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Audio transformer : digging into details – ESL 57 world
http://esl.drakkapps.com/?page_id=322
Audio transformer : digging into details. Audio input transformer is a step-up kind with ratios of 90 for treble and 270 for bass (quote from quadesl.com). Maximum voltage at treble side should remain far below 3kV, which can be forced by an optional clipping board that clamps at 2200V. This 3kV corresponds to about 33V at input side.
Audio transformer: check & protect – ESL 57 world
https://esl.drakkapps.com/?page_id=119
Audio transformer: check & protect First of all, identify serie 1 or 2. Serie 2 started at serial number 16800 and adds filtering, which is essential to use the ESL with a Quad 303 or any other audio amplifier featuring more than 15W.
Quad ESL57 and ESL63 transformer details. - rec.audio.tubes
https://rec.audio.tubes.narkive.com/QEKY7sf8/quad-esl57-and-esl63-transformer-details
audio to reach full output. The Quad ESL63 has a bias voltage of 5.2 kV on the panels and requires 16 kV p-p of audio to reach full output. To achieve this feat: The ESL57 uses a single, modest size, C-core transformer to provide the two levels of audio drive. The ESL63 uses a pair of modest size, C- core transformers to provide the audio drive ...
The Hub: QUAD ESL-57, Some good things last a lifetime.
https://forum.audiogon.com/discussions/the-hub-quad-esl-57-some-good-things-last-a-lifetime
In the QUAD ESL-57, the speaker utilizes a step-up transformer to couple output of an amplifier to the plates. Unlike many ESLs, the QUAD is not a "one-way" design, but has a tweeter panel surrounded by woofer panels on its left and right. This gives the ESL-57 limited dispersion, creating a tightly-focused "sweet-spot".
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