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"The Wire" Official Boards for All Projects Available Here!  BAL-BAL, SE-SE, LPUHP
"The Wire" Official Boards for All Projects Available Here!  BAL-BAL, SE-SE, LPUHP
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Old 31st March 2019, 12:59 AM   #1061
picovolt is offline picovolt
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Join Date: Mar 2013
Location: S.F. Bay Area
Smile Thanks Owen!

Hi Owen,

Thanks for the speedy and assuring reply—the board image helps a lot also. (It used to be so easy to look at aboard and see pretty much everything.) I'm going to need to study the board image to understand the V+ caps, this is still a bit of a mystery to me.

And thanks again for the wire series; it has brought me many hours of listening pleasure!
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Old 6th April 2019, 01:39 AM   #1062
aive is online now aive  Australia
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Join Date: Sep 2013
Owen's back!

Sabrosa requested a photo and further details of the MPUHP amp. I've attached a photo and schematic.

Owen - I hope you don't mind me sharing these. Let me know if its an issue.
Attached Images
File Type: jpg IMG_20150326_204301.jpg (151.9 KB, 239 views)
Attached Files
File Type: pdf AMPV2.pdf (129.5 KB, 52 views)
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Old 6th April 2019, 04:07 PM   #1063
opc is offline opc  Canada
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Join Date: Oct 2004
Location: Ottawa, Ontario, Canada
"The Wire" Official Boards for All Projects Available Here!  BAL-BAL, SE-SE, LPUHP
Hi Aive,

It has been a while! I don't mind at all

How have they been working for you? I'm finally back to using my pair as the main amplifiers with my line arrays after finally getting a pair of subwoofers to integrate properly.

Regards,
Owen
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Old 6th April 2019, 04:40 PM   #1064
Dmytro19841 is offline Dmytro19841  Ukraine
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Join Date: Mar 2019
Location: Kyiv
Hi, Owen!.
Are BAL-BAL SE-SE, PSU boards available?
Is it possible to deliver to Ukraine?
If I sign up, how much time will it take to prepare the boards for shipment?
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Old 7th April 2019, 12:05 AM   #1065
aive is online now aive  Australia
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Join Date: Sep 2013
Quote:
Originally Posted by opc View Post
Hi Aive,

It has been a while! I don't mind at all

How have they been working for you? I'm finally back to using my pair as the main amplifiers with my line arrays after finally getting a pair of subwoofers to integrate properly.

Regards,
Owen
I’ve been using the MPUHP the entire time, still my only speaker amp :P Still sound stellar to me - I still haven’t cased it though ><

I also got an active sub to support my LS50s :P the upgrade itch never ends.
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Old 16th June 2019, 01:57 PM   #1066
IanAS is offline IanAS  England
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Join Date: Dec 2004
Location: London
Sorry if this is a question already asked and answered many times over recent pages.

What op-amp is substituted for the LME49990?

AD797?

Can it be done instead with the OPA1632?

Last edited by IanAS; 16th June 2019 at 02:04 PM.
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Old 17th June 2019, 09:25 AM   #1067
IanAS is offline IanAS  England
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Join Date: Dec 2004
Location: London
Sorry, I meant can the phono stage be done with 3 x OPA1632 instead of 3 x pairs of 49990 (797)?
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Old 17th June 2019, 10:20 AM   #1068
BamboszeK is offline BamboszeK  Poland
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Join Date: Jun 2012
OPA1632 is fully diffrential dual opamp. It is special type and can't directly subtitute most of opamps.
LME49990 can probably be replaced by OPA1611, AD797, OPA828 or any other high performance single opamp. This isn't that straightforward and will probably need lots of testing to ensure stability, performance and compensation.
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Old 17th June 2019, 11:09 AM   #1069
IanAS is offline IanAS  England
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Join Date: Dec 2004
Location: London
Thanks for your response

With 'The Wire' phono stage, a new PCB would be needed, but could the 1632 replace the pair of op-amps, and join the two inputs, and feedback after the 1k's, together with the 100 Ohms?

3 Stage Balanced Phono Preamp.pdf - Google Drive

I recall OPC saying that before the 49990 his favourite op-amp was the AD797, as it was mine, in general. But that was many years ago. I'll have a look at the OPA1611 and OPA828.

Last edited by IanAS; 17th June 2019 at 11:11 AM.
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