4×150 and 4×250 old equivalent of 4cx250

By invalid@example.com (KA9UCN) 3 pc 4×150, 1 pc 4×250, 1pc socket These are the predecessor of the 4cx250 with 6 volt filament. All are 250 watt dissipation. They are from the estate of a SK. I have no way of testing them. They were all nicely packed together with the socket when …read more

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