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I have decided to swap the opamps on my Onkyo six disc, which uses two
paris of
JRC 4560D.
What are good substitutions, preferrably from Burr Brown or Analog
Devices? -
Reinhart
Hey! How's it been going on the LaserDisc newsgroup?My favorite has always been the Burr-Brown OPA-2604 for Audio applications.
Kurtis
My favorite has always been the Burr-Brown OPA-2604 for Audio applications.
Kurtis
Hey! How's it been going on the LaserDisc newsgroup?
BTW, know where I can get the BB OPA-2604? I was also looking at the Analog
Devices AD826. - Reinhart
Cool. Either that, or request samples from Texas Instruments (which mergedI prefer the B-B OPA2134PA over the OPA2604. Sounds better to my ears & a
lot cheaper. Also
love the Analog Devices OP275GP(source- Newark Electronics).
I prefer the B-B OPA2134PA over the OPA2604. Sounds better to my ears &
a
lot cheaper. Also
love the Analog Devices OP275GP(source- Newark Electronics).
Cool. Either that, or request samples from Texas Instruments (which
merged
with Burr-Brown). I just placed an order for four BB opamps as samples,
which
will be shipped to me at TI's expense. Of course, the stipulation is that
I
don't resell the chips but I don't think I will be reselling the ones I
get.
Definitely will consider them if TI doesn't ship the samples I requested. -Digiket sells the 2604's for around $2.50 each. They're a great deal for
the dollar.
Heh sounds like a review in an audiophool magazine. I don't doubt that theWell, Analog Devices beat Texas Instruments in getting the samples to me.
While TI's Burr-Brown division has already shipped the samples (4 OPA2604
and 4
OPA2134) via UPS Ground and aren't expected to arrive until the 27th,
Analog
Devices responded to my sample request by shipping 4 AD826AN opamps via
UPS
Next Day Air! They got here today and I just installed them.
I hope it's not the placebo effect, but I think I can hear a lot of
details in
the sound much better than now than ever before with 4 of those Japan
Radio
4560D opamps. The high frequencies are smooth while the rest of the
ranges
remain well controlled, the sound quality is more "airy" and dynamic with
a
close 3D quality to it, and certain details, like fingers plucking on a
harp or
bass strings, are more perceptible. Well, I hope a friend of mine who
doesn't
know what I've done will tell me for sure if it sounds smooth and good.
That's a given. And, as I said before, even though I find the result moreHeh sounds like a review in an audiophool magazine. I don't doubt that the
new parts are of higher quality than the ones they replace though.
Well, I take back my praise after an extended listen.
While more accurate and clear than before, the highs and mids are too
aggressive and fatigue sets in after a few minutes. Back to the drawing board,
I guess.
To those who think that the reason for the fatigue is because it's digital, you
must remember that most CD players are designed with rather substandard
analogue sections. There are CD players using excellent designs that actually
sound soothing and emotional but without losing the accuracy at the same time.
- Reinhart
True. Sometimes, faster makes the sound too much "in your face!" I hope II'd say that you'll most probably like the sound of the OPA2134 better, then.
It's sweeter on
top & richer in the mids & lows. In audio, faster very often does not mean
better sound.
Say, that's a good idea. If I'm not mistaken, would that help in dropping theI would also very much recommend installing soft recovery rectifier diodes in
the power supply
for the d/a & output stages.
I'd say that you'll most probably like the sound of the OPA2134 better, then.
It's sweeter on
top & richer in the mids & lows. In audio, faster very often does not mean
better sound.
True. Sometimes, faster makes the sound too much "in your face!" I hope I
made an accurate analogy.
I would also very much recommend installing soft recovery rectifier diodes in
the power supply
for the d/a & output stages.
Say, that's a good idea. If I'm not mistaken, would that help in dropping the
noise floor? Which brings up something else kind of cool about the Onkyo. It
looks as if it has two bridge rectifier sections, each with four rectifier
diodes and their own filtering capacitors. Perhaps a separated power supply
under one transformer, with one section that supplies power to the SYSCON and
mechanical functions while another powers the digital and analogue sections.
And another fascinating fact. A lot of major parts in the Onkyo were from
Sony! The SYSCON processor, the D/A LSI (which was branded Onkyo but the part
numbers are Sony), and even the entire disc drive traverse chassis which I've
also seen used in a Sony ES 5 disc changer, a Pioneer shelf-system, an Aiwa
shelf-system, and even a Sega CD expansion for the Sega Genesis video game
system! - Reinhart
Must be pretty amusing when you have someone badmouth a Sony CD player, butMost Onkyo changers are 90 percent Sony, as are many of their single players.