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SR-71 First Impressions w/pics(dial-up warning) - Page 3  

post #31 of 100
Had the pleasure of listening to this originally at the Chicago meet (its first public appearance, I believe) and was very impressed by its power in my brief listening session (with the HD-650's I believe).

Can't afford it, but would love to get it. Also very curious as to what the mystery chip is that's in there. I need to start an "amps for needy grad students" fund.
post #32 of 100
Quote:
Originally Posted by ampgalore
Then the SR-71 should be called a mini-stealth!
Perhaps if it was a tube amp. Mini HR-2 would be more fitting...
post #33 of 100
Quote:
Originally Posted by donovansmith
I agree with everyone else, that amp does look awesome. And the dimensions are absolutely tiny, especially for something powered by two 9V batteries. The casework is great.
I seem to recall that those two 9Vs powered the amp for over 50 hours, the fiftieth coming near the end of the Chicago meet. Pretty nice.
post #34 of 100
Quote:
Originally Posted by jasonhanjk
A similiar design to A47 or Pimeta.
PIMETA uses a ground channel buffer, a la PPA. If your guess is indeed correct and the SR-71 is a standard buffered-opamp design, then the SR-71 would be better compared to the META42 and CH/A47 amplifiers that came before the PPA and PIMETA.

My guess is that the "buffers" are actually opamps a la the CHA/47, judging by the fact that R9-R10, R11-R12 seem to be feedback resistors. It's been a long time since I've worked with opamps, and I've totally forgotten the standard pinout so I'm not entirely sure. You could, of course, look up the pinout and see if the resistors correspond with what's expected.

Determining what the chips are would be a matter of removing the nail polish with nail polish remover (if that doesn't remove the ink used to label them), or hooking them up to a test jig and running some performance test to see which datasheet they match up to.
post #35 of 100
$400 really? that seems a bit much...
post #36 of 100
Quote:
Originally Posted by eric343
Determining what the chips are would be a matter of removing the nail polish with nail polish remover (if that doesn't remove the ink used to label them), or hooking them up to a test jig and running some performance test to see which datasheet they match up to.
like I said, I have heard directly from Ray that he has removed all markings prior to the nail polish treatment. the performance test idea is something to try out though.
post #37 of 100
its a steal at $400.
post #38 of 100
Quote:
Originally Posted by ayt999
like I said, I have heard directly from Ray that he has removed all markings prior to the nail polish treatment. the performance test idea is something to try out though.
I'd like to know why everyone is trying so hard to figure out the design specs of this amp. Isn't it a hint to you from Ray that he wants to protect himself and his designs? Please just give the poor guy a break and just listen to the amp like you're supposed to...

Sorry, I had to let that out...
post #39 of 100
If he didn't try so hard to protect it, we wouldn't care...

Just like when I posted macro photos of the Headroom amplifier modules as part of my pictures from the World of Headphone tour -- nothing is hidden. People were "oh, I could draw a schematic from that, no problem. But that wouldn't be ethical. What did the XXXX headphones sound like, by the way?"
post #40 of 100
Quote:
Originally Posted by davidmiya
I'd like to know why everyone is trying so hard to figure out the design specs of this amp. Isn't it a hint to you from Ray that he wants to protect himself and his designs? Please just give the poor guy a break and just listen to the amp like you're supposed to...
I have to admit that was my thought too...
post #41 of 100
Davidminya,

I second your comment. I believe that we should respect his design and there are many DIY alternatives to choose from.

The SR-71 is a true bargain given an almost on par performace to the XP-7 and HR-2. I would like to see a head to head comparison b/w the SR-71 and Pocket Reference though.
post #42 of 100
It would be easy to redraw his design but hey. I'm an ethical person. So don't tempt me. )

Anyway, so what if we are able to come up with the design. We still need to sell it in the business world. Only Ray could do it.
post #43 of 100
Quote:
Originally Posted by gpalmer
I have to admit that was my thought too...
Mine, too...
post #44 of 100
You can't possibly say that $400 is to much until you've heard it. I have not heard it, but look forward to taking a listen soon. I have heard many of Ray's products and they all represent an outstanding value at their price point, from the HR-2 all the way up to the Stealth. The design of this SR-71 is fantastic. I love the slide in battery compartment, with no connectors needed to install new batteries. The anodized aluminum chassis is flawless and this is smaller than it appears in the photos. Notice that it's no wider than the two batteries side by side. It could certainly fit in a pocket, and no doubt has the best components available. Ray also pays extremely close attention to component synergy to acheive the astounding sound each of his products have, so it's not just picking "good" stuff, it's picking the right stuff.
post #45 of 100
Has anybody been able to compare the sr71 to a corda amp?
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