Have had a few people ask for a comparison and I happened to get one in for trade -- so here it is. Not sure if this is factory or from the repair but the AQ also uses Fairchild output parts vs. IRF parts: * SAZ-3500D is a bit longer and wider * SAZ-3500D has 20 caps in PS section vs. 16 in the AQ * Another view of the power supplies in comparison * Output sections : Output inductors are equal, SAZ-3500D uses 16 outputs vs. 12 in the AQ * SAZ-3500D Transformers compared to a dollar bill *