I guess the cutting down process should be relatively straight forward with some wire cutters etc so you can get them into the case of the 7520?
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I guess the cutting down process should be relatively straight forward with some wire cutters etc so you can get them into the case of the 7520?
Have a look here:Quote:
Originally Posted by rhmjmango
http://shop.ebay.co.uk/merchant/yp53
You should be on commission Trailer, just ordered a pair of 49720's for £12.49 shipped and have asked the seller to trim them down for me as he says he will do in the ad:)
I wish!Quote:
Originally Posted by mwahahaha
You ordered the metal HA version right? Then the price is not right for a pair of these opamps. Am i right!:scratch:Quote:
Originally Posted by mwahahaha
Aye that's right. That's the price for one.Quote:
Originally Posted by rhmjmango
I know, i ordered one. What confuses me is their advice.Quote:
Originally Posted by trailer
*We recommend using Black Gate (or similar) capacitors on the power rails for these opamps.
Who can comment on this recommendation?
Sorry yes I meant I bought them for £12.49 each - worded that one very badly:doh:Quote:
Originally Posted by rhmjmango
The story so far:
I have replaced one of the THS4032's with a spare and all seems to be OK at the moment. I have not (as yet) fitted a decoupling cap - I'll see how it goes after a burn-in. Perhaps the chips are very picky and i've just fitted a good 'un.
I really do like the sound of there opamps with the K701's - They do very little wrong - Everything is there and in full control - Superb!
Ken
Trailer, which op-amp is for the headphone, left or right one i the picture?Quote:
Originally Posted by trailer
The right one.
STan
Well, the replacement THS4032 has been running for a good few hours now and there's no sign of the previous "crackling" problem. I think if the problem still existed it would have shown itself by now.
I say it again - This is a superb opamp - It works really well with the K701's and the sound is just to my liking, plenty detail, punchy and a huge soundstage.
The moral is: If you want to try the THS4032, get one or two spares just in case of problems with stability.
BTW guys - What headphones are using with your opamp experiments?
Cheers - Ken
Alessandro's MS1 modified to MS1000
too much heat when soldering SMD op-amps can cause some internal damage.
It does not take a lot for those tiny legs to heat up
Thats true Leo - It's likely to have been when I was soldering the decoupling cap - I did get a blob on one of the legs which needed cleaning off...Quote:
Originally Posted by leo
So, with a bit of luck, it may not be necessary to add the cap which makes the whole exercise more appealing!Quote:
Originally Posted by sponge
OK, I am warming up :lolsign:
What is difference between 7510 and 7520 models?
For op-amp rolling check link bellow. I agree 110% with this.
http://www.head-fi.org/forums/f5/lit...olling-304261/
Sign-up at www.linear.com and ask for some free samples :eyebrows:
LT1364 is good choice, way better than LM4562.
I think it's a "suck it and see" thing. It's no problem to try it without the caps and fit them if needed - Just be warned that too much heat can cause trouble. As I said, the problem I had was probably due to spending too much time cleaning up a solder blob when I was fitting a cap.Quote:
Originally Posted by Covenant
Definitely - Stan what are your feelings on the additional cap?Quote:
Originally Posted by Covenant
I take it without the cap the overheating risk is higher?
This is fascinating....
So we have a new kid on the block, the LT1364.
One of the mods or Stan should tell us if its suitable-some details:
GBP 70MHz
Slew-Rate 1000V/μs
Supply Voltage ±2.5 → ±15V
Package SOIC8
CMRR 76dB
Function Unity-gain stable, voltage-feedback
Operating Temperature Range -40 → +85°C
Settling time ns to % 50 → 0.1
V Offset mV 1.5
Avilable from RS for about £5 each.
It's a must.Quote:
Originally Posted by mwahahaha
The THS4032 has a V offset of 0.5mV and a CMRR of 100dBQuote:
Originally Posted by Covenant
Thanks Stan, do you fancy adding an accessory to your online store of the opamp, adaptor board and soldered cap?;)Quote:
Originally Posted by Sensimilia
Also how's that power supply getting along - weren't you testing a sample a while back?
I'd be up for that too.Quote:
Originally Posted by mwahahaha
Id be up for the THS4032 / board / cap combo I meant.Quote:
Originally Posted by mwahahaha
So what about this one Stan?
The OPA2111KP available from Farnell at about £15 and looks like it doesnt need the interface which is putting me off a bit:
OP AMP, DUAL, LOW NOISE
Amplifiers, No. of:2
Gain, Bandwidth -3dB:2MHz
Slew Rate:2V/µs
Voltage, Supply Min:10V
Voltage, Supply Max:36V
Case Style:PDIP
Pins, No. of:8
Temperature, Operating Range:-40°C to +85°C
Bandwidth, Gain:2MHz
Base Number:2111
Current, Iqc Max:9mA
Temp, Op. Max:70°C
Temp, Op. Min:0°C
Time, Settling:10µs
Voltage, Input Offset Max:5mV
Voltage, Supply +Nom:18V
Any problem just fitting one?
Have you tried the LME49720 yet?Quote:
Originally Posted by Covenant
Not yet Trailer, the only one I have tried up to now is the 4562 which sounds great in my system. I am tempted to buy one of each as its unlikely I will use headphones much.
It seemed to take a while for the 49720's to run in but I definitely prefer them now to the 4562's.
I've got some 4032's coming in the next day or two so I'll let you know how I get on with them too.
