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Old 7th August 2003, 02:43 AM   #1
Htguy is offline Htguy  United States
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Join Date: Aug 2003
Location: Tucson AZ
Question Denon dvm 3300 op-amp upgrade

Hi,
I'm new to the site so please be kind if I'm in the wrong area



I am looking into the possibility of upgrading the opamps to burr brown opa 627 for the I-V and output stage. Are the present ones on the double sided board that has the DD chip (I think that card is all digital) or are they under the main circut board?

Also, is there much advantage to upgrading the Caps and resisters?


Thanks
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Old 8th August 2003, 06:32 AM   #2
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Join Date: Aug 2003
Location: SoCal
What opamps are currently in the preamp?

Most (not all) audio equipment manufacturers use dual opamps for space/cost reasons. The opa627 is a single opamp and not a direct replacement for a dual opamp. In other words, you can't take a dual out and pop a single in. you could possibly make a "sub board" and mount the opa627's the sub board and run the in/out/pwr back to the main circuit board.

One more thing, if the original opamps in the preamp are ne5532 or ne5534 there will be nothing to gain (except distortion) these are cheap and a very old design, BUT they are VERY, VERY GOOD. You can spend a lot more for opa627 (about $12 ea.) but nothing will be gained, in fact distortion figures, in most cases, will probably rise due to the fact that ne5532/4 are have very good common mode characteristics. Without getting to technical, you would probaby be better off replacing them with original parts, because the circuit was tailored to the response of those opamps. If you can't find original replacements, or it uses seriously inferior opamps (i.e. LM1458, or some other u741 variant) get back to me and we will figure something out.

Good Luck!!
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