Anyone have/ordered the Job 225?

@grannyring 
i haven't used the Rothwells personally but have heard that they aren't the last word in transparency.  I can say that the LDR pre in my application was completely transparent, and enabled me to perfectly dial in the amount of attenuation needed, unlike the fixed in line units, such as the Rothwell.

I wonder what the input impedance of the Rothwell devices are as George makes a good point. I believe the input impedance of the LSA is 20k and that is not a good match for the output impedance of my tube preamp. 

???
What's the output impedance of your source?
Do you have any music that starts off VERY quiet and then SLOWLY increases in volume? I think it's Arthur Salvatore who calls it the "Bolero test". He connects a source directly into his amplifier and plays Bolero to see if a system can support a passive preamp.
*****BE CAREFUL!!! *****
Obviously volume is wide open here so make sure you stop the music before you do some damage.
I'm guessing your tube preamp and Job don't like each other.

I am sure my rig is passive friendly, but I really want to keep my self designed and built tube preamp. The output impedance of my preamp varies with the volume setting. I use a shunt style stepped attenuator made by Khozmo. I measured the output impedance over the volume range I listen to and it changes from 360 ohms to 1k ohms. According to George this may be to high for proper matching with the Rothwell attenuators.