivalent types indicated by NTE trying to find commercial transistors with characteristics very close to those indicated.

Look at the rest of the threads around here - NTE=bad news. You could try MJ15015 & 15016, which are 180 watt 120 volt versions of the 2N3055 and MJ2955. Speed-wise they seem to be about the same. The die are a little bigger but look the same.
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Old 2nd February 2008, 05:27 PM   #5
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The warning about NTE is sound advice. Although a rare occurrence in NTE crossovers, the NTE130 is probably actually a 2N3055 because the 3055 is so very common. I should have warned about using a cross-reference. The MJ15015 is shown in the Motorola data book to be an upgrade for the 3055 and the current gain at high output is identical. Same for the PNP.
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Old 5th February 2008, 08:20 PM   #6
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OK,

Thank You for the advice.

Paolo
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Old 9th March 2010, 11:17 PM   #7
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hi guys, anyone know which transistor 132-054 is?

thanks.
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