Thanks Colin. Just checked R22 and it was indeed high. Replaced it and refitted the AC128- once again I can't get the Q current above 3.2mA or so, there must be something else amiss somewhere.
X2 is the detector in this set, X3 is the bias diode, be careful there are two circuits on the same Trader sheet! In the other circuit (for sets with serial numbers below 70,000) the bias diode is indeed marked as X2. Trader obviously didn't think putting circuits in chronological order was a good idea
Josh.