Ok but practically to keep tube preamp options open it’s much safer to go with an amp explicitly designed to handle that which spec wise means higher input impedance than 10kohm more like 60-100kohm typically with most products I have seen.
Bel Canto ref amps are a good example. Older models with stock Icepower modules only had 10k input impedance and users with tube preamps reported poor results. Newer models since cost more but added custom input section with 100kohm unbalanced input impedance. Those like the ref1000m amps I use with ARC tube pre-amp are a match made in heaven.
Bel Canto ref amps are a good example. Older models with stock Icepower modules only had 10k input impedance and users with tube preamps reported poor results. Newer models since cost more but added custom input section with 100kohm unbalanced input impedance. Those like the ref1000m amps I use with ARC tube pre-amp are a match made in heaven.