MX-949A/U Tube Socket Adapter Kit for the I-177

This is a "breakout' box that adds additional tube sockets to the I-177 tester. These can be a bit hard to find, but I stumbled across this one online and bought it before it could get away. It's dated 1953 and is in good condition except for the ceramic tube socket.  

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The original paint only has a few minor dings and chips, not enough to justify repainting it. All it really needed was a good cleaning.

It's just what I need for the I-177 although there are still some newer tubes that can't or shouldn't be tested on the combo because of the 5-volt grid signal used by the I-177.

​There's no electronics inside this unit, just wiring from the tube sockets and octal adapter cable going to the numbered pins and jacks of the front panel.

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The ceramic tube socket was cracked, which seems to be a common malady with these units, probably from over-tightening the mounting screws. I epoxied it back together and filled the cracks with a porcelain filler for appliances. 

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Last update 9/28/2017