Anyone have a schematic for the old Borbely 60W MOSFET Amp

jwv3 · 25th April 2009, 12:00 AM

I have an old amplifier that was given to me. It is a 60 watt Borbely amp built on pc boards from Old Colony. I would like to get it back to good operational condition. The only problem with it is a 90mV dc offset on one channel's output.

If anyone has a schematic for this they could share I would greatly appreciate it.

jackinnj · 25th April 2009, 01:13 AM

It's most likely on Erno's website. Both of the amplifiers he described in his series of AA articles are fantastic.

http://www.borbelyaudio.com/special_articles.asp

fab · 25th April 2009, 03:19 AM

Quote:

Originally posted by jwv3
...The only problem with it is a 90mV dc offset on one channel's output.

Is it really a problem?

WALTER BURKHARD · 25th April 2009, 03:59 AM

jwv3 send a picture on diyaudio.

I have mostly all from Erno Boberly Amp drawings.

br Walter

smithy666 · 26th April 2009, 09:45 AM

or contact Erno directly to help you out. He is a really nice guy and his designs are among the best you can get.

jwv3 · 26th April 2009, 02:21 PM

Well, turns out I have it after all. I forgot I had the book Audio Amateur Power Amp Projects. It has the entire original article on the amp which is even better.

Can I edit the thread subject? Or perhaps I'll start a new thread entitled Restoring a Borbely 60W Mosfet Amp

Quote:

Originally posted by fab

Is it really a problem?

After looking into it more, the channel is not working properly. I get a very low output and a small buzz. I'll start with replacing the electrolytic caps and checking the Mosfets.

25th April 2009, 12:00 AM	#1
jwv3 diyAudio Member Join Date: Mar 2002 Location: DE	Anyone have a schematic for the old Borbely 60W MOSFET Amp I have an old amplifier that was given to me. It is a 60 watt Borbely amp built on pc boards from Old Colony. I would like to get it back to good operational condition. The only problem with it is a 90mV dc offset on one channel's output. If anyone has a schematic for this they could share I would greatly appreciate it.

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25th April 2009, 01:13 AM	#2
jackinnj diyAudio Member Join Date: Apr 2002 Location: Llanddewi Brefi, NJ	It's most likely on Erno's website. Both of the amplifiers he described in his series of AA articles are fantastic. http://www.borbelyaudio.com/special_articles.asp

25th April 2009, 03:59 AM	#4
WALTER BURKHARD diyAudio Member Join Date: Dec 2002 Location: Helsinki	jwv3 send a picture on diyaudio. I have mostly all from Erno Boberly Amp drawings. br Walter

26th April 2009, 09:45 AM	#5
smithy666 diyAudio Member Join Date: Mar 2001 Location: Sydney	or contact Erno directly to help you out. He is a really nice guy and his designs are among the best you can get.

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