[R-390] Tube extenders

[Perry Sandeen]

GM List,

One of the useful items for R390A maintenance is a tube extender.  Unfortunately, they rarely show
up on epay and when they do they tend to get very pricey.

In compiling info for the Y3K manual I ran across a nifty adapter in the Army manual TM 11-856A as
"figure  54. Fabrication of tube test point adapters." 

It is both simple, clever and cheap.  You use two matching 7 or 9 pin tube sockets.  The bottom
one is turned upside down with the #18 gauge wire threaded thorough the tube pin holes as well as
being soldered to the socket tabs.

The manual is available from the R390 site.  If one doesn’t have a copy of this I recommend you
D/L it.  There are several improvements to what is in the Navy Y2K version in regards to AGC
circuit info as well as test jigs and two pages on the color codes used on the resistors and
capacitors.  Also some very nice B/W pictures of many modules.

I don’t have a web site but will email a TIFF image to anyone who wants it for personal use or to
post it.
It’s also going to be added in the additional chapters of Y3K along with other test jigs from the
manual.

Regards,

Perrier



       
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