Review: ZERO 24 BIT/192KHz DAC/Headphone Amp/Pre-Amp - Page 432

Thanks S-Man, agreed, this type of thing shouldn't happen....I have a feeling the monkey at the factory is about to get his banana ration cut in half....and no flea powder for a week.

Peete.

Heh heh! Scritch scritch Hey, I've been looking at the LD I+, do you know what op-amp they have in there? I can't see what it is in the pic I printed off. Doesn't look a lot of room for an HDAM in there, but hey, it hasn't stopped us so far! 1364 could be on the money? And one of dem NOS pots that we've got on the Zero and with the WE408A tubes .... mmmm ....

S-Man the opamp in the LD I+ is MC33078P.....the pic(s) make the lettering hard to read. I'm uploading pics of the FrankenDAC to photobucket, I'll post some pics of the cap paks on the HDAMs then post some pics of them installed before I put the lid back on....Could you do me favor and look up the data sheet specs on the LD I+ opamp please.

Thanks bro,

Peete.

Righto, on to it.

S-Man are these the right pins .....I need another set of eyes on this to be sure (pins 4 + 8 V- V+) It sure is Fugly



Peete.

PP, couple of data sheets for you. Looks like a pretty good op-amp in the first place. This do ya?


MC33078
DUALHIGH-SPEEDLOW-NOISEOPERATIONALAMPLIFIER
SLLS633C–OCTOBER2004–REVISEDNOVEMBER2006
• Dual-SupplyOperation. . . ±5Vto±18V
• LowNoiseVoltage. . . 4.5nV/√Hz
• LowInputOffsetVoltage. . . 0.15mV
• LowTotal HarmonicDistortion. . . 0.002%
• HighSlewRate. . . 7V/μs
• High-GainBandwidthProduct. . . 16MHz
• HighOpen-LoopACGain. . . 800at20kHz
• LargeOutput-VoltageSwing. . . 14.1Vto
–14.6V
• Excellent Gain and Phase Margins
The MC33078 is a bipolar dual operational amplifier with high-performance specifications for use in quality audio
and data-signal applications. This device operates over a wide range of single- and dual-supply voltages and
offers low noise, high-gain bandwidth, and high slew rate. Additional features include low total harmonic
distortion, excellent phase and gain margins, large output voltage swing with no deadband crossover distortion,
and symmetrical sink/source performance.


http://www.head-fi.org/forums/attach...1&d=1221193034

http://www.head-fi.org/forums/attach...1&d=1221193284

http://www.head-fi.org/forums/attach...1&d=1221193347

Yes, I've checked on KHA's pin nos and they are the same, so you are good to go. My own eyes are going wonky from looking at this screen for a while, I triple checked.

falke401 and Liquid Steel,

When did you buy the Zero DAC? I'm worried with mine, was posted in mail 6-Sep-2008.

Good lucky!

Actually, PP, you might like this better than the first part of the prev one I sent you. S-Man

http://www.head-fi.org/forums/attach...1&d=1221195087

Hi S-Man, thanks for the sheet, links and such !!!! ...I'll have a look at those in a bit, if not tonight ...tomorrow for sure !!

Just about to put the Cap Pak'd HDAMs into the FrankenDAC and give her the juice

Hope it works

Sganzerla,

It's only been 5 days, one of those a Sunday...no need to worry...average shipping time is 5-7 business days not including any customs inspection/delay....relax, everything is fine.

Heres a couple pics of the Cap Pak'd HDAMs in the FrankenDAC ...by god that's ugly



Man that 's a tight fit...I think I need a bigger chassis and I don't like resting the HDAM on top of the DAC chip....have to figure out another spot...

In this pic the cap pak just barely fits under the cover (imaginary one ) while resting the om DAC chip...hmmmm





I going to try another placement idea..

Peete.

From a quick glance of the data sheet an HDAM should be no problem in the LD I+ dip socket...If the section's supply is + - 15V it'll be a simple swap

Peete.

Heres the powered up pics....no poof and cloud of smoke . I just powered up the MF X10 V3 + X-PSU/LD MKIII/HK HD720...heard the relay click for digital lock

Pic 1 day shot...showing new location of 1 HDAM.



night shot showing off those red leds.

5 leds lit means everything is good to go....YES !!!!



Heres a pic showing the new location......dead freaking quiet (listening to Rush-Farewell to Kings - tittle track)




I hope this sounds good for the effort put into it EDIT : It does, it does.....let the cooking begin I'm almost positive this cap pak will take at least 300-400 hours, although it might be less, hard to say. At least theres no hiss,hum,weird phase shifts....etc.

Peete.

Wow, great work, PP! Good pics too. It looks like you've done the electrolytics too? With Nichicons? Yes, you have a lot more of those bigger caps in a row than in my Zero. Some of the Zeros do seem to have diff caps in them in some places. Most of the better caps in my Zero are in the head amp.
Am now lusting after the LD 1+ somewhat. Not sure why, it's just calling to me. It actually has a little more power into 300 ohms than KHA has, and there sure is plenty of grunt in there!
I was thinking/hoping there would be enough space in LD 1+ to leave an HDAM upright, doesn't really look like it though. I do like the neatness of that.
You must be knackered mate? Isn't it past your bed time over there?

BTW, what's the make of the purple input cable?

PS Might be going a bit nutty myself, got a light head cold and there's plenty of cotton wool in there. Not Zero pics above, of course!
In saying that, my above comment on caps in Zeros still stands, plenty of scope for upgrades in the PS dept.

Well sour ( Andrea ) you'll always be the only one that is tone deaf and knock the OPA-Earth..

I use the LT1115 Chip to flush my toilet :-) Does a great job ..

I think you could be correct there , I found the SUN to be great when I first got it but after burn in I found it a bit fatiguing after a while and back to the Earth now which I'm enjoying so much ...

Gavin ...