Lux Corp s505 revival

dubleon · 25th February 2011, 02:05 PM

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

ontoaba · 26th February 2011, 09:59 PM

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.

dubleon · 26th February 2011, 10:35 PM

Thank you for your insight, here is a new link Lux s505 pictures by dubleon - Photobucket

ontoaba · 28th February 2011, 05:46 AM

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.

Mooly · 28th February 2011, 07:36 AM

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...

dubleon · 28th February 2011, 03:13 PM

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

25th February 2011, 02:05 PM	#1
dubleon diyAudio Member Join Date: Feb 2011	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

28th February 2011, 07:36 AM	#5
Mooly diyAudio Moderator Join Date: Sep 2007	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... __________________ ------------------------------------------------------- *A simulation free zone.* *Design it, build it, test it.*

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26th February 2011, 09:59 PM	#2
ontoaba diyAudio Member Join Date: Nov 2009 Location: Kudus, & Malang	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.

26th February 2011, 10:35 PM	#3
dubleon diyAudio Member Join Date: Feb 2011	Thank you for your insight, here is a new link Lux s505 pictures by dubleon - Photobucket

28th February 2011, 05:46 AM	#4
ontoaba diyAudio Member Join Date: Nov 2009 Location: Kudus, & Malang	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.

28th February 2011, 03:13 PM	#6
dubleon diyAudio Member Join Date: Feb 2011	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