carver av 505 opamp upgrade for TL072?

Htguy · 28th March 2005, 01:30 AM

Hi,

I have been looking into upgrading the opamps in my carver av505 5 channel amp. It uses TL072cp opamps. They are j-fet type with a max of 30v in an 8pin dip package. What would be a good upgrade of these opamps?

Thanks for your help.

God bless...

mark

jackinnj · 28th March 2005, 02:23 AM

the best new opamps are generally surface mount -- so you can use an SMT to DIP adapter. Use the parametric search engines at Analog Devices, Texas Instruments, Linear Technology.

the TL072 isn't a bad opamp at all. you might find, however, that improving the power supply regulation with lower noise, faster response discrete circuitry (i.e. use the Jung Super-Regulators as done in AudioXpress modification of the Adcom preamp) would be a best first step. if you can, get a service manual for the device.

oh, one other thing -- an EMI/RFI filter on the power input is a really good idea -- all of the switching power supplies used in your house contribute to a hostile environment for audio. You can get a small unit from Jameco or Digikey which replaces the male power receptacle on the chasis with an incorporated bifilar choke and polypropylene capacitors for a couple bucks.

DigitalJunkie · 28th March 2005, 02:40 AM

"oh, one other thing -- an EMI/RFI filter on the power input is a really good idea -- all of the switching power supplies used in your house contribute to a hostile environment for audio. You can get a small unit from Jameco or Digikey which replaces the male power receptacle on the chasis with an incorporated bifilar choke and polypropylene capacitors for a couple bucks."

Or,if you have a well stocked "junk room",You can scrounge a couple from old monitors,and PC PSU's.

I've found 5-6 of them so far.
They usually only cost about $5,less at most surplus places.

28th March 2005, 01:30 AM	#1
Htguy diyAudio Member Join Date: Aug 2003 Location: Tucson AZ	carver av 505 opamp upgrade for TL072? Hi, I have been looking into upgrading the opamps in my carver av505 5 channel amp. It uses TL072cp opamps. They are j-fet type with a max of 30v in an 8pin dip package. What would be a good upgrade of these opamps? Thanks for your help. God bless... mark

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28th March 2005, 02:23 AM	#2
jackinnj diyAudio Member Join Date: Apr 2002 Location: Llanddewi Brefi, NJ	the best new opamps are generally surface mount -- so you can use an SMT to DIP adapter. Use the parametric search engines at Analog Devices, Texas Instruments, Linear Technology. the TL072 isn't a bad opamp at all. you might find, however, that improving the power supply regulation with lower noise, faster response discrete circuitry (i.e. use the Jung Super-Regulators as done in AudioXpress modification of the Adcom preamp) would be a best first step. if you can, get a service manual for the device. oh, one other thing -- an EMI/RFI filter on the power input is a really good idea -- all of the switching power supplies used in your house contribute to a hostile environment for audio. You can get a small unit from Jameco or Digikey which replaces the male power receptacle on the chasis with an incorporated bifilar choke and polypropylene capacitors for a couple bucks.

28th March 2005, 02:40 AM	#3
DigitalJunkie diyAudio Member Join Date: Apr 2003 Location: Portland,Oregon Blog Entries: 4	"oh, one other thing -- an EMI/RFI filter on the power input is a really good idea -- all of the switching power supplies used in your house contribute to a hostile environment for audio. You can get a small unit from Jameco or Digikey which replaces the male power receptacle on the chasis with an incorporated bifilar choke and polypropylene capacitors for a couple bucks." Or,if you have a well stocked "junk room",You can scrounge a couple from old monitors,and PC PSU's. I've found 5-6 of them so far. They usually only cost about $5,less at most surplus places.

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