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, the same year as my I-177, 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 makes the I-177 more versatile, 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 of the I-177. 
There's no electronics inside this unit, just wiring from the tube sockets and octal adapter cable that go 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.
Page created 9/1/2017
Last updated 4/12/2021
Last updated 4/12/2021
