"John T. M. Lyles" wrote:
> The X2159/8974 tetrode is certainly
> a higher output power device, but is best for VLF and MW
> transmitters. The Saudi's used them for a megawatt or two at one
> time, I was told. But then they got the Harris solid state megawatt
> rigs, with many transistors.
>
> A year or so back, the VOA reduced the usage of 4CM300,000G or GA so
> a lot of these tubes might be on the surplus market. These are
> similar to the Thomson TH537. They were PDM modulators, now replaced
> by solid state devices, in a massive retrofit by the manufacturer.
For those mining coal and pumping steam, these references to solid state
megawatt devices are best ignored....
Ian ZS6BTE
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