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Old 2nd February 2012, 02:33 PM   #1
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Default Single ended 300b's

I am puzzled, I have three amps, an AN Kit1 (8 wpc,) AN Conquests (18 wpc,) and Audion Golden Nights (10 wpc,) I have recently played them all through a passive pre-amp and to my amazement the Audion's were way the loudest at a given volume setting, next came the Conquests and finally the Kit 1. This makes no sense to me, does any one have a theory? I should add I played them all through the same speakers, Woden Vulcans with Fostex 206e's.
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Old 2nd February 2012, 02:37 PM   #2
Doz is offline Doz  United Kingdom
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Input impedance?
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Old 2nd February 2012, 03:08 PM   #3
jrenkin is offline jrenkin  United States
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Are those claimed or measured watts ?
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Old 2nd February 2012, 03:34 PM   #4
Alex M is offline Alex M  United Kingdom
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Doesn't the output level depend on the gain of the input and driver circuitry, for a start? Also (to a lesser extent, since all amps use the same output valves) on the OPT ratio.

Alex
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Old 2nd February 2012, 03:35 PM   #5
zelgall is offline zelgall  Canada
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It's the difference in input sensitivity. One amp may need 1volt for full output and another needs 2 volts for full output. As an example, I have a Leak stereo 20 that is rated at about 11 watts but only needs about .5 volts for full output and a homebrew 300b that I designed for a 5 volt input because of the preamp I was using. With the Leak a very small turn of the volume knob would be extremely loud and at the same setting, the 300b would at very low volume.
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Old 2nd February 2012, 04:27 PM   #6
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If the louder amps have more gain than needed, you might be able to get better bandwidth, lower noise, or lower distortion by changing some component values.
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