SAE 2400 amp needs help

scm · 28th June 2007, 04:42 PM

First, greetings to all...
I have an SAE 2400 that needs some work done to it.

I`ve had it since '84 and it has sat in a closet about 10 years now due to
some speaker wires that got shorted out and took out one of the channels. I think the output transistors might need replaced.

Should I just sell it on ebay as is ? or is it worth fixing ? Gotta admit I really like the beefy looks and the big analog meters..kinda miss staring at them while listening too.

If I decide to fix it, I don`t want a shop that will hold my parts for ransom with some huge repair bill.
I don`t mind paying for good parts and good work but i don`t like getting hosed either.

I wouldn`t mind a DIY attempt either but I`ve never built anything electronic before.

Any suggestions/opinions would be welcome.
Thanks
Steve

Jan Dupont · 28th June 2007, 07:13 PM

Maybe this schematic can help you
http://www.audio-circuit.dk/Schematics/SAE_2400.pdf

scm · 28th June 2007, 07:51 PM

Thanks Jan, I printed that out, could come in handy sometime.
Steve

scm · 1st July 2007, 03:12 AM

Anybody know what output transistors are needed to replace the factory ones?

djk · 1st July 2007, 03:57 AM

The designer recommends MJ21193/94.

Original Burnedfingers · 1st July 2007, 11:23 AM

The correct way to rebuild this amplifier or any amplifier of that age is to replace all semiconductors and capacitors. In addition the main filter caps should be replaced. There are also a number of resistors that should be replaced because of their age and composition. Your looking at a amplifier that was manufactured around 1975 so its high time for it to get a face lift.

scm · 1st July 2007, 05:59 PM

burnedfingers...is what you suggest suitable for a novice ?

Where would I source out those parts?
Are there brands that would also be an improvement over the factory issue pieces ?

Original Burnedfingers · 2nd July 2007, 10:45 AM

Quote:

burnedfingers...is what you suggest suitable for a novice ?

In my opinion...no.

I have seen too many basket cases from novices.

One example ....I repaired an amplifier that someone of very limited skill had worked on and managed to totally wreck a number of traces.

The traces aren't that thick and require the usage of proper desoldering equipment to minimize damage to the board.

There is a very good chance that the amplifier has been repaired one or more times in the past and this all takes a toll on things.

After all...you wouldn't take your car to a plumber would you?

scm · 2nd July 2007, 10:08 PM

Thanks guys...I`ve decided just to put it on Ebay as is.

28th June 2007, 04:42 PM	#1
scm diyAudio Member Join Date: Jun 2007	SAE 2400 amp needs help First, greetings to all... I have an SAE 2400 that needs some work done to it. I`ve had it since '84 and it has sat in a closet about 10 years now due to some speaker wires that got shorted out and took out one of the channels. I think the output transistors might need replaced. Should I just sell it on ebay as is ? or is it worth fixing ? Gotta admit I really like the beefy looks and the big analog meters..kinda miss staring at them while listening too. If I decide to fix it, I don`t want a shop that will hold my parts for ransom with some huge repair bill. I don`t mind paying for good parts and good work but i don`t like getting hosed either. I wouldn`t mind a DIY attempt either but I`ve never built anything electronic before. Any suggestions/opinions would be welcome. Thanks Steve

28th June 2007, 07:13 PM	#2
Jan Dupont diyAudio Member Join Date: Apr 2003 Location: Copenhagen, Denmark	Maybe this schematic can help you http://www.audio-circuit.dk/Schematics/SAE_2400.pdf __________________ Free Schematic and Service Manual downloads www.audio-circuit.dk, Company: www.dupont-audio.com, Joint venture: www.DupontMantra.com

1st July 2007, 03:57 AM	#5
djk diyAudio Member Join Date: Feb 2001 Location: USA	The designer recommends MJ21193/94. __________________ Candidates for the Darwin Award should not read this author.

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28th June 2007, 07:51 PM	#3
scm diyAudio Member Join Date: Jun 2007	Thanks Jan, I printed that out, could come in handy sometime. Steve

1st July 2007, 03:12 AM	#4
scm diyAudio Member Join Date: Jun 2007	Anybody know what output transistors are needed to replace the factory ones?

1st July 2007, 11:23 AM	#6
Original Burnedfingers diyAudio Member Join Date: Nov 2002	The correct way to rebuild this amplifier or any amplifier of that age is to replace all semiconductors and capacitors. In addition the main filter caps should be replaced. There are also a number of resistors that should be replaced because of their age and composition. Your looking at a amplifier that was manufactured around 1975 so its high time for it to get a face lift.

1st July 2007, 05:59 PM	#7
scm diyAudio Member Join Date: Jun 2007	burnedfingers...is what you suggest suitable for a novice ? Where would I source out those parts? Are there brands that would also be an improvement over the factory issue pieces ?

2nd July 2007, 10:08 PM	#9
scm diyAudio Member Join Date: Jun 2007	Thanks guys...I`ve decided just to put it on Ebay as is.

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