Emission Labs 300B-XLS Schematics

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Description

Here are some schematics with the 300B-XLS tubes are listed. This tube behaves like any normal 300B tube, if biased as such. So that is one first application, and many use it like this, for the more dynamic sound. This is due to the slightly heater current, compared to the standard 300B. (Read the Tung-Sol 5751 data sheet for similar explanation for the 5751 tube, compared to 12AX7)

A second application, also used many times, is using the 300B-XLS at higher dissipation. This allows the use of medium efficiency loudspeakers beginning at 86dB, and the sound stays fresh and lively. Unlike standard 300B would not have the dynamic power any more for such speakers. (Standard 300B requires appr 89dB speakers or better). It's a bit personal, how many dB a speaker would need a s a minimum, but why choose the tube such that you have the minimum (?!). Sure is, 300B-XLS will can 3dB more with the right schematic.

Here are some examples of schematics:

  1. New! 300B-XLS 'Blade' By Dipl. Ing Leven from Germany. Contact via tube forum.
  2. 300B-XLS 'Merkur' . By Dipl. Ing Leven from Germany.
  3. 300B-XLS 'SE'. By Dipl. Ing Leven from Germany.
  4. Also check here for other Leven circuits (other than 300B-XLS)