ah ok - so a 15v one definitely would not do? easier to get you see
I think you misunderstood me - your question was: "I can get a 15V AC 150ma+ AC/AC transformer quite easily, will that be a problem?" My direct reply to that was "Most probably not, I'd guess.", with the rest being a technical explanation to give you some more backgound knowledge. But basically it was supposed to mean: Unless the model you go for is "mal-specified" and drops below 15 V under actual load, a 15 V unit should still be ok to let the table-internal voltage regulation work properly.
Alec: I'd give that around a 99.99 % chance, 'cause a 500 mA unit definitely shouldn't drop below the required voltage, as a TD180 needs quite a bit less current. The remaining 0.01 % may be interpreted as "but one never knows"-disclaimer.
Greetings from Munich!
Manfred / lini