Quote Originally Posted by Marcel View Post
Doubling the value should halve the frequency so 1nF might be a bit big, try a 680pF first and measure the frequency if you can.

Can do, I think I have at least one solderless breadboard lying around in the studio room in my new flat, I also have my old DSE 20Mhz Dual Trace Oscilloscope so I'll be able to make ballpark frequency measurements, definitely going to invest in a new Digital Scope later this year.