Tweakers' Asylum

Hammond 193 Choke V Primary of Isolation Tranny

69.113.2.43

JerryG

Is the primary of my Topaz isolation transformer going to function at all like the Hammond 193 choke AC line tweak?
Jerry G

Follow Ups:

Can you measure its frequency response? - Al Sekela 16:58:17 07/08/07 (1)
Power transformers are designed to work at 50 or 60 Hz, but should have frequency response up to as much as 100 KHz. This means they have low leakage inductance of the primary winding.

The Hammond chokes have maximum impedance at about 5 KHz. This is because they are all about inductance. Their purpose is to filter the DC for tube amp B+ supplies. Their rated inductance is at a specified DC current, and they will exhibit higher inductance at lower DC current. Any DC current through a power transformer will saturate it and it will buzz loudly or burn up.

If your Topaz device has a roll-off of the primary winding impedance in the audio band, then it will likely offer some of the same benefits as the Hammond chokes. If it has a wider bandwidth, then it will give less benefit.

What it will do is protect the secondary from line spikes. You can experiment with R-C networks on the secondary without restricting the capacitors to X- or Y-rated devices for safety.
- RE: Can you measure its frequency response? - JerryG 19:09:55 07/09/07 (0)
  I don't have equipment to measure the frequency response....but I didn't hear any difference with it plugged in for over an hour, which might be an under dose....I thought that there was a bit of buzzing in a Risch type power cleaner (CMC chokes and capacitors) in parallel at another outlet when it was plugged in.....
  thanks for your input
  Jerry
RE: Hammond 193 Choke V Primary of Isolation Tranny - audionutge@yahoo.com 20:11:17 07/07/07 (2)
No.

Alan
- How about.... - ABliss 07:40:04 07/08/07 (1)
  Audioprism Quiet Line wall warts, or PS Audio Harvester, do they do the same thing?
  - RE: How about.... - audionutge@yahoo.com 10:03:38 07/08/07 (0)
    No...and neither do my PE's....all of these designs are considered parallel capacitance filters. Each does something a little different, but the basic concept is the same.
    
    Alan

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