[HiFi FOR METAL]

Thanks for the photos, it is great to see how well built the PSU1, and Solo look up close and inside, Also it looks like he is using copper trace on his PCB, is that right? If so that is just another reason to like the product.

 

[charley phogg]

Quote:

Originally Posted by HiFi FOR METAL /img/forum/go_quote.gif yeah, actually I do go out to St. Louis, I was really curious, I am considering perhaps ordering one and wanting to know how well the two have synergy together. So it is good to know that they do.

I'll PM you.

 

[charley phogg]

I just turned it off for the first time to open it up. My traces are on the underneath side of the board. The quality of the workmanship is as evident inside and out as well as in the sound. As you can see from the pictures. I think it would be safe to say that nothing was risked to degrade the sound.

 

[charley phogg]

Quote:

Originally Posted by davewhit /img/forum/go_quote.gif Inside one Upgraded power supply

Thanks for posting those pic's, Dave. It would take me a week of Sunday's to figure out how to do that.

 

[charley phogg]

Forgot to mention that the 2 sets RCA input jacks are gold plated. Along with the Phone jack.

 

[davewhit]

Quote:

Originally Posted by charley phogg /img/forum/go_quote.gif Thanks for posting those pic's, Dave. It would take me a week of Sunday's to figure out how to do that.

My pleasure like the insides of this one better

Black Cube

 

[bada bing]

Quote:

Originally Posted by davewhit /img/forum/go_quote.gif Inside one Upgraded power supply

What is the going price for a solo ? I see the suggested retail is $924 US ? Is it available for a discount off retail ?

For someone with a technical bent, what opamp is used in the gain stage ?
It looks like an active ground configuration with no buffer opamp ? Is that a discreet buffer stage up at the top ? Does it use BJTs or FETs ?

 

[majkel]

AD823 and BJTs. Do search some reviews, it's all been said there. It's a unique schematic (not revealed, obviously) as Graham said, that is more current than voltage amplification based which makes it plays similarily loud on different headphone impedances. These are verbal shortcomings of course but just to enlighten the idea.

 

[majkel]

<double post>

 

[jimmy8269]

Quote:

Originally Posted by charley phogg /img/forum/go_quote.gif Thanks man, can you recall/explain as much as you can about what,or how it changed your 650's? I'm curious for future reference.

For my experienced, I used hd650 to pair with many amps e.g. Heed, X-Can V3 and PR-II. The sound was difference and seemed good in various characters. However, it just sounded right with Solo in the sense of speed, tonal balance, smooth egde, airy with impactful.

Note: my favorite kinds of music are pop/rock, indie, jazz and R & B. With Grace M902 the sound from hd650 will be more opened with wider soundstage.

 

[Greg TT]

Quote:

Originally Posted by davewhit /img/forum/go_quote.gif Inside one

It's 2008, isn't it?

The Solo above is MkII. The Green one looks like 2007 model

 

[charley phogg]

Quote:

Originally Posted by bada bing /img/forum/go_quote.gif What is the going price for a solo ? I see the suggested retail is $924 US ? Is it available for a discount off retail ? For someone with a technical bent, what opamp is used in the gain stage ? It looks like an active ground configuration with no buffer opamp ? Is that a discreet buffer stage up at the top ? Does it use BJTs or FETs ?

I would contact Graham or John C using the link I provided on the first page.

 

[charley phogg]

Quote:

Originally Posted by jimmy8269 /img/forum/go_quote.gif For my experienced, I used hd650 to pair with many amps e.g. Heed, X-Can V3 and PR-II. The sound was difference and seemed good in various characters. However, it just sounded right with Solo in the sense of speed, tonal balance, smooth egde, airy with impactful. Note: my favorite kinds of music are pop/rock, indie, jazz and R & B. With Grace M902 the sound from hd650 will be more opened with wider soundstage.

Thanks for that. Was curious for my next upgrade.

 

[charley phogg]

Quote:

Originally Posted by Greg TT /img/forum/go_quote.gif It's 2008, isn't it? The Solo above is MkII. The Green one looks like 2007 model

Yes, the green Solo is a modified '07 to be used with the switch mode power supply. Graham spent many hours tweaking it to get the sound of the Solo/PSU1. All of the mods were hardwired underneath the pcb.

 

[charley phogg]

Quote:

Originally Posted by Greg TT /img/forum/go_quote.gif It's 2008, isn't it? The Solo above is MkII. The Green one looks like 2007 model

Yeah, thought I was loosing what little mind I have left

. I could of swore I saw a newer one that looked close to mine.