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Old 25th February 2011, 02:05 PM   #1
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Lightbulb Lux Corp s505 revival

Hi all,

I have a rather old Luxman Corp. s505 amp that I would like to bring back to life. Please be warned my electrical knowledge is not fantastic! If anyone has any more information on it that would be great.

I received it with a blown fuse, once replaced it blew again pretty much straight away and there was a fair amount of smoke coming from the area of the black cylinder with the ohm sign (some type of resistor?). Could anyone please help shed some light on if I can replace it and if so, where I could find something like that!

http://smg.photobucket.com/albums/v2...on/Lux%20s505/


Thanks!

Leon
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Old 26th February 2011, 09:59 PM   #2
ontoaba is offline ontoaba  Indonesia
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But, your link says page not found. Most blowing fuses caused by failure power devices, they could be transformer, power diodes (bridge), power transistors, or shorted cables or traces. You may check them out by using low voltage source (3.3V), and find out the warmed devices.
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Old 26th February 2011, 10:35 PM   #3
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Thank you for your insight, here is a new link Lux s505 pictures by dubleon - Photobucket
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Old 28th February 2011, 05:46 AM   #4
ontoaba is offline ontoaba  Indonesia
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The output transistor may broken. Replace it with equal transistor, and readjust the bias if necessary. Looks difficult to find the original, may be two of C1061 with proper Rbe to get close gain and readjust the bias, C1061 has been used in the same way by similar amplifiers. Or may be other transistors.
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Old 28th February 2011, 07:36 AM   #5
Mooly is offline Mooly  United Kingdom
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Almost certainly failed output transistors. Also probably driver transistors being damaged in the process together with perhaps other small components in the immediate area of circuitry.

Would have to see a circuit diagram...
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Old 28th February 2011, 03:13 PM   #6
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Thank you for the replies, It seem with balancing etc. it may be outside my skillset. Would anyone know of somebody reasonable in the Berkshire/Oxfordshire area of the UK?

Leon
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