Hello,
I would like to show you some photos of my M166 Gradient Amp (Brazilian brand). I bought this amp used with several problems and very dirty and I made the total restoration. I even changed the VU Leds to white and blue.
Fell free in give your comments.
Regards,
Julio.
I would like to show you some photos of my M166 Gradient Amp (Brazilian brand). I bought this amp used with several problems and very dirty and I made the total restoration. I even changed the VU Leds to white and blue.
Fell free in give your comments.
Regards,
Julio.
Attachments
Nice amplifier Binary....muito bom mesmo
This is the best amplifier made in the eighties, one of the best we have made in this country.... it is one of the five best ones.
Este amplificador é excelente, eu adoro a sonoridade dêle, e você fez um belo trabalho, parabéns.
regards,
Carlos
This is the best amplifier made in the eighties, one of the best we have made in this country.... it is one of the five best ones.
Este amplificador é excelente, eu adoro a sonoridade dêle, e você fez um belo trabalho, parabéns.
regards,
Carlos
Attachments
If you have schematic, please, post it here.
I think i have not, but finding the schematic, i will produce two channels to listen them once again, as it produces a very soft bass and beautifull voices.
The top high frequencies seems a little bit mufled to me...but this is something we can arrange inside the circuit caps, installing better tweeter or arranging speaker crossover.... seems to me, this is personal, subjective feelings...my own evaluation.
Thank you for publish our things here.
regards,
Carlos
I think i have not, but finding the schematic, i will produce two channels to listen them once again, as it produces a very soft bass and beautifull voices.
The top high frequencies seems a little bit mufled to me...but this is something we can arrange inside the circuit caps, installing better tweeter or arranging speaker crossover.... seems to me, this is personal, subjective feelings...my own evaluation.
Thank you for publish our things here.
regards,
Carlos
Attachments
http://www.geocities.com/fabiomauriciotimi/faq.htm
I get the original output stage transistors for M-166 are:
Toshiba 2SA-1146 and 2SC-2706
Thanks man.
The basically the restoration was made followings steps:
-The chassis was completely disassembled
-All parts, were cleaned one by one, several metal parts were washed with soap.
-All cables were replaced
-Several screws were replaced.
-The pcbs were washed with isopropylic alcohol and applied the protective resin
-Several small electrolytics were replaced.
-Volume potentiometer replaced.
-The electrolytic of power supply filter were replaced from 2 x 4700uF by 2 x 10.000uF.
-The pair output transistors of 1 channel were replaced by originals
-Reactivation of Super A circuitry
-The original VU led were green, yellow and red, so I decided to change the leds by new ones, with color white and blue.
-The VU window, knobs and pannel were polite.
-And some other things.
Yes, it was a lot of work, actually 3 weeks, working on weekends or at night after the work. But the result was a prize. Beautiful, clear and “warm” sound, punch bass.
It has aprox 90WRMS (8ohms) total power output, but sounds like a 200WRMS amp.
Note: Below is the photo of pcb power amp before assembly. Here is an enhancement: the Super A bias transistors were glued with epoxy in an aluminum base and assembled to heat sink. I had to do this because the original solution was very poor.
Regards,
Julio.
The basically the restoration was made followings steps:
-The chassis was completely disassembled
-All parts, were cleaned one by one, several metal parts were washed with soap.
-All cables were replaced
-Several screws were replaced.
-The pcbs were washed with isopropylic alcohol and applied the protective resin
-Several small electrolytics were replaced.
-Volume potentiometer replaced.
-The electrolytic of power supply filter were replaced from 2 x 4700uF by 2 x 10.000uF.
-The pair output transistors of 1 channel were replaced by originals
-Reactivation of Super A circuitry
-The original VU led were green, yellow and red, so I decided to change the leds by new ones, with color white and blue.
-The VU window, knobs and pannel were polite.
-And some other things.
Yes, it was a lot of work, actually 3 weeks, working on weekends or at night after the work. But the result was a prize. Beautiful, clear and “warm” sound, punch bass.
It has aprox 90WRMS (8ohms) total power output, but sounds like a 200WRMS amp.
Note: Below is the photo of pcb power amp before assembly. Here is an enhancement: the Super A bias transistors were glued with epoxy in an aluminum base and assembled to heat sink. I had to do this because the original solution was very poor.
Regards,
Julio.
Attachments
Very good, you made some "overhaulin" in your machine
Very good work, and very good amplifier, sounds very nice....a precious unit...take care of it, there's a lot of guys searching for this model in used shops.
Very well constructed, small, ligthweigth, heavy sound, slim line, good range on controls...very nice.
Este som é muito legal.
Carlos
Very good work, and very good amplifier, sounds very nice....a precious unit...take care of it, there's a lot of guys searching for this model in used shops.
Very well constructed, small, ligthweigth, heavy sound, slim line, good range on controls...very nice.
