Great find. The 339A is a great improvement over the 333. I have the 339A and 334A, both are very useful instruments. Mine has been seeing a lot of work lately with my current project. Let me know if you need any baseline measurements on the 339A and I¡¯ll try and help you out. Once you get it working I¡¯d recommend checking online for the improvements which can be made. There¡¯s a very comprehensive list on one of the audio forums (audio karma I think). Mine bottoms out around 0.0012% at 1khz but that can be improved.?
