Hi Bob, Checked my Omni-A. Found a Burr Brown OPA2604AP Dual Op amp in
there. I did the experiment several years ago. As memory serves the TI
chips were good but I liked the Burr Brown chip mentioned above. Burr
Brown was aquired by TI. These parts are still available from DigiKey. I
think the reason this chip change works so well has to do with it's low
distortion and faster slew rate. I tried some faster Analog devices chips
but found little was gained with them. My suggestion is to install a high
quality socket (8 pin). And try a few parts under listening conditions as
I did. Power rig down for swaps. You will still need to adjust the RF
gain for the stronger signals but the popping to my ears is less annoying.
As always your mileage may vary. I hope this helps. Dave AB0N P.S.
I have a DDS VFO up and running on my rig now. Once the level was brought
down it seems to work exellent. No drift...
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