View source for 874-X

{{GR Product
|model=1650-A
|codes=COAXHOPPER,0874-9990
|class=coaxial components
|summary=Coax insertion unit
|image=GR 874-X 1.jpg
|caption=Genrad 874-X Insertion Unit
|series=GR-874
|introduced=1954
|discontinued=1978+
|designers=
|manuals=
{{Catalog History}}
}}
The {{Title|General Radio 874-X}} is an "insertion unit" that allows custom parts or circuits to be built into it.

From the 1965 catalog:
<blockquote>
A hollow cylinder fitted with a GR874 Connector at each end and with a sleeve that slides back to provide
access to a space about 2 inches long and 9/16 inch in diameter. In this space can be mounted arrangements 
of small components such as resistors, capacitors, or inductors. The insertion unit can be used as a shielded
housing for impedance-matching networks, attenuator pads, VHF transformers, filters, and many other networks. 
It offers excellent shielding, minimal discontinuity in the line, and convenience.
</blockquote>