Hi Karin, The main filter cap in the HT-33A, C-22, is 10uf @3000v, and from the pictures, appears to be oil filled. This should not be difficult to find at a hamfest and possibly through one of the catalogs. If you repost your request with the above specs and if possible, the dimensions of the capacitor, I am sure you will come up with one. 73, John, W4AWM