lordmortlock:Is that instead of the LM4562NA op-amp upgrade?
Yes, the THS4032CD is an alternative op-amp upgrade to the LM4562NA.
There's an interesting thread about modding the 7520
here.
chebby: Not sure about the other one mentioned. (THS 4032CD) I seem to remember a debate raging somewhere about the components touching the inside of the casing and ebay suppliers who had not actually tested the upgrade before selling it to see if would fit! Proceed with caution unless you are feeling adventurous
Agreed, definitely proceed with caution. The eBay selller I mentioned above does state in his description that they have been made to fit in the 7520 with no problems. There seems to be plenty of happy customers in his feedback profile who back this up as well.