Single ended 300b's

doubtingthomas · 2nd February 2012, 02:33 PM

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.

Doz · 2nd February 2012, 02:37 PM

Input impedance?

jrenkin · 2nd February 2012, 03:08 PM

Are those claimed or measured watts ?

Alex M · 2nd February 2012, 03:34 PM

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

zelgall · 2nd February 2012, 03:35 PM

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.

riccoryder · 2nd February 2012, 04:27 PM

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.

2nd February 2012, 02:33 PM	#1
doubtingthomas diyAudio Member Join Date: Aug 2011	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.

2nd February 2012, 02:37 PM	#2
Doz diyAudio Member Join Date: Jul 2010 Location: Sat Down	Input impedance? __________________ "To err is human.. to make a real balls-up requires a computer"

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2nd February 2012, 03:08 PM	#3
jrenkin diyAudio Member Join Date: Nov 2007 Location: Denver, Colorado	Are those claimed or measured watts ?

2nd February 2012, 03:34 PM	#4
Alex M diyAudio Member Join Date: Apr 2001 Location: Hampshire, UK	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

2nd February 2012, 03:35 PM	#5
zelgall diyAudio Member Join Date: Aug 2005	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.

2nd February 2012, 04:27 PM	#6
riccoryder diyAudio Member Join Date: Dec 2011	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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