BELL UNIT No. 776 | ||||||||
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The Bell Unit No. 776 was used on the Telephone No. 776-1. The Bell Unit No. 776 has suitable terminations for drop wire in addition to terminations for internal cable, thus avoiding the need for a separate terminal block. Dimensions are less than existing bellsets, permitting the unit to be mounted within the majority of window alcoves, etc. It is a slide-on fit to a wall plate which can be screw fixed to a flat surface, conduit box, or with the addition of angle brackets to skirting boards or wooden window sills. The snap fit cover locks the bell unit to the wall plate. When used on Plan 4 installations it can be fitted with a jack into which can be plugged a portable telephone. It can be mounted within a wall bracket which also provides a secure shelf for a Telephone No. 776-1. When mounted within the wall bracket the bell unit can also be provided with a jack. The bell unit cover (Part 1/DCO/760) is a snap action fit to two sprung lugs formed on the bell unit base. The cover can be removed by inserting the tip of a small screw driver through the sound opening slots located at each end of the cover just sufficient to disengage the sprung lugs from the locking projections formed on the inside of the cover. The cover can then be lifted off the bell unit base. The bell unit base (Part 1/DBA/217) provides a mounting for a Bell No. 79A, a 1.8uf capacitor and an instrument cord anchor block (Part l/DBL/124) which is replaced by a Jack No. 139A when used on a Plan 4 installation. It contains two groups of terminals. One group has seven terminals on which are terminated either the telephone cord conductors or the Jack No. 139A leads. Six of these terminals are permanently connected to the other group of six terminals. All of the second group of terminals are for terminating internal cable and three are also suitable for terminating drop wire. The bell is fitted with a three position volume control (not fitted on very early Bellsets), operated by a lever which projects from under the bell unit cover, or lower front edge of the bracket telephone. The control is effected by mechanically impeding the travel of the bell hammer rod. The volume control lever is also used to provide the bell cut off facility. The volume control comprises of a Lever assembly D93647 fitted to a Latch Assembly D93571 . Drawings Specification - S1232.
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Last revised: May 27, 2023FM | ||||||||
