Hi All, I have a Tektronix 2710 spectrum analyzer. It seems to be much more similar to a 2711-2712 model, certainly a very last production of the 2710 model. The 100 MHz crystal from the reference oscillator is broken. Can anyone tell me where i can find such a part ? Tektronix says it is not supported anymore ! 73, Patrick http://tk5ep.free.fr