I came across Philips VR37 resistors, which have 3500V dc working voltage rating. 0.5W dissipation at 70C. Farnell catalogue here has a range 1.2 to 33M at 16p/20c each. Steve -- FAQ on WWW: http://www.contesting.com/ampfaq.html Submissions: amps@contesting.com Administrative requests: amps-REQUEST@contesting.com Problems: owner-amps@contesting.com Search: http://www.contesting.com/km9p/search.htm