On 6/18/2024 9:36 PM, Michael Kana via ARC5 wrote:
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