uA726 replacement, (the comedy of errors)

[Grant Richter]

Is it possible this is a beat frequency occurring with other VCOs through
the power supply lines? I have seen this kind of effect with multiple VCOs
running from the same power supply line without decoupling. A small
value resistor (1-10 ohms) in series with the power supply inputs
to the board should "decouple" the circuits if that is the case.

> 
> I am experimenting with an integrator/comparator saw VCO ("ASM1 style")
> that does this.  Unfortunately it also has an additional "wobble" of
about
> +/- 5 cents with a period of about 15 seconds.  I am stumped as to why
this
> is happening.  I've tried to use all the proper components: good power
> supply, .01uf caps on the board from supplies to ground, MAT02 pair &
C-2AQ
> tempco heat-sink-gunked together, 50 ppm metal film resistors, multi-turn
> trimmers.  Has anyone experienced this kind of behavior before?