Este som é muito legal.
Carlos
Attachments
I use to put amplifiers under watter and soap and i forget them there for some hours.
Of course transformers and galvanometers, meters, are removed.
them i use some soft brush and finished with watter under pressure and air under pressure.
Them it rest under the sunligth for some hours.
When rust is found, i use some chemical material that finishes with rust, and them varnish over the old rust parts....if not nice...steel brush give a nice finish in the oxide attacked parts....not common on Gradiente, they normally do not have problems of oxide.
regards,
Carlos
Of course transformers and galvanometers, meters, are removed.
them i use some soft brush and finished with watter under pressure and air under pressure.
Them it rest under the sunligth for some hours.
When rust is found, i use some chemical material that finishes with rust, and them varnish over the old rust parts....if not nice...steel brush give a nice finish in the oxide attacked parts....not common on Gradiente, they normally do not have problems of oxide.
regards,
Carlos
Attachments
Carlos, thanks for the words.
Of course, here is the schematic:
http://rapidshare.de/files/12035366/100_0658.jpg.html
I have uploaded it on Rapidshare. Just download it.
Cheers.
Julio.
Of course, here is the schematic:
http://rapidshare.de/files/12035366/100_0658.jpg.html
I have uploaded it on Rapidshare. Just download it.
Cheers.
Julio.
Julio, obrigado, thank you.
Very kind from you.
Falado amigo, na boa, obrigadão.....mas poderia me instruir como achar o arquivo lá...só encontrei a pagina geral cheia de propagandas.
Thank you, but can you, please, instruct me how to find the file there?, i found only the home page with many advertising, no link to archived files there.
To be faster, can you send them to my mail?
nanabrother@yahoo.com
regards,
Carlos
Very kind from you.
Falado amigo, na boa, obrigadão.....mas poderia me instruir como achar o arquivo lá...só encontrei a pagina geral cheia de propagandas.
Thank you, but can you, please, instruct me how to find the file there?, i found only the home page with many advertising, no link to archived files there.
To be faster, can you send them to my mail?
nanabrother@yahoo.com
regards,
Carlos
Carlos,
Clique no link, quando abrir a pagina va ate a parte inferior da pagina, clique no botao "free".
Abre-se uma nova tela, que pede que voce aguarde cerca de 30 segundos. Apos este tempo, na parte inferior da tela, aparece um codigo de 3 letras coloridas. Voce digita este codigo no campo indicado e o download inicia.
Qualquer problema, é só avisar.
Valeu.
Julio.
Clique no link, quando abrir a pagina va ate a parte inferior da pagina, clique no botao "free".
Abre-se uma nova tela, que pede que voce aguarde cerca de 30 segundos. Apos este tempo, na parte inferior da tela, aparece um codigo de 3 letras coloridas. Voce digita este codigo no campo indicado e o download inicia.
Qualquer problema, é só avisar.
Valeu.
Julio.
This schematic is almost the same of this Super A, auto bias , class A to AB Gradient
Receiver...the model is 366 or something...i do not remenber exactly the model, i have to search for it...for the correct model numbers.
It works with triple darlington in the output, have the same kind of protection, and this one has a dinamic bias.... low power it works in class A, and very hot..... when power increase it reduces the bias to operate in class AB.
It was the best amplifier ever made, from Gradiente, to home use...i suppose was a JVC license design.
If someone interested....i will attach the pdf in the next mail.
regards,
Carlos
Receiver...the model is 366 or something...i do not remenber exactly the model, i have to search for it...for the correct model numbers.
It works with triple darlington in the output, have the same kind of protection, and this one has a dinamic bias.... low power it works in class A, and very hot..... when power increase it reduces the bias to operate in class AB.
It was the best amplifier ever made, from Gradiente, to home use...i suppose was a JVC license design.
If someone interested....i will attach the pdf in the next mail.
regards,
Carlos
Attachments
Re: Nice amplifier Binary....muito bom mesmo
Julio, nice work !
It is very nice to do a restoration job on such wonderful units such as the Gradiente M-166. It is a classic ! Your time was surely well spent as it is important to threat these jewels with care. Now the amplifier will give you many more years of pleasure.
VU looks nice !
Again, congratulations !
João Pedro
Olá Carlos, Como está ?
How are you doing, friend ? Assembling many amplifiers ?? Still looking for the LAB Schematics ?
Abraços,
João Pedro
binary said:
Julio, nice work !
It is very nice to do a restoration job on such wonderful units such as the Gradiente M-166. It is a classic ! Your time was surely well spent as it is important to threat these jewels with care. Now the amplifier will give you many more years of pleasure.
VU looks nice !
Again, congratulations !
João Pedro
destroyer X said:
Olá Carlos, Como está ?
How are you doing, friend ? Assembling many amplifiers ?? Still looking for the LAB Schematics ?
Abraços,
João Pedro
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