I looked up both tubes in Eimac's Care and feeding of Power Grid Tubes. I
was looking for the imd, as the 250 is a tad bit light. However, the 300
has exactly the same specifications, so there must be a lot in common,
despite the higher dissipation of the 300. The 300 has a more efficient
socket regarding cooling, and I suspect that is the major difference.
If you have sufficient spares and sockets, the 300 provides more
dissipation.
73, Colin K7FM
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