Great-I wish they gave them names rather than numbers-I have to read back on the thread to remember which one is which.
A sticky with a list of them and peoples opinion would be very useful.
You can also compare THS4032 vs. LT1469.Quote:
Originally Posted by Sensimilia
CMRR of 100 dB vs. 112 dB
Or compare PSRR, or....
I am not listening to datasheets, I am only reading datasheets :lol:
But I am listening to music, not datasheets.
I don't like op-amps at all :lol: Not LT, not OPAs, not LM, not.....
Ordered TC-7520 today from you :eyebrows:
Rather give some more details about power supply, PSRR figures and DAC chip used to turn me on and to prepare me on wild orgy with TC-7520 :smoking:
I've ordered both of those LT devices to try in the differential to line out of my Sabre dac
I'll have to keep an eye on the DC offset though because I don't use any coupling caps
I've ordered a pair of LM4562s on ebay after the good reports. I'd also like to test the THS4032s, but can't face learning getting a soldering iron and learning how to solder..
http://stores.shop.ebay.com/Tirna-El...__W0QQ_armrsZ1
This guy will do the soldering for you if you send him down the op-amps.
In that case you gonna hate the TC-7520. It is not a trend follower of component specs. Even your high quality digital music files might sound analogue from a time when vinyl was king, instead of sounding like high quality digital audio files. You might even get to like USB audio, which is not a smart thing to repeat amongst audiophiles with expensive CD players...Quote:
Originally Posted by FireFly
Stan
Stan, don't worry, I don't judge anything just by technical specifications. It is just curiosity.
I have bad habbit to rip apart & exchange parts in my audio gear after few days of listening. And it is very easy to work if schematic is available :)
I have had the TC-7520 for a couple of months now and it sounds superb. Very pleased. Thanks Stanley.
I use it with optical connected to a Panasonic DMR-EX78 DVD/HDD/Freeview recorder for DVD and TV sound and for Freeview radio, and have the USB connected to a laptop system for iTunes (lossless & 256k AAC) plus internet radio, BBC iPlayer youtube etc. All the usual settings on Windows/iTunes/Quicktime etc optimised according to my 'bible' on such matters, Benchmark Media Wiki.
I read with interest about the suggested LM4562NA upgrade and have invested my £7.49 today.
I am not at all skilled with soldering iron but I can cope with slotting two opamps into 8 pin adaptors! (I did the same on an old Firestone Audio Fubar II USB/Supplier set-up with a Burr Brown OPA2107AP and it sounded great afterwards.)
I already love the 'class-A' type sound of the TC7520. Smooth, detailed and spacious and 'forgettable' (in the nicest sense :) of course).
I has been suggested to me (on another hifi forum) that the LM4562NA op-amp upgrade will make the soundstage even bigger and provide more detail. I hope this is not at the expense of what I like about it already. I don't want to start 'hearing' it.
Looking forward to them being being delivered in the next few days.
I have also been advised to give the LM4562NA's up to 100 hours to 'run-in'. I don't normally give any credence to anything non-mechanical having a 'run-in' period so would like to hear from you on this matter. (I am prepared to have my mind changed.)
Oh yes....
Hello everyone. I am new here.
He has done the whole thing for me. Ordered the THS4032CD opamps, supplied the caps and SOIC to DIL boards and soldered it together. Total cost inc p&p = £19.70.Quote:
Originally Posted by trailer
Will let you know how it works out when I get it.
Ade
Excellent. It'll be interesting to hear others findings sound wise with different op-amps.
Personally I dont think much running in is required for op-amps, its capacitors that bed in after a period. Welcome by the way!Quote:
Originally Posted by chebby
The LM4562NA for the 1st IC and the THS4032 for the 2nd seems a good combination on my rig. I might mod my personal unit with a WM8716 and a few minor tweaks I have had in mind but just can't find the time to try out.
Stan
Farnell has a WM8716 on its site but its got 24 pins-not that one surely?
Nope. You need the 28 pin version.
It's a Wolfson DAC - I assume Stan plans to replace IC2 - The PCM1716E. An interesting mod - I for one look forward to Stan's verdict on the swap.Quote:
Originally Posted by Covenant
Also interesting is Stan's suggestion of a LM4562NA in the 1st opamp socket. Just by coincidence, I have a couple on order (I wanted to see what all the fuss was about) - So I'll give it a try.
Ken
I have just ordered one LME49720HA. That should satisfy my op-amp curiosity for a week or so!
The first op amp socket and the second....Quote:
Originally Posted by sponge
Which one does what?
I take it the first (the LM4562 one) is for the main Dac Output and the second is the eq phones one?
I.e best to use Lm4562 for the main Dac output?
I did it on a TC-7510, but the TC-7510 PCB needs a few other mods before it works properly. I have done it on one early TC-7520 but abandoned the use of the WM8716 in the production version for cost reason. It would have added about £10 to the price of the TC-7520 from the factory floor to the end-user.Quote:
Originally Posted by sponge
The one above the headphone socket is the line output opamp. The one above the volume control is the headphone opamp.Quote:
Originally Posted by Gazjam
Experiment and see which opamp combination sounds more pleasant. Since I mentioned the THS4032 a lot of people have tried that.
Is the WM8716 a straight swap (ie no further mods) in the 7520 Stan?Quote:
Originally Posted by Sensimilia
It's a direct replacement. If the U$ had been 2 to the £ it would have been used in the TC-7520.Quote:
Originally Posted by trailer