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These opamps are the ideal choice for Quad (pre-) amplifiers from the 34 on. Because of the power-supply rails you would rather use the OPA134 in a Quad 134 and the OPA604 in a 44.
Stefaan
- Burr Brown OPA134 (for Quad 34, 44 ao.)
- Burr Brown OPA2134 (dual opamp for Quad 34, 44 ao.)
- Burr Brown OPA604 (for Quad 44, 405 ao.)
- Burr Brown OPA2604 (dual opamp for Quad 44 ao.)
Dada Electronics is specialised in Vintage & High-end audio.
You recommended AD797 opamp for Quad 405 upgrade. I tried it with AD797; the Quad 405 oscillates. AD 797 is too fast, even though it is a very low noise opamp. It doesn't work with Quad 405.
ReplyDeleteMay be you have better luck than mine.
Yes, you are correct, it will also be a noisy choice, because of high noise current, it need a very low source resistance. A good choice is to drop the 301 or 071 and put an OPA134, or if you can find, the OP176. This is obsolete now, but is 1/2 an OPA 275 and is very natural sounding in that spot.If you chose OPA604, prepare for a digital sound, nice but not free and dynamic.
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