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02-28-2006, 01:34 AM
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Join Date: Jul 2003
Location: Seattle WA. USA
Posts: 9,128
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Putting OPA627 into Pimeta ground channel..
I just received an OPA627, and (not really being a DIYer) am not sure how to put it into the ground channel socket. Do I line up the notch on the chip with the notch on the socket?
If I put it in wrong would it fry just the chip, or could it take out the whole amp?
Thnx...
__________________
Team Beyerdynamic))))
Digital: Denon DCM-370->Audioquest G-Snake->Pimeta (OPA627s)
Headphones: Beyerdynamic DT880 ('03), Koss Portapro2
Click for Seattle Minimeet 3 pics
I'm visiting Head-Fi much less these days, so Email is greatly preferred over PM if you wish to contact me.
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02-28-2006, 01:44 AM
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Headphoneus Supremus
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Join Date: Mar 2005
Location: St. Louis, MO
Posts: 3,931
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Quote:
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Originally Posted by fewtch
I just received an OPA627, and (not really being a DIYer) am not sure how to put it into the ground channel socket. Do I line up the notch on the chip with the notch on the socket?
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Yes
Quote:
If I put it in wrong would it fry just the chip, or could it take out the whole amp?
Thnx...
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It shouldn't fry it you catch it soon enough. Definitely shouldn't take out the whole amp.
__________________
The waiting game is not fun.
HD600 with Blue Dragon cable (thanks Asr!), HF-1, MS-1, ER-4P/S, Shure SE530
M^3, PINT, PPAS, Hornet, CROSS-1
All out of my trusty Micro DAC.
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02-28-2006, 01:45 AM
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Join Date: Jul 2003
Location: Seattle WA. USA
Posts: 9,128
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Quote:
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Originally Posted by Teerawit
Yes
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Thanks.
Edit -- got it, and it's working.
__________________
Team Beyerdynamic))))
Digital: Denon DCM-370->Audioquest G-Snake->Pimeta (OPA627s)
Headphones: Beyerdynamic DT880 ('03), Koss Portapro2
Click for Seattle Minimeet 3 pics
I'm visiting Head-Fi much less these days, so Email is greatly preferred over PM if you wish to contact me.
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02-28-2006, 01:46 AM
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Headphoneus Supremus
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Join Date: Oct 2004
Location: Manhattan
Posts: 6,147
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What opamp are you using in LR?
__________________
"When stupidity is a sufficient explanation, there is no need to have recourse to any other."
F e e d b a c k
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02-28-2006, 01:51 AM
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500+ Head-Fi'er
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Join Date: Sep 2005
Location: PDX
Posts: 736
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Quote:
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Originally Posted by fewtch
If I put it in wrong would it fry just the chip, or could it take out the whole amp?
Thnx...
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Yes, you can. I fried this way a couple of 843s, they died in less than 10 sec before I realizied that something's wrong.
And no, you can't fry the whole amp
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02-28-2006, 01:55 AM
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Join Date: Jul 2003
Location: Seattle WA. USA
Posts: 9,128
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Quote:
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Originally Posted by The Monkey
What opamp are you using in LR?
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OPA627 (AU I think) in L/R, and I just put an OPA627AP in the ground channel (replacing an AD8610).
To my amazement, the amp appears to sound more detailed. I don't know why replacing the AD8610 with an OPA627 would have this effect (just the ground channel) but it does seem to. I was expecting no change in sound.
__________________
Team Beyerdynamic))))
Digital: Denon DCM-370->Audioquest G-Snake->Pimeta (OPA627s)
Headphones: Beyerdynamic DT880 ('03), Koss Portapro2
Click for Seattle Minimeet 3 pics
I'm visiting Head-Fi much less these days, so Email is greatly preferred over PM if you wish to contact me.
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02-28-2006, 02:00 AM
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500+ Head-Fi'er
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Join Date: Sep 2005
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That's impressive...few can "hear" the ground channel amp.
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02-28-2006, 02:00 AM
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Headphoneus Supremus
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Join Date: Oct 2004
Location: Manhattan
Posts: 6,147
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Quote:
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Originally Posted by fewtch
To my amazement, the amp appears to sound more detailed. I don't know why replacing the AD8610 with an OPA627 would have this effect (just the ground channel) but it does seem to. I was expecting no change in sound.
