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Valve Jr. Power output Options
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cowgard
#1 Posted : Saturday, November 07, 2009 12:15:28 PM
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Joined: 5/27/2009
Posts: 12
Location: Arizona
Often amplifier specs say so many watts at 8 ohms and so many more at 4 ohms ect. Does the VJ head put out more power to an 8 or 4 ohm cab than it does to the 16 ohm cab? Just wondering. Thanks, David
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paruwi6172
#2 Posted : Saturday, November 07, 2009 12:27:02 PM
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Joined: 1/2/2009
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Location: Beautiful South of Germany
cowgard wrote:
Often amplifier specs say so many watts at 8 ohms and so many more at 4 ohms ect. Does the VJ head put out more power to an 8 or 4 ohm cab than it does to the 16 ohm cab? Just wondering. Thanks, David


It's always the same watts on tube amps AFAIK

SS-amps mostly get their full power at 4Ohms

So for example a standalone Combo with the built in 8Ohm speaker produces 100Watts
and with an ext. 8Ohm cab this amp now has full power 150Watt at (together) 4 Ohms

If I'm not right the "Amp-gurus" will describe it betterWhistle

Peter
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I don't have any reason to lie to you - I just do it for fun
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Epi - B.B.King Lucille | DR200CE || BH - Handsome Combo || VOX - ToneLab-LE | DA5
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jwalin
#3 Posted : Saturday, November 07, 2009 2:06:41 PM
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Joined: 4/15/2009
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Location: Evansville, IN
tube amps put out LESS power when the wrong impedance is used. you need to match the speaker to the impedance of the output transformer because this is directly related to the impedance of the power tubes and the primary side of the output transformer. if you have multiple taps for different impedances on a tube amp, only then should you run other cabinets of different impedances.

SS amps are different, they put out more power into lower impedances, until they run out of power and current capability. then they blow up or shut down.
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cowgard
#4 Posted : Saturday, November 07, 2009 4:46:55 PM
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Joined: 5/27/2009
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Location: Arizona
Cool. Thanks guys. I ordered a second VJ cabinet to daisy chain and was just curious if the lower impedence meant more power. So I guess I just plug 'em into the 8 ohm output (I made a splitter cable for this purpose) and get a total of 5 watts power. I've read that some have powered up to four 12" speakers with a VJ with good results. Once again thanks for the info. David
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