The new BurrBrown OPA2211A is another great sub for the OP-275. It's a 27 v/us slew rate, very low noise, 1.1 nv/hz/sq and extremely low offset at 125 uv. S0-8 only, they need a dip adaptor. It also can be direct coupled. These are also rail to rail devices for greater headroom for a given supply. Run them at + - 18 volts and they will output more than other devices. I wouldn't worry about needing those blocking caps for this part. Even a blown opamp won't damage a quality transformer, transformers are used for DC all the time as well as AC. Users could disconnect the output transformer and just run the opamp signal out differentially.
That way you can place the transformer in a box and use it selectivly or add different models.
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Analog, Embedded Processing, Semiconductor Company, Texas Instruments
Jim Williams
Audio Upgrades