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Old 25th September 2012, 10:08 AM   #1
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Default To make this amp sound better

Hello friends

can somebody give suggestions to make this amplifier sound better

Regards
Jacob
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Old 25th September 2012, 10:25 AM   #2
jaycee is offline jaycee  United Kingdom
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Replace it.
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Old 25th September 2012, 11:11 AM   #3
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It's a very basic PA amp. As post two states, if the case is any good keep that, the rest would be better pushing up daisies.
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Old 25th September 2012, 11:53 AM   #4
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Default Sorry, but this one to sound better will need

replacement or to switch it off.

regards,

Carlos
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Old 25th September 2012, 04:39 PM   #5
wg_ski is offline wg_ski  United States
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Stone knives and bear skins technology, and the drawing is dated 2000????

You could build the whole thing out of op amps, with an LM3886 for the output and pickup two orders of magnitude improvement without even trying. It looks like something out of 1970.
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Old 30th September 2012, 12:59 PM   #6
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That scem loks very much like an eagle pa amplifier .
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Old 30th September 2012, 01:20 PM   #7
Jay is offline Jay  Indonesia
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From the fuse (10A), the transformer must be big enough for class-A amp. I predict it is a 150W amp.

You have +/-24Vdc (or 48V single ended high voltage, or 24V high current), enough capacitance, not so big heatsink. The output transformer I don't know what for, but choke supply is possible. I guess 7W class-A is possible. Higher wattage (JLH) is also possible if there is room for fan (may be externally).
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Old 30th September 2012, 04:16 PM   #8
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I only see +24vdc, ground. Those 4 diodes are not in a bridge configuration, they are in parallel. He will need a bridge etc...
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Old 1st October 2012, 01:42 AM   #9
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Get a real audio amplifier. A PA amplifier with an 8R monitor winding on the output transformer (like this one) does not make it suitable for music. Believe me, there are thousands of similar PA amp designs that were fine for that purpose but compromised on bandwidth and fidelity at every other stage.

IME, trying to open up the bandwidth of these old machines is more expensive and ineffective than a simple substitution of a cheap chip-amp as suggested in #5. If you can afford it for the sake of having a discrete design, then buy a kit of a basic 50-80W amplifier like Ebay NAP140, L6 etc.
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Old 1st October 2012, 05:15 AM   #10
ChrisA is offline ChrisA  United States
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Quote:
Originally Posted by jacobsetti View Post
Hello friends

can somebody give suggestions to make this amplifier sound better

Regards
Jacob
People are saying to simply replace it. But what is the application? This looks like it is used for voice amplification in an auditorium. In that case you might do better thinking about acoustical treatments and speakers as that will improve the sound more than anything you could do to the amplifier.

The amp was never intended for use as a home HiFi. If you are trying to use it for that purpose, it would be mostly useless in that application. But the power transformers and chassis might be the start of a new project.
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