DRIP PULTEC V2 low end anomaly need help!

[fluxofpinkindians]

I just built the Drip Pultec V2.

Checking in Spectrafoo I noticed that the curves for 20, 60 and 100 hz behave as expected but for some reason the 30hz curve is almost identical to the 100hz curve (differs after 1.5khz). Pic attached.

Could this be a faulty capacitor or a short at the low freq selection switch ?

Would really appreciate any help or suggestions.

with thanks

 

[gurkan75]

In some pultec designs the 100Hz capacitor stays in circuit for all positions, in parallel with other values to create 20/30/60Hz. If the Drip pultec is like that, yes, either the switch or the cap or a faulty connnection to ground or switch would give you that result.

Johan

 

[fluxofpinkindians]

Problem was cold solder at low frequency selector switch - solved