I would opt for a straight passive preamp seeing your amp has 100kohm input impedance, a perfect match.
But you could:
Try the Schiit Audio Freya, as it can be a passive pre, active tube pre, or active solid state pre. So you can suit your mods. All with low gain so you’ll have plenty of range control with your volume control.
Plus it has balanced or rca input and outputs and comes with a extremely high quality 128 position relay based volume control, and it’s all remote controlable as well. For just $699 with a trial period, so you could send it back if you don’t like it.
http://schiit.com/products/freya
Cheers George
But you could:
Try the Schiit Audio Freya, as it can be a passive pre, active tube pre, or active solid state pre. So you can suit your mods. All with low gain so you’ll have plenty of range control with your volume control.
Plus it has balanced or rca input and outputs and comes with a extremely high quality 128 position relay based volume control, and it’s all remote controlable as well. For just $699 with a trial period, so you could send it back if you don’t like it.
http://schiit.com/products/freya
Cheers George