They are the same chips for the Nashville 112,except you need 5. I got 5 x Burr Brown ones from the US for my NV 112. Came to about £12 with posting. Easy mod to do. Regards Graham
It's easy to fit, remove the amp from the cab , look for 4 chips on the circuit board. make a note of the little notch on the chips , remove the chips with a small screwdriver and replace with the new ones matching the notch
One thing you have to be careful about is if you do change them you may suffer from very loud speaker popping when you switch on or off. When I had my very first 130 I changed the 4558's for 0PA2604's and I got bad popping. Buggered the speaker. It seems the better quality the chip is the worse the POP. Dave.