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RE: Ready to get my feet wet with OTL magic.... looking for a schemtic or 2

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In Reply to: RE: Ready to get my feet wet with OTL magic.... looking for a schemtic or 2 posted by Jeff Davison on June 22, 2012 at 00:13:57

If you want to try something wild and wooly, try Steve (Stephie) Bench's single ended OTL with the output tubes in inverted mode. I provided a link to the Web site for the schematics below. You would have one of the only in the world, and I bet it sounds really great too! I have not built it, but I intend to someday (I have 15 ohm Lowthers, a perfect match). I believe that it only draws about 150 watts per side - a modest energy draw.

http://diyaudioprojects.com/mirror/members.aol.com/sbench102/PowerAmps/se_otl.gif

You can look on Bench's webpages for more information about how this was pulled together.

Retsel

Follow Ups:

RE: Ready to get my feet wet with OTL magic.... looking for a schemtic or 2 - Ralph 13:00:24 07/02/12 (1)
You need a lot of these tubes to make only a small amount of power. You could get more power from a single 6AS7G! I've never figured out what the advantage is. Have you heard one?
- RE: Ready to get my feet wet with OTL magic.... looking for a schemtic or 2 - Retsel 14:22:21 07/02/12 (0)
  I haven not heard one, but Bench said that it sounds very, very good. Having seen the quality of Bench's designs over time and hearing Bench's very high regard for this design, I trust that this design would sound very good. The advantage of this design is using the tube in single ended operation while it is in its inverted mode, resulting in a very linear tube curve. Linear tube curves, of course, means very low distortion. The other advantage is very low power draw for the amp. As you point out, you would need efficient speakers for this amp to qualify, or a lot of output tubes (which are not expensive).
  
  Bench went out of the way to avoid any iron, but I would think hard about using very high quality interstage transformers versus the coupling caps shown in this design.

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