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Old 21st June 2011, 08:23 AM   #71
Junm is offline Junm  Philippines
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Thanks, I will visit these stores whenever i go purchase my parts...

Tonight i will try to continue troubleshooting and test the trafo..if it is dead I will rewind and convert it to 220v as well including the main Trafo.

BTW,do you have any idea what is the secondary output voltage of the 2 windings of the filament trafo...i dont see it in the manual..
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Old 21st June 2011, 09:33 AM   #72
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yes, those small traffos only appear on japanese local units, IOW, domestic sales units....they are not shown in the downloaded manuals for export units...

so when i get to rebuild the traffos, i will integrate them to the main transformer...those 2 traffos seem to have 12volts secondaries...

there are 2 traffos for the LV-103, and just 1 forthe LV-105, they are of the same size...

i was testing the one from the LV105 and i fed it with 150 volts ac, no overheating or anything.....will try to feed 220 volts and see of it gets shot....the other 2 from the LV103 are shot anyway....
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Last edited by AJT; 21st June 2011 at 09:36 AM.
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Old 22nd June 2011, 01:24 AM   #73
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Quote:
Originally Posted by Tony View Post
yes, those small traffos only appear on japanese local units, IOW, domestic sales units....they are not shown in the downloaded manuals for export units...

so when i get to rebuild the traffos, i will integrate them to the main transformer...those 2 traffos seem to have 12volts secondaries...

there are 2 traffos for the LV-103, and just 1 forthe LV-105, they are of the same size...

i was testing the one from the LV105 and i fed it with 150 volts ac, no overheating or anything.....will try to feed 220 volts and see of it gets shot....the other 2 from the LV103 are shot anyway....
Mine has only one small filament trafo (jK Version). I tested it last nite and found out that the primary winding was busted. When I look at the transformer there's a voltage written as 13.1 V, 13.5VA. the problem is , it has two secondary winding (yellow-red at 2.5ohm winding resistance) and Blue-black at 1.7 ohms winding resistance). I just dont know if the 13.1v written is common to both winding or total voltage of the two windings. Or they are both 13.1v at different coil diameter (amperage) that causes the variation in coil resistance?

Does anybody here know the filament trafo's secondary windings?
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Old 22nd June 2011, 01:40 AM   #74
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Some pix of my Luxman LV-103..
Attached Images
File Type: jpg Filament Trafo.jpg (53.0 KB, 128 views)
File Type: jpg Front.jpg (119.1 KB, 124 views)
File Type: jpg Tube window.jpg (86.9 KB, 124 views)
File Type: jpg Inside.jpg (209.3 KB, 122 views)
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Old 22nd June 2011, 02:46 AM   #75
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Quote:
Originally Posted by Junm View Post
Mine has only one small filament trafo (jK Version). I tested it last nite and found out that the primary winding was busted. When I look at the transformer there's a voltage written as 13.1 V, 13.5VA. the problem is , it has two secondary winding (yellow-red at 2.5ohm winding resistance) and Blue-black at 1.7 ohms winding resistance). I just dont know if the 13.1v written is common to both winding or total voltage of the two windings. Or they are both 13.1v at different coil diameter (amperage) that causes the variation in coil resistance?

Does anybody here know the filament trafo's secondary windings?

there's your answer right there...

the difference in resistance is due to the fact that one winding is on top of another, the outer winding will have longer mean lenght per turn, so that it has higher dc resistance....

you can send that traffo to me if you like and i will send you the working traffo...

now, in case you convert your main traffo to 220 volts, you can provide a 100volt tap for that traffo...
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Old 22nd June 2011, 03:02 AM   #76
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Thanks sir Tony for the clarification so now i can proceed...
I'm planning to have it rewind and put 2 110v primary tap for future 220v conversion.

If I send it to you...where is your exact shop location/address? You can email me at jun.mabanta@phl.fujixerox.com...i can give you my exact billing address too.
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Old 15th August 2011, 07:23 AM   #77
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Default LV-103 goes to work..

Finally i had fixed and restored my hybrid luxman... filament trafo was rewinded and output mosfets were replaced with lateral ones (k1058 and J162). Just did some modification on VBe multiplier by paralleling 1k resistor with upper 1.5k as indicated in the schema and succesfully adjust bias at around 100 mA.Without modification , bias is at 160 ma and VR is already at minimum, so need to adjust lower else heatsink is not sufficient.

I just encountered big offset on the other channel due to feeled off tracks to the base of driver transistor. fixed and done.

I'm planning to increase the 47uf BP feedback cap to higher value of around 470uf and bypass with 0.1uf mylar to increase bass performance..will it do?
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Old 15th August 2011, 07:45 AM   #78
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hi, may i ask where you got your power transistors? nice job btw.....

i see no reason to change that 47ufd bp cap....i will leave it as it is if is is still good....
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Old 15th August 2011, 08:08 AM   #79
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since you ve done so many ....you might as well take alook on the capacitors of your machine ....
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Old 15th August 2011, 08:36 AM   #80
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Quote:
Originally Posted by Tony View Post
hi, may i ask where you got your power transistors? nice job btw.....

i see no reason to change that 47ufd bp cap....i will leave it as it is if is is still good....
Hi sir tony, I got my mosfet thru internet( ebay). I had ordered 4 pairs but i waited for about 2 months to arrive.

the Caps are ELNA BP caps (for audio tag), I'm was thinking if im going to replace this with nichicon 100 uf to further improve bass. I like the sound its smooth and good on highs but for me it lacks hard bass.

Some of the caps are tainted due to long storage and but i think they still work fine.
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