[Boatanchors] compairson of 5R4 tubes

[Bry Carling]

5R4GY seems ruggedized.
Larger base & thick glass...

John King <k5pgw at yahoo.com> wrote:

>I note that there are various 5R4 tubes with different letters after
>the  5R4, which I suspect refers to the bulb shape, height or other
>style designations. I am going to order a number of 5R4 tubes for older
>transmitters such as DX 100s and early Viking transmitters. Is there
>any difference other than style between the various 5R4 tube versions?
>Some versions are significantly cheaper than other versions. What are
>your thoughts regarding the best bang for the buck for these old
>boatanchor transmitters? Thanks and 73, John, K5PGW
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regards,
Bry Carling

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