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Old 19th Jan 2011, 12:44 am   #6
russell_w_b
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Location: Penrith, Cumbria, UK.
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Default Re: 232L bakelite telephone and No 26 Bellset

Quote:
Originally Posted by ivanidea View Post

On the link you gave me a rectifier was mentioned, which is new one to me.
Can you or anyone else cast any light on it?
Two back-to-back silicon diodes (Rectifier 205 in GPO parlance) can be connected across the receiver terminals as a clipper to prevent acoustic shock from transient clicks. