where can you get good step attenuators ?

I am looking into making a passive preamp ,who makes good step attenuators and which is best SMD resistors or standard ones?

how about 24-step Ladder Type VR kits with knob and 96 1% Vishay Dale RN60D resistor
The TKD stepped attenuator is very good. Percy Audio has them. Steve McCormack uses it in his upgrade of the TLC-1 passive preamp.
Electronic Visionary Systems at: www.tweakaudio.com hand makes great attenuators. I have used a pair for about a year on my system. Check out the website or do a search here for "EVS attenuators" to find out more. Check them out.