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Old 6th March 2002, 10:07 PM   #11
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Paul, thanks for the links.
There are three basic OTL topologies that I am aware of:

Single Ended OTL: Good old days when high impedance speaker loads were common. This is my preferred option. However this is not practical with the majority of speakers available today.

Futterman: Where the cathode of the driver tube is connected to the output. Simple and very effective concept.

Circlotron: Two current paths.

Modern topologies are all variations of the two latter types where feedback is a necessity. Hence my reservations. The only exception is Steve Bench’s Inverted Tube Amp that requires a large number of tubes.

Returning to the main discussion topic, perhaps Dave could enlighten us a bit more on his concepts of an input transformer for ESLs. What should the secondary current be at peak output?

Dave, are you planning to construct a single panel OTL or multiple full range panels? Just curious!

Mohan
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Old 7th March 2002, 09:20 AM   #12
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Quote:
Originally posted by Mohan Varkey
Returning to the main discussion topic, perhaps Dave could enlighten us a bit more on his concepts of an input transformer for ESLs. What should the secondary current be at peak output?

Dave, are you planning to construct a single panel OTL or multiple full range panels? Just curious!
The ESLs are just concepts at the moment -- and not mine (i'll just supply the venue). The idea is to take an amp that can swing significant voltage -- say 300 or 500 volts and then step it up 1:10 to get the 3-5k volts needed for the ESLs. Beyond that i can't tell you much more -- i sat over coffee as Bill & Menno talked this over, and i understood about 10% of what they said -- these two guys know a lot about transformers.

The panels will be mostly full-range (150 Hz & up) of easily manufactured size and stacked to produce a large line array (20-30 ft tall). As frequency goes up the driven panel will get narrower.

There are many things that need to fall into place before we can start prototyping.

dave
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Old 7th March 2002, 11:54 AM   #13
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Thanks Dave.

Mohan
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