| Valerio |
hi global people, I need your help, could you send me a copy of instruction manual for ampli Luxman LV-105? My adress is v.frigati@virgilio.it
Thanks in advance for your interest |
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| joan2 |
i also need schematic for the above amp, i had an lv105 which i fixed by taking good mosfets from this amp, the amps used the same trannies in the output stage-2sk405/2sj115...now all four mosfet output trannies are bad....for the lv103, i intend to replace the mosfet outputs with darlington bipolars byt modding the output drivers and bias circuits, but i need the schematics in order to proceed...
calling on netlist, please help!!!!
thanks a lot in advance.... |
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| herringboy |
Hi all,
I just bought a 103 and do not have a manual - if anyone could help that would be great.
Also, can you change the valves in these for a better or differnt sound?
Cheers
Carl |
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| anatech |
Hey these sound pretty good actually!
You can modify the bias circuit to use IRFP fets (140 / 9140). They have low impedance gate drive, so you don't run into the IRFP140 gate charge issues as much. I would rather do that than modify for bipolar output, although it is not that hard to change. It's just that it would be a completely different animal then.
When replaceing the fets, check the gate resistors. If they open, you will blow the new parts for sure.
-Chris |
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| nuppe |
Hi, just wanted to tell you all, i bought two manuals for my Luxman L-114A (service & owners manual) from a guy called Sven Eiman in Sweden. He has a website were he sells manuals and spare parts for Luxman. I payed 110 sek (about 10 €) for both, and they were original in pristine condition. I think he delivers abroad too.
/Andreas |
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| max romeo 007 |
Hi Everyone
I Have been on many web sites and forums looking for a FREE FRENCH copy of Luxman LV-103 or LV-105 owner's manual (PDF, Gif or Jpeg format) and I could not find any. If somebody can supply me one, it would be greatly appreciated. You can send me an e-mail at the following address: max_romeo_007@hotmail.com.
Have fun and be Happy
Max |
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| Netlist |
| quote: | Originally posted by joan2
calling on netlist, please help!!!!
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Sorry guys, nothing from Luxman here.
/Hugo :) |
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| ilimzn |
| quote: | Originally posted by anatech
Hey these sound pretty good actually!
You can modify the bias circuit to use IRFP fets (140 / 9140). They have low impedance gate drive, so you don't run into the IRFP140 gate charge issues as much. I would rather do that than modify for bipolar output, although it is not that hard to change. It's just that it would be a completely different animal then.
When replaceing the fets, check the gate resistors. If they open, you will blow the new parts for sure.
-Chris |
The mod you describe would only work for the 103 for sure (rail voltages!). You may find that IRFP240 and IRFP9140 are FAR better pairs than 140/9140 or 240/9240, assuming the rail voltage is below +-45V at all times. In fact, out of all IRFP parts, 240/9140 are the closest you get to true complementaries, rivaling even the actual lateral complementaries. On average, the P/N ch differences of this pair will be about the same as toleraces between any two parts of the same polarity. In contrast, IRFP140/9140 and 240/9240 differ between 30 and 50% in gain (gm). IRFP240/9140 differ below 5% and typically 3%, plus the capacitances are much better balanced between P and N.
I have also successfully repaired LV103 and LV105 with 2SJ162 and 2SK1058 LMOS, with no mods to the driver. The gate capacitances are still within limits for the driver. |
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| boraomega |
| 2SJ162 and 2SK1058 are much better and much closer replacement than any IRFP. |
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| anatech |
Hi ilimzn,
Correct on the 240 / 9240 's for the LV-105. I have easy access to the IRF parts in Canada, my good supplier for Japanese parts closed up shop due to economic reasons. These are from my Adcom stock ;) .
I think my main point was to illustrate the driver circuit in the Luxman units was capable of driving the gates of the IRF parts ( the worst to drive as far as I'm concerned).
-Chris |
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| ilimzn |
| quote: | Originally posted by anatech
Hi ilimzn,
Correct on the 240 / 9240 's for the LV-105. I have easy access to the IRF parts in Canada, my good supplier for Japanese parts closed up shop due to economic reasons. These are from my Adcom stock ;) .
I think my main point was to illustrate the driver circuit in the Luxman units was capable of driving the gates of the IRF parts ( the worst to drive as far as I'm concerned).
-Chris |
Well, they are not THAT bad, unless you need to drive more than one pair. But, the IRFPs that the data says are complements, really are not, and that is usually the culprit for their reputation for being worse sounding (to put it mildly).
