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-   -   piezo amp discussion on loudspeaker forum (http://www.diyaudio.com/forums/tubes-valves/116645-piezo-amp-discussion-loudspeaker-forum.html)

mashaffer 2nd February 2008 05:40 AM

piezo amp discussion on loudspeaker forum
 
Over in the loudspeakers forum a discussion is just beginning on a dedicated amp for Piezo tweeters. Given the rather different natural impedance (i.e. without external components like resistors) one wonders what could be done with tubes. OTL with great big resistor across the speaker? Makes me go hmmm....

mike

EC8010 2nd February 2008 09:28 AM

Re: piezo amp discussion on loudspeaker forum
 
Quote:

Originally posted by mashaffer
OTL with great big resistor across the speaker?
Yes, an OTL would do very nicely indeed. Ideal, in fact, no resistor needed; 6C45 would do nicely as output valves.

Eli Duttman 2nd February 2008 02:09 PM

Guys,

94 dB. seems to be a common sensitivity for piezo tweeters. 2 W. should be distressingly loud, at the freq. range tweeters operate in.

How about an ECC99 wired as a LTP. Just place the piezo tweeter between the 2 anodes. The tweeter is self coupling and no caps. are needed.


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