Quote: Originally Posted by R3SET Wow thanks a lot! Thats a lot of useful information. btw; what do you think of the sound of these amps? (compared to more modern amps) Frankly, there isn't that much progress in newer designs. The circuits are quite similar and some "newer"...

Quote: Originally Posted by R3SET Ok i think it's better to not open it myself, because i have no experience whatsoever in repairing electrical devices, let alone high voltage equipment Smart thinking! Voltage conversion: I have an AA-100 and it has no provisions for 220V AC...

Quote: Originally Posted by Uncle Erik you could get away with a putting Sprague Orange Drops inside. Those run $1-$2 each The best kept secret in tube DIY are the Dayton foil/film caps around $1-2 from Parts Express. They are only available in 4 values and 400V max, but that's...

Quote: Originally Posted by NightOwl The consensus was that it was a good basic deck with the occasional quality control problems (motor, power supply, bearing). That pretty much sums up the basics, but it gives no clue on musicality. The motor mount is the bare minimal and you...

Quote: Originally Posted by NightOwl Here in North America at the height of vinyl's popularity, you could pick one up used for $50.00 But at the same time you could also find the Sugden BD2 for not much more. It's not suspended and therefore may not look "as impressive", but I'll...

My thoughts on the AR-XA tonearm are that it's one step away from a rake... OK, maybe I'm a bit harsh, but precision tonearm it ain't... I'd consider first a replacement tonearm. I've got more precision and better sound from a cheap Japanese-made Harman Kardon and Technics. The only thing I...

Quote: Originally Posted by reemixx Ori: Fair enough. Maybe I'll look into it, after I've tried rolling opamps and burning in a little more. Where can I find more info about the mod? Read my post with pics on page 130 of this thread.

Quote: Originally Posted by reemixx Cheers Ori. I read somewhere that it was more the CS DAC that needed bass improving with bypassing the coupling caps, and that the AD was pretty good? Either way, I'm not a DIY person, so that's not something I'll be doing myself. Actually...

Bass will improve with bypassing the four coupling caps on the analog PCB. The LT1057 do not sound good in this circuit. Replacing them is mandatory. Then give the unit more than 20 hours...

Quote: Originally Posted by Traddad Some of what is happening to my system: Computer + DAC on wall AC = Hum Computer + DAC on battery = No Hum Based on that observation, it's clear that you have a crappy wall supply. These are not grounded to the mains ground, so the noise...

Quote: Originally Posted by ZenErik Do you know if the OMZ upsamples or oversamples at all? I'm just curious. Two different terms. "Oversampling" is a technique of converting digital to analog in small chunks. That's a "feature" of any delta-sigma DAC chip, which is 99% of the...

Quote: Originally Posted by grawk The OMZ is well known for having trouble locking to digital signals. Try turning it off and on a few times. Forget that! No such issue from v4.1 on, which is over a year now. The current v4.2 is playing 176.4/24 HRx (without the proprietary HDCD...

Quote: Originally Posted by haclongba After moded wth zapfilter 2, sound become beautiful, more space, natural ......but when I update clock generator with Lclock Xo3 , sound chage like analog after some hours hearing, sweet and more emotion with my AKG K701(just about 80 hours...

Quote: Originally Posted by athenaesword i don't think the coax one is touching, but the bottom RCA out looks like it might be touching. how would i put electrical tape under it though? or would tightening/loosening the nut so the flatter edge doesn't touch work? it was working...

Quote: Originally Posted by athenaesword make sure what does not touch the ground on the board? I've checked, the copper coming out of the black cable isn't touching the coax connector. Not the wire. Check the nut clamping the jack to the panel. It might be touching the board...

Quote: Originally Posted by athenaesword what dya mean the history of the unit? According to him, it's the 2.0 version, and he replaced the coax out to gold ones. I said to ask about the history of the unit, since the plug-in board looks unlike one I released. Part of that...

Quote: Originally Posted by athenaesword brought in from overseas it's been such a disappointment. First check if it's compatible with your AC voltage. Looking at your pic, the plug-in board has parts which I remove. Ask the seller what's the history of this unit.

Quote: Originally Posted by athenaesword Does my omz have opamps at all? Yes, in the DC servo loop. Not in the signal path, which is a zero-feedback circuit. Quote: Originally Posted by StanleyB1 One would be easily fooled by such talk that discrete is better than opamp...

Quote: Originally Posted by Sherwood Great news! When is that coming? That's already "old news"... Email me directly for details.

Quote: Originally Posted by Sherwood So, Ori, when are you going to start making some more of those Dynaco preamps with your DAC built in? I missed the last one up here, and I'm in need of both functions Ahh... That was a total experiment at Mike's request, but it highlights the...

Quote: Originally Posted by krmathis True! Dac, pre-amplifier and amplifier are all different parts/units of an audio system. They can be collected in one box though... That's one way to look at it. I see these as seperate functions, but for a significant segment of the market...

DUPE

Quote: Originally Posted by mwofsi Also on the list of to be improved is the ALPS pot for the headamp. Of course ALPS make some really good audio pots, but they make some very ordinary ones too. Mike, I don't recall if you have the 22-step or the carbon-composition ALPS. Despite...

Quote: Originally Posted by mwofsi There appears, for instance to be an opamp servo based on an LT1057 opamp. This is the same opamp supplied with the Zhaolu in the first place as an output stage isn't it? I've read Ori himself deriding this opamp. Whilst dc servos use lo-pass filters...

Quote: Originally Posted by Jo-Vo My original question was (I'm sorry for explaining it really bad): If I have 2 poles looking at the phono plug and 3 poles (2 cores and 1 shield) looking at my cable, which poles to use in the cable? The 2 cores or one core and the shield? You...