For ove 95V rail to rail, the best I have managed is IRFP9240 for the P part and IRF 340 for the N part. On average they differ about 7% on gm, and are pretty well matched capacitance-wise. In contrast, IRFP240 and 9240 differ by as much as 50% on gm, hardly what one would call complementary.
My reasons for using them were originally that I could get 5 IRFP parts for one 2SJ/2SK. Since then, having invested a lot of time into the complementarity issue, I have concluded that the myth of their inferior sound is just that - a myth. Yet, people still take IRFPxxx and IRFP9xxx to be complements if the xxx is the same number. The only thing they are complements on is the maximum Vds, and nothing much more than that. Once you get past it, they reveal themselves to be unbeatable price/performance wise, and not just because their price is low. |
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| anatech |
Hi ilimzn,
I'll believe that 100%. Even the International Rectifier shows them as complimentary pairs. Adcom used them that way (and many others). This is why I have them, for warranty replacement. I'll have to try your suggestion - thanks for the info.
My reason for calling them tough to drive properly is their gate drive characteristic. The gate abruptly changes charge rates as you increase the gate source voltage. The standard TO-92 type transistor, or worse, a vacuum tube will not properly drive these. You need a lower impedance drive circuit and more feedback to compensate. The lateral fets have a much more linear gate characteristic. That means you can make a design mistake (low drive current) and it will not sound horrible.
It would be interesting to swap the fets in a Counterpoint SA-100 and see how it sounds. It just has to sound way better.
-Chris |
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| ilimzn |
Chris,
The situation is not that bad because it largely happens only under speciffic circumstances. In particular:
- Vgs close to Vgs@Idmax for the part - typically 5-6V on VMOS.
- Low Vds - typically below 10V for VMOS, this is when capacitance nonlinearity becomes very evident
- Common source connection
What this sums up as is, Vd ~~ Vg, in a typical amplifier this only happens when the output voltage and output current are close to maximum simultaneously. That being said, LMOS has a different gate geometry, but it still suffers from the same basic problem, just less - and not even a whole lot less. In fact, for rail voltages below +-45V, one can often use one pair of IRFP VMOS instead of two pairs of LMOS, at which point LMOS loses it's advantage on better gate charge characteristics. On higher rail voltages, in domestic use it is less likely you will encounter operating conditions as above, when gate charge problems become evident on VMOS (and LMOS, just less intensive).
The above is one good argument or DC coupling the tube stage to the MOS output (though it does generate a different set of problems to deal with downstream). Unless very large coupling caps are used (and this can be a problem becvause these often need to be high voltage), the gate charge step tends to reflect on the voltage of the coupling caps, in particular, for small coupling caps, you get a 'rectification' effectsimilar to what happens when the driving voltage on the SS side is clamped. For a while (which the amp needs to spend amplifying signals well below clipping), the bias current is suboptimal, until the coupling caps recharge. The gate charge step generates a less pronounced version of the effect well before clipping, and also produces dual 'notch' type distoprtion, which means high harmonic content (4th and over) - compounding the possible low bias problem.
As you say, the only real way around it is having a lot more drive current than raw gate capacitance figures suggest, by lowering gate capacitances and gate charge storage effects, and/or using larger tubes or an extra SS driver stage for the MOSFETs. |
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| anatech |
Hi ilimzn,
I will agree and add that most mosfet output stages are common source. On top of this, most designs deliver inadequate drive current to the gates. I've often said that you need a bipolar power output stage to properly drive gate charge in the vertical type fets. This is to avoid the double notch type distortion. Obviously you can use a fet driver as well but I am just making a point. The "power" stage I refer to is enough to dissipate the standing power from the quiescent current required.
An intermediate stage between the coupling cap in a tube stage and the output fet stage would solve those problems and bring a higher degree of safety to the design. The aim of the driver would be to present a more constant impedance to the VAS stage and thus linearize the output stage. I did this with a bipolar output with very positive results (driven by a tube stage).
I like using Counterpoint as a model because it falls short in many areas and illustrates well the problems with this topology. It's also an easy design to understand for those who are learning.