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Good detailed or bad detailed? 
I'm running the 8610 in my Pimeta and it is mellower than I had anticipated.
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"When stupidity is a sufficient explanation, there is no need to have recourse to any other."
F e e d b a c k
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02-28-2006, 02:03 AM
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Join Date: Jul 2003
Location: Seattle WA. USA
Posts: 9,128
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Quote:
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Originally Posted by Xakepa
That's impressive...few can "hear" the ground channel amp.
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That's why I said "seems to"... it's probably just placebo, since it's the ground channel (!). But I'm not discounting the possibility.
Bass seems weightier too... maybe changing the ground opamp changes the overall circuit's response enough to have these effects... don't know enough about electronics to really say. I've taken a bunch of courses, but it's been a long time.
Edit -- the amp almost seems muddy sounding too... think I need to break the new opamp in for a bit and listen to a variety of recordings.
__________________
Team Beyerdynamic))))
Digital: Denon DCM-370->Audioquest G-Snake->Pimeta (OPA627s)
Headphones: Beyerdynamic DT880 ('03), Koss Portapro2
Click for Seattle Minimeet 3 pics
I'm visiting Head-Fi much less these days, so Email is greatly preferred over PM if you wish to contact me.
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02-28-2006, 02:08 AM
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500+ Head-Fi'er
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Join Date: Sep 2005
Location: PDX
Posts: 736
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Which cans are you using...with 3x627 PIMETA?
10x
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02-28-2006, 02:12 AM
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Join Date: Jul 2003
Location: Seattle WA. USA
Posts: 9,128
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Quote:
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Originally Posted by Xakepa
Which cans are you using...with 3x627 PIMETA?
10x
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Beyer DT880s.
__________________
Team Beyerdynamic))))
Digital: Denon DCM-370->Audioquest G-Snake->Pimeta (OPA627s)
Headphones: Beyerdynamic DT880 ('03), Koss Portapro2
Click for Seattle Minimeet 3 pics
I'm visiting Head-Fi much less these days, so Email is greatly preferred over PM if you wish to contact me.
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02-28-2006, 02:35 AM
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500+ Head-Fi'er
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Join Date: Sep 2005
Location: PDX
Posts: 736
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Hmmm...could be better with 501s.
You have to try 880 with 843s, you might like it.
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02-28-2006, 03:50 AM
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100+ Head-Fi'er
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Join Date: Mar 2005
Location: Amherst, NY
Posts: 242
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Quote:
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Originally Posted by Xakepa
Yes, you can. I fried this way a couple of 843s, they died in less than 10 sec before I realizied that something's wrong.
And no, you can't fry the whole amp
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Did you just get no sound out of the amp when you fried those opamps? If not, how would you know they are damaged?
__________________
Home Rig: Arcam CD73t> Blue Jeans RCA or 12" long DIY RCA's from "Cantsleep"> Headamp GS-1/Morgan Jones tube amp> Grado HF-1 (#433)/Sennheiser HD600
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02-28-2006, 04:08 AM
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100+ Head-Fi'er
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Join Date: Oct 2004
Location: Philadelphia
Posts: 154
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In my experience you get heavy distortion but still music when it starts to go. When it's totally blown, you get a nasty hum thats volume doesn't change when you move the volume knob with no music (kind of like a turntable that hasn't been grounded). Others may have experienced other things.
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02-28-2006, 03:34 PM
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Join Date: Jul 2003
Location: Seattle WA. USA
Posts: 9,128
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Quote:
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Originally Posted by Xakepa
Hmmm...could be better with 501s.
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It is... the synergy with OPA627s and AKG K501 is wonderful. But it's pretty nice with the DT880 as well.
__________________
Team Beyerdynamic))))
Digital: Denon DCM-370->Audioquest G-Snake->Pimeta (OPA627s)
Headphones: Beyerdynamic DT880 ('03), Koss Portapro2
Click for Seattle Minimeet 3 pics
I'm visiting Head-Fi much less these days, so Email is greatly preferred over PM if you wish to contact me.
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