Subsitute Tubes for T-40 and TZ-40

[J. Dave Mayfield]

Don't think there is modern equivalent? But I can tell you that the CBS 
Hytron 5514 as I recall is the same thing. There is a pair on e-bay for 
sale right now 270512583104

Dave W9WRL.com or 3885am.com

Joe Crawford wrote:
> I have some transmitter designs using the above tubes, and wonder what a
> modern equivalent is for both tubes.
>                                                                 Joe
> W4AAB(new
> member)
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