I need a Motorola 1820-1188 PLL VCO (16 pin) chip for my HP 3586B selective Voltmeter. The manufacture date is 1980. It is not listed on the NTE cross reference. I have tried all the normal parts suppliers on the web and here in Charlotte. Does anyone have an older edition of the NTE, ECG or any other cross reference that lists the chip? Thanks, Dave Franklin Cornelius, NC