I'm late to the discussion, but I want to share my experience with installing an isolation transformer into my system. I have tube system consisting of class A mono blocks, phono preamp and line stage. Together all components draw about 5 amps from the wall. I am on a 15 amp dedicated circuit and have never had an issue of limited power or breaking the circuit breaker. I have a Furman P-2400 IT which is a 20 amp device, so I think it's sized properly for my system.
Like you, I live in a city with all kinds of noise, electrical, radio frequency, and environmental noise (traffic, sirens, subways, etc).
The affect is pure music. More of everything good, the noise floor is gone in the music. I am now hearing more detail, harmonic textures all the way down in the lowest bass registers. And dynamics, wow, I'm hearing dynamics like I have not heard before in my system.
I think there is a distinction between a power conditioner and an isolation transformer. I can say with very positive results in my system, the isolation transformer will not have any negative downsides, only positive benefits to a very large degree depending on the resolution of your system.
Like you, I live in a city with all kinds of noise, electrical, radio frequency, and environmental noise (traffic, sirens, subways, etc).
The affect is pure music. More of everything good, the noise floor is gone in the music. I am now hearing more detail, harmonic textures all the way down in the lowest bass registers. And dynamics, wow, I'm hearing dynamics like I have not heard before in my system.
I think there is a distinction between a power conditioner and an isolation transformer. I can say with very positive results in my system, the isolation transformer will not have any negative downsides, only positive benefits to a very large degree depending on the resolution of your system.