TVI, uploading to Mikeks, please, include my name too
nanabrother@yahoo.com
Thanks in advance by your kindness,
regards,
Carlos
nanabrother@yahoo.com
Thanks in advance by your kindness,
regards,
Carlos
Hi CARLOS , MIKEKS and all diyAudio members.
I have uploaded the service manual of this power amplifier on
http://fileshare.eshop.bg/
click and search for n55es.
All people can download the S.M. for free.(DOWNLOAD ALL THE TWO PARTS ,file is .rar)
I know this power amplifier because I had repaired two times two differents models.
It was considered a good amp on the Sony ES series,but I'm not sure.
A Sanyo power pack is the voltage amp,the N-55ES has some stability problems,it is not able to drive a loudspeaker less than 4.5 Ohms,the distortion,very good at low frequencyes ,will increase from 2 KHz.This amp has a very high amount of NFB...
I have uploaded the service manual of this power amplifier on
http://fileshare.eshop.bg/
click and search for n55es.
All people can download the S.M. for free.(DOWNLOAD ALL THE TWO PARTS ,file is .rar)
I know this power amplifier because I had repaired two times two differents models.
It was considered a good amp on the Sony ES series,but I'm not sure.
A Sanyo power pack is the voltage amp,the N-55ES has some stability problems,it is not able to drive a loudspeaker less than 4.5 Ohms,the distortion,very good at low frequencyes ,will increase from 2 KHz.This amp has a very high amount of NFB...
Hi
you guys have a lot of commercial amp diagrams
can you email them to me
file formats: webgraphics etc,pdf
thanks
john
you guys have a lot of commercial amp diagrams
can you email them to me
file formats: webgraphics etc,pdf
thanks
john
Hi, Mikeks,
There's something I don't understand about this Sony TA-N55ES schematic.
Look at "inside" of IC301 (STK3102III). At the VAS. It is cascoded, but if it is a cascode, shouldn't the cascode transistor is PNP?
In the schematic, it is NPN, it is static voltage in pin10, how can it get audio swing voltage?
There's something I don't understand about this Sony TA-N55ES schematic.
Look at "inside" of IC301 (STK3102III). At the VAS. It is cascoded, but if it is a cascode, shouldn't the cascode transistor is PNP?
In the schematic, it is NPN, it is static voltage in pin10, how can it get audio swing voltage?
hey George (aka johndiy 😀),
There is a link in parsecaudio post that has the manual. You will need software than handle .rar files.
regards
There is a link in parsecaudio post that has the manual. You will need software than handle .rar files.
regards
I missed out...
the link died. I would like to see this schematic too, if possible?
Cheers,
Shawn.
shawn@raindogindustrialarts.com
the link died. I would like to see this schematic too, if possible?
Cheers,
Shawn.
shawn@raindogindustrialarts.com
This works:
http://fileshare.eshop.bg/downloadsm/23449/SONY_TA-N55ES.html
And so does this:
http://eserviceinfo.com/downloadsm/23449/SONY_TA-N55ES.html
http://fileshare.eshop.bg/downloadsm/23449/SONY_TA-N55ES.html
And so does this:
http://eserviceinfo.com/downloadsm/23449/SONY_TA-N55ES.html
Thank you TVI and Parsecaudio...now i have the schematic...Johndiy
Johndiy....i use to download many schematics at
www.schematicforfree.com
It works for free and not for free too (better with payment naturally)
There are also our forum friends sites, where you can download a lot of good schematics.... as a good example:
www.audio-circuit.dk
this one that you could find using the link provided by Parsecaudio is one of the best ones...and this is really for free.
One more option, the one i use constantly, is to type in Google search:
Audio amplifier schematics
And following each link you will have thousands of schematics, many of them repeated in some home pages.
By the way...is really John your name?...ahahahaha!
regards,
Carlos😀
Johndiy....i use to download many schematics at
www.schematicforfree.com
It works for free and not for free too (better with payment naturally)
There are also our forum friends sites, where you can download a lot of good schematics.... as a good example:
www.audio-circuit.dk
this one that you could find using the link provided by Parsecaudio is one of the best ones...and this is really for free.
One more option, the one i use constantly, is to type in Google search:
Audio amplifier schematics
And following each link you will have thousands of schematics, many of them repeated in some home pages.
By the way...is really John your name?...ahahahaha!
regards,
Carlos😀
ACD said:
Jan,
When I tried to download the file on your site it seems to be broken eg not all pages visible.
I have downloaded and extracted the rar file(s) myself now and that pdf file is just fine.
CASCODE AND CURRENT MIRROR
Hello lumanauw
in the first stage of STK the PNP transistors are not a cascode but a current mirror circuit,in order to make a balancing voltage across the input differential.
In the second stage you are right:there is an error in the original Sony schematic,but NOT in the STK datasheets:the two transistor of the cascode must to be a PNP type.
Look at the datasheet (the internal circuit are the same for all the 31xx mk3 Sanyo STK series)
Hello lumanauw
in the first stage of STK the PNP transistors are not a cascode but a current mirror circuit,in order to make a balancing voltage across the input differential.
In the second stage you are right:there is an error in the original Sony schematic,but NOT in the STK datasheets:the two transistor of the cascode must to be a PNP type.
Look at the datasheet (the internal circuit are the same for all the 31xx mk3 Sanyo STK series)
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