[AMRadio] Mfg date for 4-400 series

Barrie Smith barrie at centric.net
Sat Mar 24 14:32:47 EST 2007


Not too far into the transmitting volume I find the 4-65, which has 5 pages.
(Built a push-pull pair of these for 6M in the middle 1950s)

Next is the 4-125A, with 3 pages.

Next is the 4-250A, with 3 pages.

Next is the 4-400A, with one page.

Then comes the 4X500A, followed by the 4-1000A, which has three pages.

I have five volumes of the HB-3.  I have this particular book out at the
moment because I've been helping a local ham with a 160M 813 project.

73, Barrie, W7ALW

> Hi Barrie...
> In your HB-3, where exactly is the 4-400 data located?  I found mine in
> Transmitting volume and the other 4-tubes in last volume of the original
> set.  I was also surprised to find only one (1) sheet of data.  Is this
> consistent with your HB-3?
> Thanks,
> Rick/K5IZ
> I have an HB-3 here that shows a data sheet for the 4-400A dated 9-62.
> I also have an Eimac catalog from the early 1950s that shows the 4-400.
> 73, Barrie, W7ALW
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