In Reply to: Power transformer for stereo 211 PP posted by howardyu on November 6, 2015 at 00:11:13:
If you are planning a cap-input filter, the rms current will be around twice the DC, so more like 386 V-A for the HV windings.
If you are having a custom transformer made, you might want to hold the magnetic induction to a lower value than the standard 16kgauss; this will reduce the core losses, radiated magnetic hum field, and vibration. You can ask for a 50/60Hz design which will be around 13kgauss at 60Hz. Personally I like to go lower, 10 kgauss or less. IIRC, Marantz ran at 8kgauss. In any case, make sure they understand this is for an audio amplifier, where hum pickup is a concern.
Between these two effects, the transformer would be quite a bit larger.
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Follow Ups
- RE: Power transformer for stereo 211 PP - Paul Joppa 09:31:27 11/06/15 (1)
- RE: Power transformer for stereo 211 PP - howardyu 19:33:27 11/08/15 (0)