Pearl 3 Burning Amp 2023

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#4,821
@mhenschel Yes but that's because most of the posts dealt with copyright and patent matters -- that are not the purview of this site. The good news about that thread was that it was cleansed of the worst violators and all of their posts removed. This is a positive step.
@grataku Yes, trust but verify has been the mantra since the Reagen days. But there's another possibility. People can demand proof when their real intention is manipulative. Want to intimidate someone who is advocating (whatever) that doesn't fit with your business operation? Demand proof about (whatever -- however accurate). Worried about losing market share to EVs? Demand proof that lithium batteries are not dangerous. Works best if the demanding party gets to set the parameters for testing.
And I agree with grataku that the MendItMark thread was not, largely, out of control. As I said in one of the posts there -- Mark gets acknowledgement and respect for his skill, Evans gets a great deal of free publicity (I visited his site and it is an interesting good/bad experience) and everyone wins.
I did, btw suggest that the Pearl 3 would likely outperform the MasterGroove and that got some elevated responses...
 
#4,822
grataku said:
Also, it depends on the measurement type, but if we're talking PS noise, these are the simplest measurement known.
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And if you use REW it is automatically supplied. My suggestions above have nothing to do with measuring difficulty. It has to do with operating procedure. If, as a musician, you trust your ears because you have spent a lifetime of developing their accuracy, a simple change in noise level is so obvious that measuring it seems irrelevant. And you, too, grataku have two of the tools needed for measuring this pre-regulation claim -- the PCBs and the stock PSU. Just get one of Randy's PSU PCBs (2 is better) and check out the claim yourself. You will also need, of course, a cord to plug it into your computer's A/D card. Warning -- when you try dual PSUs on the P3 you're going to want to use them...as tonyEE suggested above.
Today I spent 2 hours adjusting the bias, AC gain, and DC offset on a problem Aleph 30 board that has caused me constant troubles. With the fine instructions supplied by RHThatcher, the process was straightforward and helped along by my favorite signal generator -- a Rigol DG1022, This is a completely different device than my other generator -- a HP 4204A. More resistors in the 4204A than you would think existed in 1967 -- and still working after 58 years. They don't build them like that anymore...nor do they want to (LOL). And, oh, I should add -- it still is close to spec.
 
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#4,826
What bothered me about the MendItMark YouTube video was the creation, then advertisement, of the service manual Mark created. He stated that this would be available to his upcoming students and this was a clear legal violation. If he was using this for advertising purpose (to garner new students) then he injects financial gain into the copyright/patent issue and opens himself to legal action. Will be interesting to see how all of this pans out and I agree with mhenschel that white hat cowboys were absent -- as they seem to be everywhere these days. BTW, watched the video a second time towards the end of the DIY thread and was turned off by the nasty prelude of the fellow who was rehosting the video. His constant comments about tax liability and his fights with UK and IRS agencies were inappropriate. "Let's have a fight" he was suggesting.
 
#4,830
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#4,834
@Netlist
Sorry, my fault I guess. I misunderstood something @Craigl59 told me about his Pearl3 power supply regulation on another thread and I was just chasing for an update here.
As a pioneer project this Pearl is odd. out of the box it performs really well. But the point of the thread is to look at enhancing and optimizing various aspects, no?
Voltage regulation might be the most likely of these. Casting about for ideas is normal.
 
#4,836
Boydk said:
"Guess a cartridge"
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Actually, the idea of this seems a good way to describe the SQ or perhaps "accuracy" (actually, RIAA conformance, frequency response, etc.) of a phono stage. I can definitely hear a difference between my MC cartridges through any of my 3 Pearl 3 units through the same signal chain, even though they are all in the same general price/quality range. I don't have MM anymore, but I would speculate that those running MM carts discern differences between them pretty easily through the P3. Some of my other outboard phono preamps and a couple of my built-in phono sections seem to obfuscate the audible differences to some degree.

I'll give your file a listen.
 
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#4,839
Hi All, getting around to working on the Pearl 3 after a break required after some health issues. My challenge is that the fine motor skills in my hands have deteriorated to the point where i draw a straight line and it looks like a hyperactive rodent's EKG. Additionally, thanks to the illness, my sight is failing too. Crap.

So I can still manage to find and more or less correctly solder a resistor and a cap, but these SMDs are beyond me. Cripes, I can't find them on my workbench. The good news is that I happen to have a nice set of matched Toshiba 2SK170s here. Has anyone used them in this build instead of the little gnats? If so, are they soldered on the same pads that the bugs go on? If anyone has a pic or two that I can enlarge, it would be greatly appreciated. It is quite the adventure trying to build stuff wearing cloudy goggles and a pair of wool mittens.

Happy holidays to all at DIYAudio. This site has provided endless entertainment, information, and good spirit. Not to mention really nice DIY projects! Before I started my journey into entropy, I was able to build 3 Korg Nutubes and an Aleph J, and love them.

Thanks for any help on this!
 
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