Home
AudioAsylum Trader
OTL Asylum

OTL, Output Transformerless Amplifier User Group.

For Sale Ads

FAQ / News / Events

 

Use this form to submit comments directly to the Asylum moderators for this forum. We're particularly interested in truly outstanding posts that might be added to our FAQs.

You may also use this form to provide feedback or to call attention to messages that may be in violation of our content rules.

You must login to use this feature.

Inmate Login


Login to access features only available to registered Asylum Inmates.
    By default, logging in will set a session cookie that disappears when you close your browser. Clicking on the 'Remember my Moniker & Password' below will cause a permanent 'Login Cookie' to be set.

Moniker/Username:

The Name that you picked or by default, your email.
Forgot Moniker?

 
 

Examples "Rapper", "Bob W", "joe@aol.com".

Password:    

Forgot Password?

 Remember my Moniker & Password ( What's this?)

If you don't have an Asylum Account, you can create one by clicking Here.

Our privacy policy can be reviewed by clicking Here.

Inmate Comments

From:  
Your Email:  
Subject:  

Message Comments

   

Original Message

Apples and oranges

Posted by Lew on January 13, 2005 at 08:24:24:

The "need" for an OTL amplifier is not related to a need for high power. In fact, OTL amps are in general relatively less efficient than transformer-coupled tube amps in converting the power available from an output tube into power that can drive a speaker. The beauty of an OTL amplifier is in the elimination of the output transformer entirely, which leads to lower distortion, wider bandwidth, greater transparency, etc. For your speakers (112db efficiency!!!) you want a low power amplifier with a very high signal-to-noise ratio. But you have not mentioned the nominal impedance rating of your speakers. If your speakers are rated at 8 ohms impedance or higher, and if the impedance curve is relatively flat with respect to frequency (real world impedance or resistance of a speaker varies with frequency), then you might find bliss with an OTL type. If your speakers are rated less than 8 ohms OR if there is a serious dip in impedance at critical frequencies (ultra-high frequencies don't count), then you might look elsewhere or consider an OTL in conjunction with an impedance matching device, such as a Zero autoformer.