Repairing an old Mac Amp - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Solid State Talk all about solid state amplification.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Closed Thread
Thread Tools Search this Thread
Old 29th November 2001, 07:05 AM   #1
diyAudio Member
Join Date: Nov 2001
Location: Malaysia
I am trying to salvage an old Mcintosh MC2100 Amp that has been hit by a power search. Can anyone ppls let mw know the commercial numbers of the Mc parts Nos. 132-038 and 132-039? If these are discontinued, any new replacements?
Old 3rd December 2001, 05:59 PM   #2
The one and only
Nelson Pass's Avatar
Join Date: Mar 2001
If you are referring to the output devices, I
previously have had some luck using the Motorola
MJ15022 and 24 for the NPN and the 23 and 25 for
the PNP.
Old 4th December 2001, 09:01 AM   #3
djk is offline djk
diyAudio Member
djk's Avatar
Join Date: Feb 2001
Location: USA
The outputs in a MC2100 are all NPN and are closest to an
MJ15003.All the smaller transistors are available from McIntosh at reasonable prices.Before you do anything though, make sure the power transformer is OK.The 6.3V winding that drives the pilot light is not fused.If the light shorts out when it goes (a common occurance) the 6.3V winding will overheat and short out the entire transformer. The transformer is no longer available from McIntosh.
Old 5th December 2001, 06:56 AM   #4
diyAudio Member
Join Date: Nov 2001
Location: Malaysia
Thanks guys for the tip. I've earlier changed the o/p device of one channel to MJ15003s and it works fine but the devices that I mention are N and P channel transistors driving the output devices of the other channel. The originals are TO5 packings that comes together with a heatsink and I believe the devices could be RCA 40409 and 40410. These devices come attached with exactly the same heatsink as those in the Mac. The voltage specs seem to be quite suitable. I've checked with Macintosh and was informed the original parts were discontinued and offered a modification kit which is somewhat expensive. Anybody know of any commercial equivalents that I can install without having to modify the curcuit? Could do with some help here.
Old 5th December 2001, 09:37 AM   #5
djk is offline djk
diyAudio Member
djk's Avatar
Join Date: Feb 2001
Location: USA
RCA 40409 .7(Ic)/90(V) TO-39
Driver Transistor w/heat sink
RCA 40410 .7(Ic)/90(V) TO-39
Send us an email to and include your zip code in your subject line. We will promptly reply with the dealers in your area.

Expensive but still available.An alternative is to use the 2SA1306/2SC3298 pair with TO-220 heatsinks.Watch the pin-out if you do this.About 1/10th the price.

[Edited by djk on 12-05-2001 at 04:57 AM]

Closed Thread

Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Repairing an amp Spax Everything Else 16 5th May 2009 11:48 PM
Repairing MIT ICs question jev Everything Else 3 26th June 2008 07:23 AM
Help repairing a CS-400 glaforce Solid State 2 17th February 2008 08:55 PM
repairing a/d/s/ 640 amp Ocelaris Car Audio 2 16th February 2006 02:35 AM
Repairing VTL TL2.5 effindi Tubes / Valves 4 30th November 2004 06:57 AM

New To Site? Need Help?

All times are GMT. The time now is 02:02 PM.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright 1999-2017 diyAudio

Content Relevant URLs by vBSEO 3.3.2