| Re: Tubes from Russia [message #99907 is a reply to message #99838] |
Mon, 09 November 2026 01:15  |
positron
Messages: 165
Registered: May 2020
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Master |
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I have heard from others concerning problems with stability,
tubes cheery and/or arcing of russian output tubes. I
experienced problems myself near higher rated plate
dissipation levels.
I did some checking and found that the 1 grid is not gold
plated on some/many russian output tubes, so possible
thermal runaway problems can rise.
But even more important, the rods holding the grids (esp #2)
are aluminum, not copper. Excessive heating will cause aluminum
to warp, thus the dissipation of both plate and screen grid
needs to be limited. I am running 29 watts plate dissipation,
and no problems so far concerning run away etc.
Hope this helps in understanding the problems concerning
stability and ratings with at least some russian output
tubes.
pos
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