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The Opamp thread - Page 252

post #3766 of 4812
Quote:
Originally Posted by Mad Max View Post
If from Audio Jade on eBay, they are honest and call the chips used.  The listing says new, but they specify that the adapters are what's new, lol.

ADA4610 is bad ass.  Deep sound stage with razor-sharp imaging, lively sound, incredibly clean, very clear and full treble.  Note attack is rather sharp, just shy of being a bit too much for my tastes but lends itself well to percussion instruments.  Very neutral and mercilessly revealing, just the way I prefer.  =]

Why did you have to mention ADA4610, now I have to make another impulse buy.

It looks like the ADA4610 do not come in DIP-8, so time to try my hand at soldering.

Anyway, I did order from Audio Jade.
 

 

 

post #3767 of 4812
Quote:
Originally Posted by qusp View Post

I didn't look at the ad, you didn't mention used so makes more sense. but you are mistaken applying logic to electronics pirates. some of the parts you see faked you wonder how there could be any money in it; often with used parts too, so they can pass them off as NOS more easily. Japanese Toshiba power transistors and jfets, rare mosfets, Dac chips and yes opamps.

The seller (Audio Jade) uses the name "audjade_chn" on eBay.

I figured most electronics pirates would use the word "new", just so they can charge more money.

My idea is not perfect, but i think it's one way to try and filter out the E pirates.
 

 

 


Edited by PurpleAngel - 3/20/12 at 1:10pm
post #3768 of 4812

I have bought from them many times and never had any issue, even with what could be considered boutique opamps.

 

The ADA4610 is incredible :) I have 2 off bypassed in my PB-2 and am listening as I write via DB-2 + PB-2 + Clas combo and Balanced AH-D7000's. Oh my, I have work in the morning but I don't want to go to bed.....

 

Thanks Max for your help on bypassing, I think I am finally getting it. I have had amazing results with OPA827, ADA4610 and OPA1662 opamps, far more success than the Class A resistor tweak which is a bit hit and miss. So thanks for the leg up the bypassing ladder, the cheque's in the mail.

post #3769 of 4812
Quote:
Originally Posted by Mad Max View Post

If from Audio Jade on eBay, they are honest and call the chips used.  The listing says new, but they specify that the adapters are what's new, lol.

 


ADA4610 is badass.  Deep soundstage with razor-sharp imaging, lively sound, incredibly clean, very clear and full treble.  Note attack is rather sharp, just shy of being a bit too much for my tastes but lends itself well to percussion instruments.  Very neutral and mercilessly revealing, just the way I prefer.  =]


Hi Mad Max,

 

how do the ada4610 compared to the ada4627-1 brz????

 

Regards

 

ecohifi
 

 

post #3770 of 4812

4610-2B seems to achieve a tighter, more focused and weightier sound versus 4627-1B.  Slightly more prominent treble than 4627 and deeper bass with K701.  Less soundstage depth than 4627.  They otherwise sound the same.  4610 seems to be very easy to stabilize, unlike 4627 which is a PITA.


Edited by Mad Max - 3/26/12 at 10:27pm
post #3771 of 4812

Mad Max,

 

many thnxs for the reply,

 

ordered a pair of ADA 4610-2brz and AD8599 ARZ as samples thru the ADI web site, unfortunately you can only order 2 of the same item per order as samples, they should be arriving tommorrow according to there delivery instructions.

 

I have a soft spot for the ADI devices. 

 

The ADA 4627-1 Brz have a better psu CMRR and lower noise levels than the A version and are better sounding,

 

The AD 4610-2brz are probably easier to tame than the 4627 due to a reduction in slew rate and non voltage reversal when over driven.

post #3772 of 4812

Max, are you having any issues when switching off your amps with the ADA4610's? Everything I've tried them in makes a terrible short screeching noise when switching off. I am having to pull my IEM's out first for fear of damaging them.

