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In Reply to: RE: VINTAGE SONY AMP MOD LAB. posted by rockanroller on August 03, 2016 at 18:05:12
The Sony ES use very good caps are DC coupled in the critical areas so there nothing you are going to mod in the amps by nature of design..You may be able to upgrade some caps,but Sony was very meticulous in choosing very good caps for the Espirit series amps and preamps and all you will end up doing is making things worse if you go in and try to alternate bias points..
What a lot of so called mods consist of is a capacitor or diode change. I redid s Plinus amp 2 years ago where the guy sent to some place in New York and 1200 dollars later the amp sounded like it was out of phase and had a hump in the bass at 35 cycles..All I did was put it back to original and the guy was never so happy. They had these little perforated boards hanging off the B+ rail and one by every push pull pair of output transistors.They had like 6 parts on each and when I called the guy who did the supposed mod,he claimed it was a mod they no longer do because they found a better one with fewer issues.It supposedly added better regulation to the B+ supply but the amp already has superb regulation.There are a lot of people out there pulling this kind of shenanigans so beware.
"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken
Edits: 08/07/16Follow Ups:
Michael
Thank you for that answer of wisdom and truth. Since you have a wealth of knowledge ,
and I am starting in the hobby, the question is: would you change the capacitors, since the amp is fairly old, and those might need to be changed? If so, what capacitors would you recommend? Or would you leave it alone and look at upgrading amplifier?Thoughts?
Thank you kindly.
Nichicon also has a gold series and Philips has the BC series which I really like.The caps I would change would be the main power supply input filter caps..There,you would be a little more creative and use a more exotic type cap there as well as in the power supply sources.These amps already use Schottky diodes but I need to look at the schematic again to see what are the best caps to use and where.
"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken
Mike what do you think about these in the signal positions.
I've been using these on my SS amps in signal path positions. Wonderful clean clear sound. None of the old lytic sound we all knew and hated. Very natural sounding.
I love those caps..I use them as cathode bypass and as couplers in SS amps.
"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken
20 or so year old power supply electrolytic caps. are legitimate candidates for replacement. Panasonic and Nichicon are go to brands for those kind of parts. Look for combined low ESR and 105 o C. specifications. A high ripple current rating is good too.
Don't buy off "EBone". Get the genuine article from Mouser.
Eli D.
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