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Military I-177-B Tube Tester
by Triplett

 

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Military Mutual Conductance Tube tester
model 1-177-B ca: 1945

The I-177-B  is an excellent mutual; conductance tester for the older tubes typs. It will test all the consumer and military (except the larger transmitting types) tubes from the 1920's to around the mid 1960's with the exception of the 9 pin miniature based tubes (such as a 12AX7). It will not test the newer TV types that were introduced in the late 1960's & '70's like compactrons etc.

The MX-949/U adaptor is needed to test the 9 pin and some 7 pin miniature tubes.  I do not have the adaptor or know of a source. However, such an adaptor can easily be built by a technical person with soldering skills, some basic shop tools and common supplies such as tube sockets, wire etc. and a simple chassis box.
 

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  above and other models available
this instrument has been sold, photo reference only
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