"The addition of tone controls in your system will only compromise fidelity."
I would agree with the audio purest perspective that use of tone controls are better avoided, if possible, but sometimes it isn't for whatever reason and the advantages of adjustable settings and options can far outweigh the disadvantages compared to the alternatives.
If pre-amp flexibility is critical to your application, a properly functioning second hand Carver pre can likely do the trick without breaking the bank.
Would need more details about your system and setup to suggest how you might avoid this, if possible.
I would agree with the audio purest perspective that use of tone controls are better avoided, if possible, but sometimes it isn't for whatever reason and the advantages of adjustable settings and options can far outweigh the disadvantages compared to the alternatives.
If pre-amp flexibility is critical to your application, a properly functioning second hand Carver pre can likely do the trick without breaking the bank.
Would need more details about your system and setup to suggest how you might avoid this, if possible.