Try finding an old Adcom SLC 505 passive preamp on eBay. The Adcom units of that time period were very well constructed. There is plenty of space "under the hood" to add any active electronics if you want an active/passive preamp combination. In fact there is a slide switch on the back of the unit that changes it from a passive preamp to an switchbox that could be adapted to switch from passive to active. The last one on eBay went for less that $40.00 here:
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