eKirts...................you have a Personal Message!!
Tommy1000........Thank you for your suggestion. I did try this some years ago. I managed to discern the words for the different colours
If someone with a good up-to-date OCR program wants to try this I will gladly send then a couple of pages to scan.
Has anyone got contacts with Japanese students around the world? Perhaps we have a Uni professor here whose mate is a friend of a friend of an aquaintance teaching Japanese students
Tommy1000........Thank you for your suggestion. I did try this some years ago. I managed to discern the words for the different colours
If someone with a good up-to-date OCR program wants to try this I will gladly send then a couple of pages to scan.
Has anyone got contacts with Japanese students around the world? Perhaps we have a Uni professor here whose mate is a friend of a friend of an aquaintance teaching Japanese students
Hello BP and others,
Forgive me but I have lost heart here. My translator volunteers came up with NOTHING!
Despite the efforts I went to, to separate the large file into workable parts, and the promises I received of translation I never had any replies to the Luxman 504 project.
I get the feeling that either people join this forum to make a quick buck, or perhaps they see me as wanting to make a quick buck. I don't know!
My intentions are pure.
BigPanda, my reason for seeking a translation was to preserve a lost art in hard wired amp building for everyone to enjoy. Not just any amp, but one which surpassed all test results in its day and still survives. The components need replaced but the design was (and is ) revolutionary.
While I type this I am listening to 2 of these amps (nearly 30 yrs later) working at a very fast 'Rise Time' powering the treble in my speakers. The Krells are working the bass units and the Luxkit Z504's (on mono 240W Class A...to... AB) are pushing the German 'Manger' treble units at more than the specialised speed they require!
The clarity is sublime.............the heat in this room is equally tops
BigPanda..............I am in a dilema....... I don't want to give away this historical design to those who would seek to 'update' the design to today's microchips. I want, as much as you do, to preserve the 'hard wiring' and in particular, the ability for every aspiring amp builer or electronic engineer to learn from this. A hard wired amp which has survived the test of time.
Did I mention I eventually spoke with the original designer...Mr Johnny from Japan...and he told me that he is convinced that his design of the Z504 will never be beaten in the field it was designed for. At least not in his lifetime.
Yes I have a scan of the PCBs, Yes I have the original building instructions, and Yes I have 3 of these units. I can even send a spare working unit to someone interested in building a fresh unit. BUT......I want guarantees that the end result will be that ANYONE can build the Z504 using the supplied, translated, instructions.
To everyone on the forum......
If we have, (or you know of ), someone willing to financially sponsor a 'precise translation' of my 1984 electronic instruction manual for the Luxkit/Luxman Z504 then I would love to hear from you.
I make the promise that if a proper and safe translation is made of my build instructions then I will gladly submit one of my units for comparison tests.
This project is aimed only at promoting the self building of a powerful amp which is in danger of being lost in the quagmire of electronic extinction.
I myself would like to hear quotations from students, or businesses alike, willing to translate the full build manual from Japanese to English. If the cost is within my scope I may be able to stretch a little.
Keep this thread going please until every aspiring amp builer can build this amp!
What I would say is this...I am not in this for money....I am an Irishman.....Don't **** about.....I want everone capable of avoiding electric shocks to be able to build this.
Stephen
Forgive me but I have lost heart here. My translator volunteers came up with NOTHING!
Despite the efforts I went to, to separate the large file into workable parts, and the promises I received of translation I never had any replies to the Luxman 504 project.
I get the feeling that either people join this forum to make a quick buck, or perhaps they see me as wanting to make a quick buck. I don't know!
My intentions are pure.
BigPanda, my reason for seeking a translation was to preserve a lost art in hard wired amp building for everyone to enjoy. Not just any amp, but one which surpassed all test results in its day and still survives. The components need replaced but the design was (and is ) revolutionary.
While I type this I am listening to 2 of these amps (nearly 30 yrs later) working at a very fast 'Rise Time' powering the treble in my speakers. The Krells are working the bass units and the Luxkit Z504's (on mono 240W Class A...to... AB) are pushing the German 'Manger' treble units at more than the specialised speed they require!
The clarity is sublime.............the heat in this room is equally tops
BigPanda..............I am in a dilema....... I don't want to give away this historical design to those who would seek to 'update' the design to today's microchips. I want, as much as you do, to preserve the 'hard wiring' and in particular, the ability for every aspiring amp builer or electronic engineer to learn from this. A hard wired amp which has survived the test of time.
Did I mention I eventually spoke with the original designer...Mr Johnny from Japan...and he told me that he is convinced that his design of the Z504 will never be beaten in the field it was designed for. At least not in his lifetime.
Yes I have a scan of the PCBs, Yes I have the original building instructions, and Yes I have 3 of these units. I can even send a spare working unit to someone interested in building a fresh unit. BUT......I want guarantees that the end result will be that ANYONE can build the Z504 using the supplied, translated, instructions.
