2. amps-preamps
  3. 148094-80275

Isolation Transformers

I bought an isolation transformer from a fellow selling his home audio gear about a year or so ago. It’s a 12” cube that weighs roughly 60 lbs and has 8 plugs in the back. It was apparently used in a hospital. 
I have most of my gear including a tube preamp plugged into it mostly for protection purposes. It puts out a constant 124v which is a few more than what I get directly from the wall socket.
Anyone else using this sort of device as a “power conditioner” and what are the pros and cons of using one? I’m guessing delivering a constant voltage (almost) regardless of the load is the main advantage of this type of device but am wondering if it impedes full current delivery at high amplifier loads. Thanks. 
128x128kalali
atmasphere's avatar
atmasphere
11,740 posts
 
I am only concerned with front end equipment isolation i.e. low power requirement.
@testpilot ,
Why? From what are you wanting to isolate?
testpilot
909 posts
 
I want to isolate both my pre and phono stage from the main lines to reduce noise etc. On occasions, I also get a ground loop issue.  I run large power hungry mono block amp and I don't want to go the large transformer route. 
erik_squires
16,004 posts
 
Hi Test Pilot,
The usual thinking is to use isolation transformers, but the owner of Jensen Transformers wrote an article about how this doesn’t really work. Your best safest bet are the semi-active ground lifters, assuming you have any issues at all.

Best,
E
testpilot
909 posts
 
Thanks Eric, could you expand on the semi-active ground lifter comment. 
erik_squires
16,004 posts
 
I'm thinking of this:
https://amzn.to/2Z7qun3

$80 seems pricey though, see if you can find a cheaper version.

But now that I think about it, Jensen Transformers also makes in-line RCA or XLR isolators as well. 
Best,
E
More to discover