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    Building, troubleshooting and testing of these amplifiers should only be
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7W enough for 90dB speakers?

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I am using a 6080/6as7 parafeed (less than 3 watts) into a Fostex 127e (91db), and it is LOUD.

I am also driving my Fostex with my SE KT88/EL34 based on Mikael's circuit, and that is LOUDER (around 6 watts on triode and less than 12 watts on ultralinear, have not measured the power though).

I also have a 0.9 watt 12b4 parafeed and it is enough to power my Fostex, but it does not go very loud.
 
I brought my 300B 8W monos to my friend's house for comparison with his Bi-amp (Phase Linear 200W per channel Solid STates) system.

My 300B is loud enough to drive his JBL 3 way speakers with 12" woofer.

I would say that my 8W has sufficient loudness for me.... Of course, you need an amplifier which has good frequency response from 20 to 20kHz.


Johnny
 
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