To everyone on the forum......
If we have, (or you know of ), someone willing to financially sponsor a 'precise translation' of my 1984 electronic instruction manual for the Luxkit/Luxman Z504 then I would love to hear from you.
I make the promise that if a proper and safe translation is made of my build instructions then I will gladly submit one of my units for comparison tests.
This project is aimed only at promoting the self building of a powerful amp which is in danger of being lost in the quagmire of electronic extinction.
I myself would like to hear quotations from students, or businesses alike, willing to translate the full build manual from Japanese to English. If the cost is within my scope I may be able to stretch a little.
Keep this thread going please until every aspiring amp builer can build this amp!
What I would say is this...I am not in this for money....I am an Irishman.....Don't **** about.....I want everone capable of avoiding electric shocks to be able to build this.
Stephen
Reeler,
That is not true. I did offer my help with the translations (post #17). You may have just skip over it. As for the boards, you don't have to send me. I just need the schematic and the scan of the boards (better with grids). That is good enough .
I am no 'big business'. The schematics cannot be stolen because it is available to everyone in the public (or am I wrong on that?)
BP
That is not true. I did offer my help with the translations (post #17). You may have just skip over it. As for the boards, you don't have to send me. I just need the schematic and the scan of the boards (better with grids). That is good enough .
I am no 'big business'. The schematics cannot be stolen because it is available to everyone in the public (or am I wrong on that?)
BP
I assume that Luxman still retains the copyrights for all of the Luxkit schematics.
That said, it is possible to buy a photocopy of the schematics for any of Luxman's kit designs (including the A501 and A504) from their service department for a nominal sum - about 1000 JP yen IIRC.
However, unless big power is needed, IMHO the later, lower-powered A902 is the better-sounding amplifier. Luxman will also sell these schematics upon request. Luxman will also sell you a photocopy of the complete builder's manual (which doesn't include the schematics), should you need one.
And if perusing the documentation triggers a desire for hands-on industrial espionage (^0^), it isn't hard to find working samples of the A501, A504, A902 etc. for sale on Yahoo's Japanese auction website.
IIRC, the 501 used a cascoded and current-mirrored JFET differential input, single common-emitter VAS with active loading, Darlington output with perhaps 2 parallel output pairs, and DC servo.
The 504 has similar topology, but runs on higher voltage rails, and has a Darlingont output with more devices - maybe 4 pairs.
The A902 has a cascoded and current-mirrored differential input, single common-base (folded-cascode) VAS with active loading, Darlington output with perhaps 3 parallel output pairs, and DC servo.
I have owned all of these amps, and consider them to be useful to learn from and experiment with.
That said, it is possible to buy a photocopy of the schematics for any of Luxman's kit designs (including the A501 and A504) from their service department for a nominal sum - about 1000 JP yen IIRC.
However, unless big power is needed, IMHO the later, lower-powered A902 is the better-sounding amplifier. Luxman will also sell these schematics upon request. Luxman will also sell you a photocopy of the complete builder's manual (which doesn't include the schematics), should you need one.
And if perusing the documentation triggers a desire for hands-on industrial espionage (^0^), it isn't hard to find working samples of the A501, A504, A902 etc. for sale on Yahoo's Japanese auction website.
IIRC, the 501 used a cascoded and current-mirrored JFET differential input, single common-emitter VAS with active loading, Darlington output with perhaps 2 parallel output pairs, and DC servo.
The 504 has similar topology, but runs on higher voltage rails, and has a Darlingont output with more devices - maybe 4 pairs.
The A902 has a cascoded and current-mirrored differential input, single common-base (folded-cascode) VAS with active loading, Darlington output with perhaps 3 parallel output pairs, and DC servo.
I have owned all of these amps, and consider them to be useful to learn from and experiment with.
I happen to have the the 504 schematics, what is this duo beta supposed to be, I dont see anything extraordinary about the design. That said I think Luxman was miles ahead of the pack regarding design, this luxman and others uses what we now call hawksford cascodes in the vas but the earliest use of this technique I have seen has been by Luxman form 1980 which predates hawksford by around 7 years. I have to wonder why its called hawksford cascodes and not luxman cascodes, I also havent been able to find any patent on this technique, anyone here know more ??
See US patent #3423685 for "Bootstrapped cascode differential amplifier", filed by Roy Hayes of Textronix in 1964, granted in 1969.
I believe that Luxman used "Duo Beta" to refer to their use of two parallel global NFB loops - one for the audio signal, and one for the DC servo.
LUXMAN L-58A
hth, jonathan carr
I believe that Luxman used "Duo Beta" to refer to their use of two parallel global NFB loops - one for the audio signal, and one for the DC servo.
LUXMAN L-58A
hth, jonathan carr
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