Describe the issue with your volume pot. If it's just noisey or seems to fluctuate up and down while being adjusted, it might just need a cleaning. You could do it yourself very easily with can of television tuner cleaner, available at any Radio Shack. It's as simple as removing the knob, spraying some into the pot at the base and twisting the knob back and forth a few times. Might take more than one application. In the end, you'll have a fully functional pre again. That's a good one worth saving.
The afore mentioned Adcom was the GFA-535L and is a great suggestion. Quite musical compared to the other Adcom amps of it's vintage.
The afore mentioned Adcom was the GFA-535L and is a great suggestion. Quite musical compared to the other Adcom amps of it's vintage.