Jim Audiomisc
pfm Member
Why mess with the 909?
Because to my ears the 909 is overly smooth and bland sounding, mellow and boring. I purchased this amp while i was a student several years ago because at the time it was all i could afford.
What the 909 does have going for it however is raw power on tap. I have done extensive research regarding 909 mods and with some basic upgrades it can be made to sound noticeably better.
Critisism of this amp often involves lack of treble ect, and MANY people have mentioned replacing C7, C9 C11 can make a BIG difference here. Using high quality caps from quality bands such as Nichicon ect.
The reality is Quad used many cheap components inside this amp, and replacing some of these parts with better quality types can make the amp much better.
Don't tell me "if you don't like Quad go and buy something else ect". Why would i want to spend crazy amounts of money for a Cyrus or Naim when for a the cost of a few capacitors i can be very satisfied with my Quad?
And please don't tell me that a Quad is a Quad and that it will never be a Cyrus or a Naim ect, because i'm not expecting it to be.
What i am expecting is to make it sound better than it currently does and based on my EXTENSIVE research i think that is realistic.
I am in this hobby for best results at affordable costs.
Good luck. You'll have to follow the advice of the "many people" who have told you what you now believe. I can't help you if you've already made up your mind about that. Personally, I tend to be cautious of "extensive research" of the *opinions* of others which you may have no way to judge the reliability of if you have no real experience of even basic electronics - let alone amplifier design.
Your intended aim is fine. But the result may be a lot of wasted time and effort, I'm afraid. However I hope you succeed. Experiment can be a good way to learn. But it can also be costly if you may mistakes with consequences. Goes with the territory.
Personally, if an amp works well but the results sound 'boring' I'd be more inclined to change the music, speakers, or room as experience shows those factors often make a very noticable difference. As does the simple change of adding, say, a 1 Ohm resistor in series with each speaker in many cases. But its your time and money.
Note, though, that changes inside a loop may cause problems like instability, etc. So you risk making things worse. Indeed, if unlucky you may do damage to the amp.