That's great information, thanks!
Regards,
Dennis O.
In a message dated 10/3/03 12:12:35 AM Central Daylight Time, gbadger@att.net
writes:
> The 4662 will replace the 8122 exactly. When I was with Svetlana we
> retrofitted an ncl2000 with 4cx400a's. The retrofit was straitforwad and it
> worked
> well. We chose the 4cx400a for marketing reasons but the 4cx250b would have
> been a much better choice from a technical point of view beacause the 4cx400a
> requires jockeying parts around and cutting hard steel to move the sockets.
> OTOH the 4cx250b and socket drops in place easily and few parts need to be
> moved. Don't worry about the ratings because the cathodes and grids in all
> these tubes are about the same size. The 8122 and 4662 grid material is soft
> copper and the others have molly grids which are therefore stronger. The
> 4cx250b
> anode size is the same as the 8122 so it is capable of tha same dissipation.
> and fits in the amplifier with ease. The formal ratings for the 4cx250b are
> less than the 8122 but it is more rugged because of the grid material.
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