I should add that I have narrowed the type(s) of tube(s) down to the 6AL5, 6BE6, 6AN5, 6AU6 or 4D32. Bill On Tue, Jul 27, 2021 at 2:22 PM Bill Degnan <billdegnan@gmail.com> wrote:

Hi,

Does anyone know which tubes from this list: https://www.vintagecomputer.net/temp/UnivacI/UNIVAC-1_tube-types%20.png

....Were installed on this module? https://www.vintagecomputer.net/temp/UnivacI/UNIVAC-1_A-35%20.png

They all appear to be the same type of tube. 7 pins and a center post.

(screenshots from a CHM video)

Thanks Bill

Link below If I remember correctly the tubes were set at a certain voltage to “fire”with a certain type of gas inside. https://www.radiomuseum.org/tubes/tube_5823.html Sent from: My extremely complicated, hand held electronic device.

On Jul 27, 2021, at 2:22 PM, Bill Degnan via vcf-midatlantic <vcf-midatlantic@lists.vcfed.org> wrote:

Hi,

Does anyone know which tubes from this list: https://www.vintagecomputer.net/temp/UnivacI/UNIVAC-1_tube-types%20.png

....Were installed on this module? https://www.vintagecomputer.net/temp/UnivacI/UNIVAC-1_A-35%20.png

They all appear to be the same type of tube. 7 pins and a center post.

(screenshots from a CHM video)

Thanks Bill