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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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In Reply to: Hammond 193 Choke V Primary of Isolation Tranny posted by JerryG on July 7, 2007 at 20:06:33:
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.
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Follow Ups
- Can you measure its frequency response? - Al Sekela 16:58:17 07/08/07 (1)
- RE: Can you measure its frequency response? - JerryG 19:09:55 07/09/07 (0)
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