> Any source for those even more obscure UA776 op-amps, which Papareil > used for the Polyvoks VCF clone? I have not been able to find those > anywhere! Must check again.. Good luck finding the UA776! I used the 4250, Mouser part number 513-NJM4250D And I needed at LEAST 1.2Meg for R10 & R11. Makes a nasty screming filter though! Jeff