Do you know the reason why so big voltage to the input circuit?

destroyer X · 23rd May 2009, 12:23 PM

sometimes if feel those guys had exagerated a little..seems a Sony designer.

ahahahahah!

regards,

Carlos

destroyer X · 23rd May 2009, 12:35 PM

amplifiers..some modification or another idea about... those TAN series of pulse width modulation supply and legato linear circuitry.

This is more modern than the Legato.... seems Sony...or Sony style.

I am studying some schematics and found this one as i had listened the Sony TAN88, down the eigthies (1981) into the Studio i have worked.

I found it mufled compared to others those early days... even together Sony SG7 speaker that was made matched to that amplifier.

regards,

Carlos

destroyer X · 23rd May 2009, 04:36 PM

yep...it is really too much volts there.

Me too... i do not know...reason why asking you.

regards,

Carlos

janneman · 23rd May 2009, 05:32 PM

Carlos, this schematic is not from the TA-N88, I guess you know that.
The high voltage is a trick that was often used at the time by Japanese manufacturers to get the input stages to operate linearly. The signal excursions are now a much smaller proportion of the total available voltage swing. If you look at the load line, there is only a relatively small excursion and over that smaller excursion, the line is more linear.
They sometimes also did it in preamps. I have a Sony preamp that has the phono preamp running at +/-50V...

Jan Didden

Mooly · 23rd May 2009, 05:38 PM

I used to have a Pioneer A80 circa 1985 ish. That ran the phono stage on something like -/+ 60volts. Even madder it was class G, the "low" voltage rails to the output were again around -/+ 60 ish switching to -/+ 75 or so.
But I've learnt a lot since then

destroyer X · 23rd May 2009, 06:19 PM

crazy thing that.

regards Mooly.... i will not eat cow meat today... relax!

Carlos

destroyer X · 23rd May 2009, 06:20 PM

So it is not a Sony.

I am glad to know that.

thank you,

regards,

Carlos

.................................................. ................................................

Music from the eigthies boys!

http://www.tropicalglen.com/Jukebox/.../myjukebox.swf

23rd May 2009, 04:36 PM	#3
destroyer X diyAudio Member Join Date: Feb 2004 Location: Recife - Brasil Northeast	No one knows? yep...it is really too much volts there. Me too... i do not know...reason why asking you. regards, Carlos __________________ Try to build an amplifier folks ... it is pure adrenaline!

23rd May 2009, 05:32 PM	#4
janneman diyAudio Member Join Date: May 2002 Location: Where Germany, The Netherlands and Belgium meet Blog Entries: 6	Carlos, this schematic is not from the TA-N88, I guess you know that. The high voltage is a trick that was often used at the time by Japanese manufacturers to get the input stages to operate linearly. The signal excursions are now a much smaller proportion of the total available voltage swing. If you look at the load line, there is only a relatively small excursion and over that smaller excursion, the line is more linear. They sometimes also did it in preamps. I have a Sony preamp that has the phono preamp running at +/-50V... Jan Didden __________________ /Another new issue: Linear Audio Volume 3!

23rd May 2009, 06:19 PM	#6
destroyer X diyAudio Member Join Date: Feb 2004 Location: Recife - Brasil Northeast	Yep..but this one has high voltage to the input circuit....not to the power stages crazy thing that. regards Mooly.... i will not eat cow meat today... relax! Carlos __________________ Try to build an amplifier folks ... it is pure adrenaline!

23rd May 2009, 06:20 PM	#7
destroyer X diyAudio Member Join Date: Feb 2004 Location: Recife - Brasil Northeast	Thank you Jan Didden. So it is not a Sony. I am glad to know that. thank you, regards, Carlos .................................................. ................................................ Music from the eigthies boys! http://www.tropicalglen.com/Jukebox/.../myjukebox.swf __________________ Try to build an amplifier folks ... it is pure adrenaline!

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23rd May 2009, 05:38 PM	#5
Mooly diyAudio Member Join Date: Sep 2007	I used to have a Pioneer A80 circa 1985 ish. That ran the phono stage on something like -/+ 60volts. Even madder it was class G, the "low" voltage rails to the output were again around -/+ 60 ish switching to -/+ 75 or so. But I've learnt a lot since then

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