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[[Thor Hallen]] designed the main vertical amplifier and the [[7A19]] plugin (Note 1). | [[Thor Hallen]] designed the main vertical amplifier and the [[7A19]] plugin (Note 1). | ||
It used bridged T coils and the "[[ | It used bridged T coils and the "[[ft doubler|f<sub>t</sub> doubler]]" circuit patented by [[Carl Battjes]] to achieve its bandwidth. | ||
The 7904 makes extensive use of custom integrated circuits and hybrid circuits, inter alia, the [[155-0064-00]] 470-ps output amplifier, | The 7904 makes extensive use of custom integrated circuits and hybrid circuits, inter alia, the [[155-0064-00]] 470-ps output amplifier, |