tag:blogger.com,1999:blog-6835776463130464454.post701303552691742202..comments2024-02-28T11:45:09.883-06:00Comments on brahm: Rebuilding a 1977 Luxman L-30 Stereo AmplifierBrahmhttp://www.blogger.com/profile/10017359044901950872noreply@blogger.comBlogger17125tag:blogger.com,1999:blog-6835776463130464454.post-40778892848371519622023-02-19T08:26:02.445-06:002023-02-19T08:26:02.445-06:00Sorry for being over a year late replying to this,...Sorry for being over a year late replying to this, but the answer is yes!Brahmhttps://www.blogger.com/profile/10017359044901950872noreply@blogger.comtag:blogger.com,1999:blog-6835776463130464454.post-75108131633705633732023-02-19T08:25:02.101-06:002023-02-19T08:25:02.101-06:00Great and informative comment, thank you for shari...Great and informative comment, thank you for sharing your experiences! 🙂Brahmhttps://www.blogger.com/profile/10017359044901950872noreply@blogger.comtag:blogger.com,1999:blog-6835776463130464454.post-51973706701197767002023-02-19T02:49:20.118-06:002023-02-19T02:49:20.118-06:00I'm in the process of restoring one like this....I'm in the process of restoring one like this. Originally purchased in 1978 by my dad. Some remarks from dealing with my example:<br /><br />* Most of the capacitors had some minor leakage (it's not glue) and/or corrosion. They measured OK-ish with a DMM at first sight, but were usually 20-30% ABOVE the rated capacity. Combined with the crusty stains on the PCB and warbled bottom ends on the caps, I decided to replace them all. As if you need more signs of bad caps. I'm sure some were still good, but since it's open, I might as well replace them all (with decent Panasonic ones).<br /><br />* Even with a solder sucker, I went through A LOT of solder braid. During the assembly process, they clearly didn't spare any expense in that area since there is a giant amount of solder.<br /><br />* The traces seem to be glued to the PCB without a top layer, so they're pone to letting loose when introduced to heat and the wiggling from clumsy hands. Take your time during the desoldering process and be gentle when removing the bad components. Damaged traces could maybe be stuck into place with some PCB lacquer of sorts.<br /><br />* The grease under the four heat sinked Toshiba transistors was mostly dried up in mine. Check yours and add some when needed. Be aware that some thermal pastes are electrically conductive, so don't overdo it.De tettezaknoreply@blogger.comtag:blogger.com,1999:blog-6835776463130464454.post-54199946494977857842022-05-02T09:54:20.370-06:002022-05-02T09:54:20.370-06:00For treating rosewood or any wood combine 4 pts. m...For treating rosewood or any wood combine 4 pts. mineral spirits with 1 pt Double boiled linseed oil. Apply with a rag and buff after 15-20 minutes.Markushttps://www.blogger.com/profile/16744464933418616441noreply@blogger.comtag:blogger.com,1999:blog-6835776463130464454.post-14863592175513840932021-12-26T09:03:12.168-06:002021-12-26T09:03:12.168-06:00quick question about the transistors:
"The p...quick question about the transistors:<br /><br />"The pin-out of the new transistors (Emitter-Base-Collector) is different from the old (Emitter-Collector-Base)"<br /><br />does this mean when installing them, two of the legs need to be 'crossed over'?<br /><br />great guide by the way, looking forward to putting it to use! just need to order the parts in and i'll be set :DAnonymousnoreply@blogger.comtag:blogger.com,1999:blog-6835776463130464454.post-86315321075001129332021-11-11T09:35:01.773-06:002021-11-11T09:35:01.773-06:00To the original poster.
I think you will find tha...To the original poster.<br /><br />I think you will find that 99% of the time modern electrolytic capacitors are far superior to capacitors produced decades ago.Chris rhttps://www.blogger.com/profile/17030939163657170959noreply@blogger.comtag:blogger.com,1999:blog-6835776463130464454.post-25974190246577376962021-10-18T14:13:57.424-06:002021-10-18T14:13:57.424-06:00This is a great comment and totally fair! I hope o...This is a great comment and totally fair! I hope other folks read it before taking their gear apart. From my amateur perspective the glue/gunk myth goes deep - this comment is the first I've heard that nothing is actually wrong! <br /><br />My angle on this hobby is having fun with classic analog electronics. Since elementary school I've loved taking stuff apart, soldering components on circuit boards, and putting to back together. The majority of the quality difference (if any!) is in my head... and that's OK! Brahmhttps://www.blogger.com/profile/10017359044901950872noreply@blogger.comtag:blogger.com,1999:blog-6835776463130464454.post-20973545347381052082021-10-18T14:00:10.488-06:002021-10-18T14:00:10.488-06:00BU-P3750-0 (black) and BU-P3750-2 (red) from Muell...BU-P3750-0 (black) and BU-P3750-2 (red) from Mueller Electric Co, ordered from Digikey.caBrahmhttps://www.blogger.com/profile/10017359044901950872noreply@blogger.comtag:blogger.com,1999:blog-6835776463130464454.post-9212467108265267532021-08-16T12:55:34.542-06:002021-08-16T12:55:34.542-06:00the name of the binding posts ?
