found a place i can get them for a very good price if i cant get them from where i am planning to get them. Will only know by next weekend though. Found a 40pf to 6p8f trimmer cap for the equivalent of 0.16$ so that shouldn't be a problem. so your saying just replace either one of the 18pf caps with a trimmer cap and i will be able to get the frequency just right, very interested to see how much the frequency varies in practice.
hi,
This image is a copy of my circuit.
E