Yeah... Ruth is stranger than Richard ! :lolsign:Quote:
Originally Posted by Covenant
Printable View
Yeah... Ruth is stranger than Richard ! :lolsign:Quote:
Originally Posted by Covenant
I have a strong feeling that you won't like the 4562 in the line and the 2132 in the HPA. How do I know? I tried it:) In that setup the LM4562 has bass but the mids and highs, while present and accounted for, just don't inspire. It's all there but so what?Quote:
Originally Posted by Covenant
Gazjam's recommendation of OPA2132 in the line out and nothing in the HA really improved things for me. That sweet mid to high became a wee bit brighter.....just what I needed.
Again the OPA2132 has seduce me into "sitting down and enjoying the music."
My system is so close ...I still have a small urge for a little more Oomph in the bottom end.
My dilemna now is that I could get that Oomph back if I re-configure my system such that I use the pre-amp in my Yamaha integrated rather than using the TC-7520 as my pre-amp. What stops me from doing that is that when the 7520 is my pre-amp, the music is so much more alive. It's like, wow, so THAT's what my mid-range and tweeter can do. Unfortunately with that setup the bass or bottom end takes a very small step backward.
Decisions, decisions:confused:
CD
Anyone done any reading, or indeed tried out any of the projects from the 'lampizator' website? (www.lampizator.eu).
I'd been reading this page in particular:http://www.lampizator.eu/LAMPIZATOR/...ishizator.html
Especially the bit about building a single transistor based output stage into an 8-pin op-amp socket. It all sounds thoroughly intriguing. Unfortunately, I'm away for the weekend, so it will have to wait, but I'm thinking about this as a little project over the next couple of weeks.
On a separate note and having spent the train journey from Swindon to Cardiff this morning reading his amazing website, I was reading the bits on repairing CD players and improving the sound from budget players, so when I got home, to my delight, my parents old Yamaha (actually my old Yamaha) CD player of almost 20 years had been dug out for use but was skipping. An hour later with my new knowledge I not only had it playing faultlessly again but sounding a load better too after snipping out the caps in the output stage. I'm quite chuffed!
There's a chap on the Wigwam selling a pair or THS4032 op amps for free plus postage.
http://www.hifiwigwam.com/view_topic...jump_to=728282
Scroll down to the post by HectorHughMunro (#693)
I did the MLC mod a while back (which was a huge improvement), and have been trying different opamps again (mainly LM4562 and AD826) to see if they offered anything over the dual OPA2107 setup I was using. When I put both 4562's in I noticed they seemed to be a bit more precise with deep bass but a little timid at times, and after a while I couldn't stand the bad headphone driving capability so switched to AD826 on the headphone side. The 826 drives my Grado's possibly a little aggressive but works well.
I noticed though that the sound on the line out using the 4562 seemed to to working quite well, although I had been fiddling with speaker cables which may have biased the result slightly. Anyway recently I put a 2107 back in the headphone socket and I swear the line out doesn't sound as vibrant with this setup. It could well be ear and mood bias so intend to switch the AD826 back into the headphone socket to see if things improve.
Lovejoy,
Some DAC makers seem to swear by a transistor output stage. I'd be very curious of the effect of this transistor op-amp replacement suggested on the Fet-ishizator page you linked to. Do I have the balls and skills to do this at present? No. But I find the idea very interesting...
I've just finished up putting the 100nf cap + 36k mod into a 'caimanised' 7520. I was using the 10pf caps before, whoops.
Initial impressions, the occasional breakup I was getting with the K701s has cleared up mostly.
Bass is firm and well presented. The very very top end is ever so slightly recessed (Triangles at the back of the auditorium kind of thing) but I feel these were slightly too prominent before.
The roar of guitars and full weight of instruments is back, without being overly fat or round sounding.
Overall, a worthwhile mod. The only thing I'm waiting for now is the Caiman PSU and I have a feeling that will be it... Maybe ;)
ive got a LM4562na chip will it do the same job as a LM4562an?? also whats the difference between them? thanks
also is there a step by step with pictures on how to do the op amp replacment? and anything else u need to install at the same time? cheers
Dunno about no LM4562na. There is a LM4562HA, looks a little something like thisQuote:
Originally Posted by boomtheroom
http://t0.gstatic.com/images?q=tbn:Z...A%255ENOPB.JPG
And then there's the LM4562NA, that looks like this
http://www.audioupgrades.co.uk/images/lm4562na.jpg
Basically, they do the same thing, there are divided opinions as to which one's better, but with the NA there's less hassle changing them.
What you have to do is take the cover out, spot the opamps (which are at the top somewhere around the area where the headphones out socket is). Gingerly take the opamp out and stick the replacement in, just as gently, without bending its legs. There's quite a few pics around in this thread, check pages 35-40, I think that's where you can find some of them, as well as explanations.
The little round indentation marks pin no.1 and should be top right corner as you look at the front of the DAC.