‘Tubes’ Category

Marathon MX-280 Globe tube MESH PLATE

Here is a rare tube — a Marathon MX-280 Globe #80 rectifier tube featuring MESH PLATES construction!  Not only that, but each section tests very strong Emission, comparable to an NOS #80!

Mesh Plate Marathon MX-280 Globe rectifier tube

In 18 years of collecting, I do not remember ever seeing another Mesh Plates #80 tube.  Look at that Glow!  You can see right through the Mesh Plates into the filament!

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Identifying NATIONAL UNION tubes

This article provides examples of NATIONAL UNION-manufactured tubes.

NATIONAL UNION was another quality USA tube manufacturer with most production dating from 1930s to 1950s. Their production numbers were significantly smaller than the big name brands (RCA, Sylvania, GE).

The NATIONAL UNION (EIA) code number is “247″. Here is an example:

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Identifying RAYTHEON tubes

This post provides examples of Raytheon manufactured tubes.

Raytheon was an extremely high quality USA tube manufacturer with prolific output, covering both civilian issue and a vast majority of US Military parts production. The Raytheon (EIA) code number is “280″.

Here is an example:

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Identifying GE (KEN-RAD) manufactured tubes

This article provides examples of GE (KEN-RAD) manufactured tubes.

GE was one of the most prolific tube manufacturers in US history, and many companies sold GE tubes repackaged under their own brand name. The GE factory EIA code number is “188″ and proves GE was the true manufacturer, although there are a few rare exceptions to the “188” rule.  Here are several examples:

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Identifying RCA-manufactured tubes

This article provides examples of RCA-manufactured tubes.

RCA is probably the most famous tube manufacturer in US history, and many other companies sold RCA tubes repackaged under their own brand name. The RCA (EIA) code number is “274″ and proves RCA was the true manufacturer. Here are several examples:

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