saw the 1700kc xtal in the “2nd oscillator” so I could use one of those si5351 crystal substitute circuits in that role.
Hi Mike,
You could, but it will take a microcontroller to run it. A programmable oscillator would be much easier and it looks like maybe ECS has backed off on obsoleting their through-hole parts - the ECS-P85-B from DigiKey would be the best choice for about $6.00. You'd need to make some 5 volts for it from the filament supply but in my experience they work fine feeding tube-type mixers. (As a filter - not so much!)
73, Bob W9RAN