Review: ZERO 24 BIT/192KHz DAC/Headphone Amp/Pre-Amp - Page 592

You need to put two on a browndog adaptor (see the FAQ in my sig). Some eBay sellers sell them already assembled, either using the SOIC (small ones that have to be soldered) or DIP8 (works in sockets) versions. Just search ebay for "opa627 browndog". Beware though that there are a few fakes out there. "tubebuyer" usually sells the genuine ones, from experience. The Browndog online store sells them too, but they aren't cheap. A HDAM from Audio-gd would probably work out cheaper and sound better.

I'm going to order some sample op-amps to try, specifically the LT1364 + LM4562 combo, and just need to confirm the part numbers since I'm newb at this. I'm guessing you just need to sign up on the website even though you're not with a company or anything?

LT1364 - LT1364CN8#PBF PDIP

Lm4562 - LM4562NA MDIP 8 pin

How many do I need. Also, whilst I'm at it, what other samples should I order?

Both the LT1364 and LM4562 are dual channel opamps, so 3 of each would be enough. The LT1364 gets quite hot in the DAC section of the Zero though, so it's best kept to the headamp section. The LM4562 can be used in either though.

Ordered 2 LT1364 and 5 LM4562. How does that combo sound?

Should be fine. I ordered 5 LM4562 and they only sent me 3 by the way, but it's enough.

Ah, I was actually asking how does that combo of op-amps sound.

Should've phrased the question better. My bad.

Good question........I have a LM4562 that came stock with my Auzen Prelude SC. What I remember of it is this, good overall frequency extension but a little glassy in the upper mids, the treble a bit tipped up and steely the bass however nicely extended with very good weight and control.

It comes up short against the Earth HDAM in other words.....but is a decent performer none the less. To artificial sounding to my ears though. I actually prefer the old 627BP over it (LM4562).

The LT1364's are a well known quantity in the H/Amp of the Zero and do very very well there. They are not a good candidate for the DAC OPA slot though as they quickly overheat in that spot. Thermal issues cause IC based OPA's to become unstable in a hurry the stock 2604 is better suited to the electrical properties of that section , that being said it's an ordinary performer SQ wise and is usually replaced right away because of that. But you already knew that having followed this gargantuan thread no doubt

I hope that helped you a little.

Peete.

^What other op-amp samples should I get?

And how many HDAMs would I need to order, and more specifically which one (My first home DAC unit, be gentle )?

Those of you who purchased a Zero from wsz0304, how long does shipping take?

Its been 2 business days now, and still no reply to emails or a tracking number............

Chinese eBay sellers tend to just post stuff without informing the customer, specially if they sell a large volume of gear.

Send them an email, they are usually VERY responsive.

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I have done the small mod, clipping away the brown things beside the RCA outlet, but I would like to get them back on, the problem is that I just threw them away and now I do not know what they are ???
I know it is capasitors but they probally have a number or something on them....
Could someone be so kind to enligthen me ??

Got a tracking number.

Can't wait!

I'm considering franken-modding my Zero as well, but how does the sound change, and is it difficult to install the parts?

Prickly Peete will know. Or you can post in the FrankenZero thread.

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You'll want to hit the DIY Forum and peruse the FrankenZero thread.

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