And vacuum tube equipment using indirectly-heated cathodes: http://www.cpii.com/docs/related/23/Basic%20Tube%20Design.pdf
"Operating techniques that are proper for filamentary tubes are not necessarily correct for tubes with indirectly heated cathode emitters. In particular, the opera- tion of cathode types at reduced heater voltage can be destructive to the tube."
Leigh. Mark Sims wrote:
Be very careful powering up modern equipment on variacs and with light bulbs in series, etc. You go through areas where the bias voltages, etc are in the right place to cause serious damage. Switching supplies can be particularly entertaining... ----------------------------------------
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