 

(Fi-Quest / Ibasso P4 + PB2)

post #3773 of 4812

You dun goof'd somewhere!  o__O'

 

Or so I reckon.  If you added a cap like I did, it connects across pins 4 & 8 only, right?


Edited by Mad Max - 3/27/12 at 10:06am
post #3774 of 4812

Yeah, pins 4 and 8 only and all 4 off them are the same. They were the same before bypassing so I don't recon I dun goof'd.... Might be ibasso kit, you got any to try?

post #3775 of 4812

What do you mean "ibasso kit"?

I don't have anything iBasso except for their adapters.  And I have both of my 4610-2B samples mounted on iBasso adapters.

 

DSCN0281.JPG

post #3776 of 4812

I just mean iBasso amps (Fi-Q / P4 / PB2). I tried the 4610 in my EF-5 tonight and there was no noise when switching the amp off. Just so you know the 4610 doesn't shine in the EF-5 but is fantastic in my other stuff apart from the annoying screech when switching off, guess I'll have to live with it.

post #3777 of 4812

I've just started op amp rolling with my Essence One and was hoping for some advice from people with experience rolling on the One.

 

I currently have 1x http://www.ebay.co.uk/itm/LME49720HA-LME49720-TO99-DIP8-/190653873559?pt=LH_DefaultDomain_0&hash=item2c63db3d97#ht_1001wt_1270 in the RCA Buffer and

2x http://www.ebay.co.uk/itm/DUAL-SOIC-LME49990-DIP8-ADAPTER-/190641930863?pt=LH_DefaultDomain_0&hash=item2c6325026f#ht_709wt_1270 in the low pass filter

 

I'm finding more details than the stock op amps and an improved soundstage, but I'm finding trebles to be a little bright. I'm noticing high hats more often now.

 

I feel like the sound currently needs slightly more bass to balance the treble out and slightly more attack wouldn't go amiss too.

 

I was going to order a full set of 49990s to try, but I've heard that the LME4x chips can sound a little bright and now I'm experiencing some of this brightness I'm having second thoughts.

 

I don't want to be soldering, so if anyone could also advise reputable ebay sellers of compatible chips(Already built to drop into my One) it would be greatly appreciated!

post #3778 of 4812
Quote:
Originally Posted by Mutsu View Post
I've just started op amp rolling with my Essence One and was hoping for some advice from people with experience rolling on the One.

I currently have 1x http://www.ebay.co.uk/itm/LME49720HA-LME49720-TO99-DIP8-/190653873559?pt=LH_DefaultDomain_0&hash=item2c63db3d97#ht_1001wt_1270 in the RCA Buffer and

2x http://www.ebay.co.uk/itm/DUAL-SOIC-LME49990-DIP8-ADAPTER-/190641930863?pt=LH_DefaultDomain_0&hash=item2c6325026f#ht_709wt_1270 in the low pass filter

I'm finding more details than the stock op amps and an improved soundstage, but I'm finding trebles to be a little bright. I'm noticing high hats more often now.

I feel like the sound currently needs slightly more bass to balance the treble out and slightly more attack wouldn't go amiss too.

I was going to order a full set of 49990s to try, but I've heard that the LME4x chips can sound a little bright and now I'm experiencing some of this brightness I'm having second thoughts.

I don't want to be soldering, so if anyone could also advise reputable ebay sellers of compatible chips(Already built to drop into my One) it would be greatly appreciated!

I was able to get 20 pieces of AD797BRs pre-soldered to 10 adapters (dual SOIC to DIP-8) for $80, off eBay, shipped from China.

The seller is Audio Jade, listed on eBay as audjade_chn.

I've only tried 3 of the tens pieces, on my Essence STX, they sound good and work fine.

Some have said the AD797 are not the most stable op-amps, but they work fine on my Essence STX.
 

