Lightspeed is around 10kohm Grannyring, it mimics similar parameters as a 10kohm logarithmic potentiometer. So sources feeding it should be less than <1kohm, as I believe in the >10-1 ratio rule.
And as for a tube amp and the Job not liking each other, it's not that they don't like each other it's the fact that there is too much gain, massive in fact, as Devilboy said way back about the Job "IMO, the 225's specs SCREAM passive" You be nutz to put a preamp with it that has gain.
Remember what Nelson Pass said, (and he designs and sells active
preamps.)
Nelson
Pass,
We’ve
got lots of gain in our electronics. More gain than some of us need or want. At
least 10 db more.
Think
of it this way: If you are running your volume control down around 9 o’clock,
you are actually throwing away signal level so that a subsequent gain
stage can make it back up.
Routinely
DIYers opt to make themselves a “passive preamp” - just an input selector and a
volume control.
What
could be better? Hardly any noise or distortion added by these simple passive
parts. No feedback, no worrying about what type of capacitors – just musical
perfection.
And
yet there are guys out there who don’t care for the result. “It sucks the
life out of the music”, is a commonly heard refrain (really - I’m being
serious here!). Maybe they are reacting psychologically to the need to turn the
volume control up compared to an active preamp.
Cheers George
