Well this is certainly a great forum.
posted this thread over a week ago - got 87 views and not a single reply.
I did get an email from Nicholas at TC Support though. Just to help out Nova Delay owners here's what he said
Response (Nicholas) 10/24/2008 07:30 AM
There's no problem using Nova Delay with a 9v supply. The pedal needs a certain amount of mA (300mA t run and around 400mA when starting up) so it won't work with every 9v supply out there. But no matter what - you won't damage the pedal using a 9v supply and there's is no loss in audio quality... unless:
1. You're running a very hot signal into the pedal: This could fx be a guitar through a 20-30dB boost or distortion pedal into Nova Delay or having the pedal in the effect loop of your amp IF the effect loop is a Line level (+4dB) loop.
2. You have the pedal in a line level loop and your power amp needs a very hot signal to work properly.
The explanation is actually rather simple: When you lower the voltage you're also lowering the maximum input and output of the pedal. In other words: with a 9v supply Nova Delay won't be able to handle as hot/loud an input signal before it starts clipping. Similarly it won't be able to send out as hot an output signal as with a 12v supply.
The way to check whether you're within the gain range of the pedal with a 9v supply is pretty simple: For the input part simply listen if the pedal is making ugly digital distortion when playing at loud levels... you'll know if that happens!
The output part is a little trickier: If you have the pedal in fx a line level loop which is a very hot signal, the pedal won't be able send out the same amount of gain again on the output. The result is that you'll notice that your sound will be lower (if you're palying with distortion it may sound as if the pedal is "eating" the overdrive) compared to if you removed pedal from the signal chain entirely. That is why fx a Boss Digital Delay sound like cr*p in an effects loop... It's gain range isn't wide enough to handle such a hot signal.
To sum it up: No matter what you can't damage the pedal using a 9v supply. And if you don't notice digital distortion OR a level drop when the pedal is in the signal chain, there's absolutely no problem using it with 9v supply.
I've since been running the ND on 9v with no issues