Dear Geoff
I have tried all 8pcs of BUX80 but we have to change some resistances in the MULTIVIBRATOR BOARD so to overcome the overall gain / output ratio. We have a NEURODYNE ESU tester, so we can test different resistance to output power ratio.
So i cant tell u the exact resistance value.
On the other hand if Q1 & Q2 are original transistors then there is either v few changes needed or some times it will work in first attempt.
Again i will explain that the BUX80 will not be able to deliver max 350-380watt output in Cut. But i have achieve 350watt max in one SSE2L (lucky client).. Here in Pakistan, customers & hospitals cant afford original transistors as their cost is way high..
Hope it helps. Thanks..
The real replacement of valleylab original transistors is v difficult because of high hFe gain, which is not available in market.. If customer can afford original transistors then u should buy from SOMATECHNOLOGY, replace all, do keep others as spares..
Good luck..