 

 

post #3779 of 4812

LM4562 as replacement of MC33078

Can you think of a reason why an amp Beyerdynamic A1 or its exact clone works 100% fine with its stock 2x MC33078 but when refitted with 2x LM4562 it SOMETIMES does not work at all (does not switch on), no sound,the leds before LM4562s are on but the led after them is off and no sound, it fixes when I switch off and back on a few times, with original MC33078s there's no such a glitch. I guess it might be myriads of reasons in opamps and pcb of the amp but maybe you can see something straight from the specs of both opamps below.

  

IC, OP AMP, DUAL AUDIO, MC33078, DIP8
  • Op Amp Type:Low Noise
  • No. of Amplifiers:2
  • Bandwidth:16MHz
  • Slew Rate:7V/µs
  • Supply Voltage Range: ± 2.5V to ± 15V
  • Amplifier Case Style:DIP
  • No. of Pins:8
  • Operating Temperature Range:-40_C to +105_C
  • SVHC:No SVHC (20-Jun-2011)
  • Amplifier Type:Audio
  • Base Number:33078
  • Gain Bandwidth:9MHz
  • IC Generic Number:33078
  • Input Offset Voltage Max:3mV
  • Logic Function Number:33078
  • Operating Temperature Max:105_C
  • Operating Temperature Min:-40_C
  • Package / Case:DIP
  • Slew Rate:7V/µs
  • Supply Voltage + Nom:15V
  • Supply Voltage Max:15V
  • Supply Voltage Min: 2.5V
  • Termination Type:Through Hole

 

OP AMP AUDIO DUAL LM4562 HF 8-DIP, POWERWISE

  • Amplifier Class:AB
  • No. of Channels:2
  • Supply Voltage Range:± 2.5V to ± 17V
  • THD + N:0.00003% @ 2kohm, VS=± 15V
  • Load Impedance:2kohm
  • Operating Temperature Range:-40_C to +85_C
  • Amplifier Case Style:DIP
  • No. of Pins:8
  • SVHC:No SVHC (20-Jun-2011)
  • Base Number:4562
  • Gain Bandwidth:55MHz
  • No. of Amplifiers:2
  • Op Amp Type:Low Noise
  • Output Power Pout:-000mW
  • Package / Case:DIP
  • Slew Rate:20V/µs
  • Supply Voltage Max:17V
  • Supply Voltage Min:2.5V
  • Termination Type:Through Hole
     

Edited by sssboa - 3/29/12 at 2:29pm
post #3780 of 4812
Quote:
Originally Posted by Mutsu View Post

I've just started op amp rolling with my Essence One and was hoping for some advice from people with experience rolling on the One.

 

I currently have 1x http://www.ebay.co.uk/itm/LME49720HA-LME49720-TO99-DIP8-/190653873559?pt=LH_DefaultDomain_0&hash=item2c63db3d97#ht_1001wt_1270 in the RCA Buffer and

2x http://www.ebay.co.uk/itm/DUAL-SOIC-LME49990-DIP8-ADAPTER-/190641930863?pt=LH_DefaultDomain_0&hash=item2c6325026f#ht_709wt_1270 in the low pass filter

 

I'm finding more details than the stock op amps and an improved soundstage, but I'm finding trebles to be a little bright. I'm noticing high hats more often now.

 

I feel like the sound currently needs slightly more bass to balance the treble out and slightly more attack wouldn't go amiss too.

 

I was going to order a full set of 49990s to try, but I've heard that the LME4x chips can sound a little bright and now I'm experiencing some of this brightness I'm having second thoughts.

 

I don't want to be soldering, so if anyone could also advise reputable ebay sellers of compatible chips(Already built to drop into my One) it would be greatly appreciated!

 

The LME brightness is probably due to instability, in my experince. LME49990 is badass.  Another great opamp that you can try and that is not too finicky is OPA602BP.  I would try BUF634P in buffer positions.  These last two chips do not require soldering and are single opamps.

 

If all else fails for you, then you probably can't go wrong with "an army of AD797" purchased from Audio Jade (audjade_chn) on eBay as leeperry prescribes, lol.

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