Panel meter insulation

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Brad Huff" <huffb-at-avalon-dot-net> 

Does anyone know the insulation ratings of the quality panel meters that 
were built in the 40's through the 60's(weston, simpson, westinghouse 
etc.). These will be used for vttc service. Most people use one between the 
cathode and ground which reads plate and grid current. I would like to use 
one in the plate circuit if the meter is insulated to withstand plate 
voltage for the 833-A. Any thoughts?