Just picked up an Emerson 600/639 Electrostatic

[mbates14]

I know you cant use ceramics. The fact that ceramic caps have a property that causes the capacitance to change over a given applied voltage range makes it undesirable at best.

Thanks for the link, I had totally forgotten about justradios. Thats where I used to order my Sams and Cap Kits back when I was in high school.

[old_coot88]

Might wanta verify that the HV supply is healthy before delving in too deeply.