the name of the binding posts ?<br />Anonymoushttps://www.blogger.com/profile/03040017305688872075noreply@blogger.comtag:blogger.com,1999:blog-6835776463130464454.post-2980162624839305672021-07-09T19:58:09.376-06:002021-07-09T19:58:09.376-06:00great read
i just restored my first receiver a na...great read<br /><br />i just restored my first receiver a nad 3020<br />and my last original purchase a luxman r-117<br /><br />both are singing again !<br /><br />freecadancehttps://www.blogger.com/profile/08688170235282260785noreply@blogger.comtag:blogger.com,1999:blog-6835776463130464454.post-58046804050480117382021-04-13T05:43:01.475-06:002021-04-13T05:43:01.475-06:00Hola. Tengo un Luxman L-31. Hace muchos años comet...Hola. Tengo un Luxman L-31. Hace muchos años cometí un error de adolescente, y es poner algo encima del ampli.<br />Escuchando música salió un poco de humo y rápidamente lo apague.<br />Desde entonces, en estéreo no funciona el canal izquierdo. Me han recomendado un servicio técnico, pero para saber que tipo de reparación requiere, agradecería cualquier comentario.<br />GraciasAnonymoushttps://www.blogger.com/profile/03214568971681639662noreply@blogger.comtag:blogger.com,1999:blog-6835776463130464454.post-39193898919132608292021-01-02T04:24:22.243-06:002021-01-02T04:24:22.243-06:00I found the comment about the capacitators being g...I found the comment about the capacitators being glued very informative and useful. Agree, this is very well written and extremely helpful, but these kinds of corrections are also of great value.kjempedigerhttps://www.blogger.com/profile/13049870345247480632noreply@blogger.comtag:blogger.com,1999:blog-6835776463130464454.post-23091058090995910902020-11-19T11:00:55.042-06:002020-11-19T11:00:55.042-06:00Ok chill out! I don't even own an amplifier bu...Ok chill out! I don't even own an amplifier but I thought this was really well written, he obviously enjoyed doing it, learned a lot about focussing and the need for patience, and he had a great time with his uncle. Go rattle your cage somewhere else grandad. fernsnyder88https://www.blogger.com/profile/17796812924548202194noreply@blogger.comtag:blogger.com,1999:blog-6835776463130464454.post-51879025597643079892020-08-23T00:19:46.224-06:002020-08-23T00:19:46.224-06:00Le bois de rose demande un entretien très limité u...Le bois de rose demande un entretien très limité un chiffon humide et enduite de l'huile de lin laisser sécher et bon coup de chiffon doux et vous retrouverez une brillance et un aspect comme neuf.Anonymoushttps://www.blogger.com/profile/00182765307082762452noreply@blogger.comtag:blogger.com,1999:blog-6835776463130464454.post-13281115194300345782019-05-31T06:07:36.525-06:002019-05-31T06:07:36.525-06:00"Many of the original electrolytic capacitors..."Many of the original electrolytic capacitors had leaked their electrolyte gunk (see the big black one in the image below)."<br /><br />These capacitors are GLUED to the board in prior of soldering at the factory. This gunk you see is GLUE, not electrolyte. And these old capacitors are most likely absolutely FINE and the chances are high they are BETTER (made to a higher quality standard) than the modern ones you've replaced them with. I am yet to find a BAD Nichicon cap from 1970's.<br />There's far too much 'over restoring' carried out by people who come to the sport from non-electronics background, but hyped up by the hobby.<br />Anonymoushttps://www.blogger.com/profile/05195232424081146890noreply@blogger.comtag:blogger.com,1999:blog-6835776463130464454.post-1612157751489015832019-05-14T10:08:47.835-06:002019-05-14T10:08:47.835-06:00I have L30 since today:)
How to treat and maintain...I have L30 since today:)<br />How to treat and maintain rosewood?<br />Thanks in advanceAnonymoushttps://www.blogger.com/profile/12569456569250000606noreply@blogger.comtag:blogger.com,1999:blog-6835776463130464454.post-68244616155438978342019-04-01T09:23:44.120-06:002019-04-01T09:23:44.120-06:00After 50 years my Luxman L-30 that was given to me...After 50 years my Luxman L-30 that was given to me by my younger brother as a wedding gift finally gave up the ghost this weekend past. I took it apart today hoping to see something obviously wrong, and it appears that three (capacitors?) are melted somewhat. I am not electronically trained but I thought I would see if there was anything online that could be of use. Boy did I hit the jackpot! This is exactly the kind of description of a solution to a problem that you wish everyone who contributes to the internet would be capable of posting. I thank you sir, for the Luxman L-30 remains as the only thing that survived that ill-fated union, and the only thing worth reviving.Anonymoushttps://www.blogger.com/profile/04608476977981760342noreply@blogger.com