> Yep it works for me now after syncing the LTSpice release (it was quite o= ld...). =A0The collector resistors or base resistors must be different to m= ake it start (or using two different transistors works). =A0Making the two = capacitor values different (even x2) does not make it start if the other co= mponents are equal however. =A0The period is also about doubled compared to= having the base resistors in the correct location. I wonder how the real world frequency compares to the modelled one? When LTSPICE has difficulty modelling reality and you have to do clever hings to make it work there is often summat aglae. Sometimes this is due to a component *needing* to be non-ideal (such as adding a minute series R to an inductor, but 'needing different transistors BUT having the standard version start OK' is interesting. Russell --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .