[ChristianFletcher]

It’s probably me David that’s a bit clueless with the modern stuff. But to add insult to injury actual front end FET is mark FET1 on the circuit diagram but it is FET2 on the circuit board. It’s causing me a lot of head scratching. I will update my annotated schematic and upload it again tomorrow

I have removed it from the circuit board and my peak tester is reporting it as a diode although RF transistor often come up erroneously on the tester. Would a MP102 be a useful replacement or are then any easier alternatives for the SK19 to be found at RS or Farnell