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Old 2nd February 2008, 04:40 AM   #1
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Default 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....

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Old 2nd February 2008, 08:28 AM   #2
EC8010 is offline EC8010  United Kingdom
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Default Re: piezo amp discussion on loudspeaker forum

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.
The loudspeaker: The only commercial Hi-Fi item where a disproportionate part of the budget isn't spent on the box. And the one where it would make a difference...
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Old 2nd February 2008, 01:09 PM   #3
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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.
Eli D.
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