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Hi
The output capacitors prevent the DC offset from the op amp from magnetising the transformer core. The offset should however only be a matter of millivolts so is not normally a problem and as Jim pointed out, chips with even lower offset don't need them at all.
I said that you only need ONE cap because the transformer is wired from one out to another, this is only really precautionary and in any case should be much larger than 100uF (or as you have 2 in series yopu only have 50uF).
As jim pointed out 10pF matched with 22K ohms is rather a high bandwidth so these should be increased and may well be the root of the problem with YOUR layout. I presume that Tim breadboarded it in the past but his physical layout will have been different.
I presume from your list you meant 22 K Ohms not 22 Ohms? That would mess it up big time!
Matt S
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