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Anyone tried changing OPAMPS in Music Hall A25.2?

I have just chnaged the OPAMPS in my Music Hall A25.2 from the stock Burr-Brown OPA134 for some Burr-Brown OPA2107 units and holy shit there is difference in the sound. It is very noticable and very much better! The deliniation of instruments great, bass drive is far better, smoother treble and no more of that goofy midrange weirdness. I run Modified Klipsch Chorus II's and the bottom end just came to life. I am really suprised at the results! The opamps were $30 for the pair from digikey, they rip you hard core on shipping though $10 for like shipping a 3x5 inch box of air. (oh well) They did come pretty quickly.
jffyg

Showing 2 responses by magfan

magfan
1,583 posts
 
I made a headphone amp using OPA 2132s. Similar but more stable version of the OPA 2134, apparently. this is the stereo version of your OPA 134, I think.

Are your opamps socketed? Easy to do 'opamp' rolling at that point, since they all have same pinouts from the half-dozen I've looked into.
magfan
1,583 posts
 
Can't recommend you install a socket unless you have both the skillset and the right stuff. Solder sucker? Solder wick? Real low power iron? Adjustable? Good, hi-end socket?

'Modified' opamp? How so? Unless manufactured from a new set of masks and with modified implant and diffusion parameters? That would make it a 'new' part. It's not like you can open 'er up and just change transistor thresholds and resistor values.

The OPA2132 / 2134 are considered pretty musical.
Try from this list....All have been used in the CMOY headphone amp with various degrees of success.

http://tangentsoft.net/audio/opamps.html
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