Balanced power for mains has been known for ages and it brings tremendous improvement to the sound of many audio setups, especially with our Level 3 Ultra Isolation Transformers or Level 3 Ultra Isolation Power Transformers custom made for audio amplifiers.
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| Balanced LV filament winding |
Take a look at the above schematic. What can you see different from the ordinary tube amplifier schematic with tube rectifier design? Yes, the filament winding as a center-tap and is balanced.
Since we manufacture a lot of custom made power transformers, we do not see the the common usage of balanced filament windings for tube rectifier filament supply. It is quote common for the B+ / HT supplies, but not the LV filament supplies. LV filament supply is often quoted as 5Vac or 6.3Vac, but not as 5VCT or 6.3VCT with a center-tap, which is also a balanced winding?
Why not? Since it is custom made power transformers, one should consider balanced LV filament windings as well to gain all the benefits of balanced winding and the noise cancellation/immunity properties it brings.
Till then. Take care everyone!
J&K Audio Design
1/5/2022