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cuallito 15th April 2004 04:22 AM

really basic question
 
What does OTL stand for and what makes an OTL different from a normal amp? And I did do a search here and on google.

Steve Eddy 15th April 2004 04:30 AM

Re: really basic question
 
Quote:

Originally posted by cuallito
What does OTL stand for and what makes an OTL different from a normal amp? And I did do a search here and on google.
(O)utput (T)ransformer(L)ess. They're different from normal TUBE amps (and some McIntosh solid state amps) in that they don't use an output transformer.

se

SY 15th April 2004 04:32 AM

OTL = "Output transformerless" and means just what it says; the output stage is either direct coupled to the load or coupled through a capacitor. In either case, it's done without the benefit (and detriment) of an output transformer acting like a transmission in a car.

The virtues and drawbacks of the approach are many, but in general, they're most suitable for high impedance loads.

ray_moth 15th April 2004 04:36 AM

It stands for "Output-Transformer-Less". OTL is different from a normal tube amplifier in that it drives the speaker directly, without an intermediate output transformer, like a transistor amplifier.

Rgds, Ray

cuallito 15th April 2004 06:37 PM

thanks, that's kind of what I gathered. What's considered a "high impedance" load anyway?

ErikdeBest 15th April 2004 06:43 PM

High impedance
 
The input of an amplifier (tube or SS) is high impedance. Thatīs why most pre-ampīs are OTL. Some headphones are also high impedance (300 ohms), allowing the use of an OTL hedphone amp. (Look at www.headwize.com, almost al headphone amps are OTL)

Low impedance are nowadays speakers.

planet10 15th April 2004 08:25 PM

Quote:

Originally posted by cuallito
thanks, that's kind of what I gathered. What's considered a "high impedance" load anyway?
In today's world 16 ohms or higher ... Philips for awhile built 800 ohm speakers and mated them with OTLs.

dave


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