When using a Burr Brown OPA134 opamp for revising / upgrading Quad amplifiers like the 34 and the 306 make sure Pin 8 is connected to nothing.
Pin 8 is the offset-input. If it is connected to pin 6 (like in some versions of the 306) this wil cause problems with the DC-feedback and result in a DC Voltage on the output.
You have to cut off pin 8 or cut the track on the PCB-board.
In general, when using the OPA134, OPA604 or OPA627 in a Quad revision project pins 1, 5 and 8 are not used and should be disconnected.