Luxman LX-33
I have a Lux LX-33 too for many years in 100% condition. Replacing the PSU cap is relatively simple. The triple-cap is impossible to obtain. However, there is an additional cap-hole covered with a black piece of sheet metal you can take out. This allows you to mount an additional can cap. When you re-arrange smartly you can mount all new caps (I used the great F&T Germany cans) using the extra mounting capability. I also replaced the rectifier diodes for ultra-fast versions, replaced the crappy speaker terminals with WBT, and the not-too-great signal caps on the 6CA7/EL34s for real audiophile PIO caps (Rike). A set of Philips NOS EL34s makes the whole thing complete. Oh, one last remark, rewire the speaker circuitry, the crappy headphone jack is in between using a very mediocre switch in your speaker wiring. Not useful to spend a couple of hundred $$ on Kimber & Co, with this switch in the circuit!
One last remark (see if I can revive this thread 🙂 this amp is for sale as well.
Triodes4ever.
I have a Lux LX-33 too for many years in 100% condition. Replacing the PSU cap is relatively simple. The triple-cap is impossible to obtain. However, there is an additional cap-hole covered with a black piece of sheet metal you can take out. This allows you to mount an additional can cap. When you re-arrange smartly you can mount all new caps (I used the great F&T Germany cans) using the extra mounting capability. I also replaced the rectifier diodes for ultra-fast versions, replaced the crappy speaker terminals with WBT, and the not-too-great signal caps on the 6CA7/EL34s for real audiophile PIO caps (Rike). A set of Philips NOS EL34s makes the whole thing complete. Oh, one last remark, rewire the speaker circuitry, the crappy headphone jack is in between using a very mediocre switch in your speaker wiring. Not useful to spend a couple of hundred $$ on Kimber & Co, with this switch in the circuit!
One last remark (see if I can revive this thread 🙂 this amp is for sale as well.
Triodes4ever.
Luxman LX-33 manual
Hello,
I am new to the forum and hope you will excuse my poor English!
I restore amps for several years
I recently bought a very beautiful Luxkit A-1033 (Luxman LX-33) in Japan
Not being sure of its operation, I will start it using a Variac and without the power tubes
I only found the schematics on the internet; unfortunately no voltage is indicated
Can anyone help me (voltages applied on the EL-34 tubes, voltages output from power transformer ...)
A manual even in Japanese would be very useful!
Here is a picture of my last restoration
Thank you for everything and thank you all!
Alain
Hello,
I am new to the forum and hope you will excuse my poor English!
I restore amps for several years
I recently bought a very beautiful Luxkit A-1033 (Luxman LX-33) in Japan
Not being sure of its operation, I will start it using a Variac and without the power tubes
I only found the schematics on the internet; unfortunately no voltage is indicated
Can anyone help me (voltages applied on the EL-34 tubes, voltages output from power transformer ...)
A manual even in Japanese would be very useful!
Here is a picture of my last restoration
Thank you for everything and thank you all!
Alain
Attachments
Many thanks for your reply
I still tried with "hifi-manuals" but impossible to upload : there is a systematic error message that I don't understand :
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I still tried with "hifi-manuals" but impossible to upload : there is a systematic error message that I don't understand :
"Deprecated: mysql_connect(): The mysql extension is deprecated and will be removed in the future: use mysqli or PDO instead in /pages/5c/1f/d0013250/home/htdocs/hifi-manuals.com/subdomains/download/httpdocs/download-v4.php on line 13
You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near '', `Manual_id` ) VALUES ( '83.113.179.22', '' at line 4"
As far as I know, there is no "official" schematic of the LX-33 on the net.
But there is one that I think was drawn from an actual amp. Despite being not too detailed, this schematic is sufficient to work on this amp.
Unfortunately no voltage on this schema, and I have worked on this amp long time ago so I don't have any detailed measurement for you either.
Since you have a variac, you can safely start up the amp and do some quick measurement on vital points (heaters, B+, bias...). Once decided that it's safe to go, you can applied full mains voltage, do measurements yourself, let us know and we can help you judge if the amp is working correctly or not.
However IIRC this amp runs with pretty high B+ even when loaded, it's very easy to surpass rating of power supply capacitors if you apply mains voltage without the EL34s.
I suggest you should disconnect the HT bridge from main transformer first, so that you can safely check the rest of the amp to make sure it will run (more or less) before apply B+.
Hope this helps.
Duong,
But there is one that I think was drawn from an actual amp. Despite being not too detailed, this schematic is sufficient to work on this amp.
Unfortunately no voltage on this schema, and I have worked on this amp long time ago so I don't have any detailed measurement for you either.
Since you have a variac, you can safely start up the amp and do some quick measurement on vital points (heaters, B+, bias...). Once decided that it's safe to go, you can applied full mains voltage, do measurements yourself, let us know and we can help you judge if the amp is working correctly or not.
However IIRC this amp runs with pretty high B+ even when loaded, it's very easy to surpass rating of power supply capacitors if you apply mains voltage without the EL34s.
I suggest you should disconnect the HT bridge from main transformer first, so that you can safely check the rest of the amp to make sure it will run (more or less) before apply B+.
Hope this helps.
Duong,
i will do this if i were you....
looking at the innards, i see three miniatures feeding the EL34's,
so i would hazard a guess, the your amp is mullard 5-20 like topology
but with a triode as first voltage amp...
last year i repaired a Luxman LX38 also could not find any scheme
so i just went ahead and repaired it anyway...
Hello Duong
I think you are wright, there is no reel schematic on the net, I'll do it myself...
Disconnect the HT bridge first and start slowly with the variac is a very good idea
If it works I'll change the componants anyway, power capacitors first.
I keep you informed
Thanks'
Alain
I think you are wright, there is no reel schematic on the net, I'll do it myself...
Disconnect the HT bridge first and start slowly with the variac is a very good idea
If it works I'll change the componants anyway, power capacitors first.
I keep you informed
Thanks'
Alain
Hi. I have a Luxman LX33 (bought in 1982) and would love to replace the speaker terminals with banana plug terminals like you did. Can you remember exactly which WBT speaker terminals you used and did you have to drill holes in the metal backplate of the LX33 to fit them? Thanks for any tips. I do like this amplifier.