-Chris |
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| 16vRocket |
| Sorry for hi-jacking this thread, but I cant believe I've found some people that know about the LV-105. I've been trying for the past 8 or 9 years to get my fathers LV-105 repaired as I damaged it while playing my music a little loud, but have never been able to find a place that will fix it. The amplifier comes on and the tubes light up and what not but it's supposed to "click" when it's ready, but it never does. MOSFET's possibly?? I brought it to a place to have it looked at when it first went, and they said it was some overload chip that died and they could not get parts. Does anyone know of a place that will service LUX or know how to fix it?? Thanks, and look forward to hearing from you. |
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| anatech |
Hi 16vRocket,
PM me. You are reasonably close to me. I have the manual and used to service them under warranty. bhome at sympatico dot ca
I'm in Georgetown
-Chris |
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| Euge555 |
Dear Chris!
Send me, please, any information (manuals) for lv-105.
Eugene< Ukraine ea@ipnet.kiev.ua |
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| anatech |
Hi Euge555,
They are on paper, not scanned. I'll have a look around ....
-Chris |
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| Euge555 |
Dear friends.
I need a manuals for amplifier LV-105 (not 105U).
Also I need a servise manuals for CD-player LUXMAN (tube) D-105U.
If somebody has this documents, please, send me. |
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| parsecaudio |
Hi Euge555 and all diyAudio friends,
Tomorrow I will upload the schematic for the Luxman D-107U(closest similar toD-105U)
on the site http://fileshare.eshop.bg
The file is big(20MB) in 9 parts and I have only 56k modem.....
Please be patient
Cheers
;) |
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| oakao |
Hi:
My LV-105(not 105u) just turned dumb. Could anyone send me a copy of Service Manual?
If anyone could suggest possible problem, will oblige.
(The tubes glow, and the heat sink warmed up.....)
Thanks in advance!
oakao
oakao@canada.com |
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| oakao |
Oh yeah, one more question.
My LV-105 is 220V. version. I have been using step up transformer always, not a big deal though, but any easy way to modify it to 120V? beg for a suggestion.
oakao
oakao@canada.com |
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| anatech |
Hi oakao,
Check the power supply.
I don't know if yours has 120 V taps. The CSA/UL models do not have 220V taps.
Where are you located?
-Chris |
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| oakao |
Hi Chris (Anatech):
Thank you for replying.
I read from forums, there maybe 3 versions, CSA/UL, M, and a 3rd that is switchable between 220/120. Maybe I send you a picture of the power tap pcb see what it is with mine.
Any tips for me on getting a copy of service manual?
I'm in GTA.
B. rgds,
Clem (oakao) |
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| anatech |
Hi Clem,That's great. You are close enough for me to help you out if need be.
-Chris |
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| oakao |
Hi Chris and fellow folks:
With the very little time and knowledge I have, I read your exchange of ideas here on LV105 (including LV103), likely the FETs, Q's and the driving gates are something common in causing problems. Would it be a clear cut to just change all of them? Am I to understand correctly or not?
As I told you, my LV 105 gone dumb. No hissssss no hum from any inputs gangs. I have spent a bit of time to look into it in brief:
1. when power on, it came up.
2. both tubes glew.
3. 4 LEDs on PCB glew.
4. Heat Sink warmed up, BUT, when I used my finger to touch it, appeared to me right side was vey hot and left side was just warm. I further felt the FETs, same result. The R channel's are very hot, and not really for the L.
What would be problem of mine?
Am I still expecting your reply on 105 and 105u? Voltage change is not really a big issue though, as I can use transformer.
Happy Easter!
Clem |
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| MMeche |
While I was reading your thread, my LV-105 started acting up. I was about to try figuring out why the CD input was a mess, everthing else worked fine. Then the amp starts clicking in and out whenever I try to drive it. I can get a bit of signal for a brief period at low levels then is just clicks out. It sounds like protection but it can't be thermal, it starts before the thing is warm.
BTW--I have a pdf of the service manual. Its too big to upload here but I can try to email it if anyone needs it. |
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| Tony |
| quote: | | As I told you, my LV 105 gone dumb. No hissssss no hum from any inputs gangs. |
does the output relay click? if not then you have output off-sett problem, the relay won't kick in to protect your speakers...
as to the heatsinks getting hot, you probably have higher bias setting in the other channel, otherwise, it could be ringing.... |
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| oakao |
I'm unlikely able to fix my LV 105. May consider to sell it "as is" to someone who can make good use of it. Any one interested?
Make an offer!
oakao@canada.com |
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| Inno |
| quote: | Originally posted by ilimzn
I have also successfully repaired LV103 and LV105 with 2SJ162 and 2SK1058 LMOS, with no mods to the driver. The gate capacitances are still within limits for the driver. |
Hi all, I'm new here but I have an LV-105 with one bad channel which of course prevents the protection cct from kicking it on. I've found one open resistor (a 430ohm) and I'm guessing I'll have to replace the outputs etc.
