A recent post by Leigh, VK5KLT, suggested: > ... a soft-start mechanism on > the filaments to bring them up slowly in a controlled > manner at initial switch-on ... One method for this is found on page 8 of: A Luxury Linear, QEX, May, 1996, 3-12. http://www.zianet.com/k5am/2mkw.pdf 73, Mark, K5AM