Re: {Collins} Jan CNU 807 VT-100A National Union

National Union was a major supplier of 807 and 1625 tubes during World War II.  Usually, there is a date code printed on either the envelope or base of the tube.

Glen, K9STH 

    On Tuesday, May 21, 2019, 3:34:51 PM CDT, RADIO N5KX via Collins <collins@xxxxxxxxxxxxx> wrote:  
 I have one printed source indicating that these were made in 1943 but I
wonder if anyone out there knows exactly what years these particular 807s
were made. Thanks in advance.
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