So if I'm reading this correctly the original 2SK405 and 2SJ115 are no longer available and a good substitute would be the above mentioned units and there are no modifications necessary?
I'm guessing though that I'd want to replace both channels to keep things even.
Thanks |
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| Sinergy |
Hi all, I have a luxman lv-105 that went dumb too. I have successfully repaired it by replacing all the transistors/FETs on the main board and the driver board which was located under the main pcb on mine.
I have the manual for it for anyone who needs it ;)
http://rapidshare.com/files/102029430/LV105.pdf.html
I got my parts from here.
http://www.audiolabga.com/
The parts I used:
2sk1529 x2
2sj200 x2
2sa1321 x2
2sa1360 x4
2sc3423 x10
2sc1815 x6
2sa733 x2
2sc3378 x2
2sa970 x1 |
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| Ricdelros |
Hi DIYers,
Sorry to interrupt you. I'm new to this thread.
I have just bought a junk Luxman F-105. Unfortunately, upon powering-up, it didn'nt work. When I open the
cage, i found out that there's a missing IC and a 2nd transformer. A transformer maybe used to power the
video sect or surround circuit.
I believe it was junked due to maybe there's no vailable parts in our place. the transformer no. is T-845.
Is there any one out there who can help me find a schematic
so that I can rewind the transformer. any one who can figure-out what voltages this transformer has.
thanks,
Ric |
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| ilimzn |
A couple of things tend to go wrong with the LV103/105:
1) Dead output FETs (usually by mishap, short on output etc, but can happen because of some of the following faults). Use standard methods to fix... original FETs are no longer available, use K1529/J200, with a bit of work (due to larger case) the circuit will also drive K1530/J201 with no trouble, and be somewhat more robust. For optimum results bias current will have to be pushed into the 150mA range for the K1529/J200, and up to 200mA for the K1530/J200. Unfortunately this will increase the heat generated. it is also possible to use IRFP240/9140 on the 103, or 340/9240 on the 105, even though IRFP240/9240 will also work (and not be nearly ideally complementary), in all cases IRFP parts need changes to the bias servo circuit to account for the higher treshold voltage of these MOSFETs.
2) Dead power supply caps, particulairly the DC heater circuit filter cap tends to get fried by the heater circuit rectifier which is very near it. Replace bridge with one on longer leads and a heatsink, or even better, with schottky diodes. Check the power supply PCB for heat damage due to overheating bridge. In some cases the bridge fails and explosively destroys the cap...
3) Cold solder joints on the main amp and/or tube daughterboard. There is a lot of heat going on there with the high supply voltages and many cascoded BJTs in a tight space, also tube sockets and tubes, and all of it on phenolic resin boards. Sometimes the boards themselves have so much thermal dilation they can crack (espacially the tube daughterboards). The parts themselves usualy do not fail, rather the solder joints do, then the circuit msbehaves and something fails. Resoldering with lead free solder can cure this, it has a higher melting point, however, this will be moot if the board is thermally damaged or cracked. Check the electrolytics on that board, they tend to get cooked by the surrounding parts :( |
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| Tony |
| quote: | Originally posted by Ricdelros
Hi DIYers,
Sorry to interrupt you. I'm new to this thread.
I have just bought a junk Luxman F-105. Unfortunately, upon powering-up, it didn'nt work. When I open the
cage, i found out that there's a missing IC and a 2nd transformer. A transformer maybe used to power the
video sect or surround circuit.
I believe it was junked due to maybe there's no vailable parts in our place. the transformer no. is T-845.
Is there any one out there who can help me find a schematic
so that I can rewind the transformer. any one who can figure-out what voltages this transformer has.
thanks,
Ric |
i believe that is the filament transformer for the two 6cg7 vas stage of the amp...is your LV-105 a japanese unit? |
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| Ricdelros |
my Luxman F-105 is a japanese made
solid state surround type amplifier |
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| ilimzn |
| quote: | Originally posted by Ricdelros
my Luxman F-105 is a japanese made
solid state surround type amplifier |
So, the question is, why do you ask about it in a thread about a Luxman tube hybrid stereo amp? |
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| Tony |
| hey Ric, fire me an email and i will send you the schemes ; antonio.tecson_at_kentech.ie |
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| finvarg |
Want to know Luxman lv-105 (220v model) power transformer output voltage. Can anyone help me?
Maybie can measure it? Service manual is not contains this information... |
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