BodgeIt schrieb:

I'm trying to repair an ultrasonic cleaning tank and one of the power
transistors has gone. It's a BUY69B, now long obsolete. Can anyone
recommend an equivalent? I'm assuming it's a high voltage, high
frequency device???

http://pdf1.alldatasheet.com/datasheet-pdf/view/2615/MOSPEC/BUY69B.html

HTH

Reinhard