Charge pump voltage offset issue

[trixdropd]

I built a chargepump circuit for bipolar power with a tc1044 based off the hume free a/b/y at ggg. For some reason, the - out is half a volt lower than the input voltage. This seems to be causing distortion on the inverted outputs on my tl072's it powers.
I removed the chip and breadboarded it and the power is fine. In circuit though I can't get the issue to go away. What could I be doing wrong?
http://www.geofex.com/FX_images/humfree2.gif

[Govmnt_Lacky]

Diode drop? 

[trixdropd]

Diode drop? 

There are none.

[trixdropd]

I haven't solved this, but I'm pretty sure it's the opamp rather than the voltage. Side b is very low and distorted, but I have multiple tl072's in parallel and only 1 has an issue. I swapped it out but the problem is the same. Gonna look for a solder bridge.

[trixdropd]

It was a micro solder bridge on the output of the inverting side. Sounds good now! I guess the 1/2 volt drop between +9v and and -9v don't matter, even though on the breadboard there wasn't quite a drop.

[PRR]

> the - out is half a volt lower than the input voltage.

That's the way it works. It is a voltage-doubler, but not perfect. There's always loss. Diodes, or in this case probably FETs (internal).

> This seems to be causing distortion

No. Chip opamps work fine with unbalanced voltages. You only need "enough" to cover your signal (plus losses). -8.5V is more than enough to cover guitar swings.

Yeah, solder-bridges suck tone real bad. I hate when that happens.