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Old 10th January 2005, 03:22 PM   #1
mura is offline mura  India
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Question Parasound P/HP-850

I have a Parasound P/HP-850 Peramp,i want to know if i can replace the AD712JN opamps (4Nos) with Burr brown OPA2134.

Thare are also 2 other opamps NJM4556A and NJM072,can i replace these with better quality Opamps.
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Old 11th January 2005, 03:40 AM   #2
mura is offline mura  India
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Question Also....

Also do i need to change any resistors for gain...?

How about the OPA2107?
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Old 11th January 2005, 11:47 PM   #3
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Just change the IC's
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Old 12th January 2005, 07:09 AM   #4
mura is offline mura  India
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Thumbs up Thanks

Thank you for responding, i will change them.

Even without any mods i think the P/HP-850 is the most value in preamps today.

I use it for all my refrence when i build power amps,

I am now working on a High voltage 115-0-115 power amp based on a leech.Output devices are MJL4281A and MJL4302A.

I also have MJL21195 and MJL21196.

Which of the above transistors are recommended for high voltage use?

Thanks.
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