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22nd July 2011, 09:00 AM
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#1 |
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diyAudio Member
Join Date: Jul 2011
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AKAI AM-U1
Hi there
I purchased the above amp second hand to tie me over for a couple of months before I move countries. This is the first amp I have ever owned. The lady who sold them to me also sold me some Sony Hi Fi speakers to go with it. The model no of the speakers are SS-CCP500 and they have a rated impedence of 6ohms. The amp says 4-16 ohms. When I first started using this about 2 weeks ago there was great sound out of it. Now it sounds terrible if it is turned up, like a shakey kind of sound. It is possible that my friend may have turned up the bass and treble to the last. I take it that the speakers have been damaged. Is this amp too powerful for these speakers? Is there anything that can be done to rectify this issue. Also I am now considering purchasing a set of 50W Acoustic Solution speakers from Argos. Any help greatly appreciated! |
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23rd July 2011, 03:36 AM
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#2 |
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diyAudio Member
Join Date: Mar 2010
Location: Santiago, RS/ Brasil
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May not be an overload issue, since output power is rated 25W@1kHz per channel, 0.3% THD.
AKAI AM-U1 U2 - Electrónica - Esquemas - TV - Áudio - Digital Do a detailed inspection in the power supply capacitors´ pins. Once mine got a broken leg due to oxidation. And it sounded like yours. After replacing all the big capacitors in both supplies, it worked very well.
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We should not dwell on what we do not have, but, instead, be grateful for what we do have! 
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23rd July 2011, 11:00 AM
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#3 |
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diyAudio Member
Join Date: Jan 2006
Location: nea makri athens greece
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Replacing the big capacitors is only 10% of the job and sorry to say its a very childish approach ....
In an amplifier of this age all capacitors need to be replaced ( and all means all ) and also that is a simple given fact replacing one that is faulty means that the next one will fail in 15 days or so ... here is some info in a can vintage amplifier repair/upgrade manual
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SERVICE ΙΑΠΩΝΙΚΩΝ ΜΗΧΑΝΗΜΑΤΩΝ ΗΧΟΥ www.eastelectronics.gr |
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23rd July 2011, 12:41 PM
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#4 | |
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diyAudio Member
Join Date: Mar 2010
Location: Santiago, RS/ Brasil
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Quote:
 Yes, of course, all capacitors must be replaced! Thank you again! Erukus, read carefully that sakis' guide to restore an old, vintage amplifier. It is a complete guide to get your amp up and running.
__________________
We should not dwell on what we do not have, but, instead, be grateful for what we do have!
Last edited by smartx21; 23rd July 2011 at 12:47 PM. |
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