I've got a SFVC with a couple of problems. The tremolo circuit's speed seems ok, but the intensity does not respond until you get past 7. I tried the easy stuff first: swapped out 12AX7s, cleaned pots. None of those were fixes. The three ceramic capacitors do not appear stock, but seem to have the correct capacitance ratings. I have not been able to decipher all writing on them. One is labeled with: BC 25u 203Z. The other two are: BC Y5P 103K. I get that 103 and 203 are 10,000 pF and 20,000 pF, respectively. K refers to tolerance. I can't find anything on the rest. Can anyone help me out with that? Are they rated appropriately for voltage? The cathode cap is not original and is rated at 25uF/25V. I plan on replacing it with 10uF/50V. Could it be a culprit as well? Edit: there are 2 of the .01uF and 1 of the .02uF caps.