losing lower frequencies drastically when resonance gets to

[bsmith]

I finished building one of these and have been poking at getting it sounding right in my 12v euro rig. Started with the bridechamber kit - and going through the diodes to match pairs was a bit painful, so after not being satisfied with a first go with those I re matched some from a pile I had. Mine sounds mostly good, but I have a thing where just as I get into self oscilation - even a little, the bottom parts of the signal just drop out, like it suddenly sounds like a high pass filter. I've done the suggested changes for using in 12v, as well as lowering that 680k to 120k, and also made resistor changes when I saw that I was getting more like -7.5v on the -9v out - got that happening as well.
I think maybe I can do an even better job at matching resistors - after my second pass the 'bottom falling out' thing wasn't quite as bad, but it's still going on. Besides getting as tight a match on those pairs, are there any suggestions to getting that straightened out?

[Cardinen]

[bsmith]

[Cardinen]

Ok, i think is a normal behavior with ladders-type filter, mine do the same especially the Diode ladder.
I hope this help.

[bsmith]

[yusynth]

Loss of low-end at high resonance is a normal behavior for the ladder filters either with the Moog or the EMS filter. Cure for this can be added but these filters will no longer sound like the original ones.

[bsmith]

[yusynth]

The trick consists in picking the feedback signal after the Emphasis pot and adding a fraction of it to the output signal. This rquires simulation an calculations though and once again the filter will no longer behave like the original filter...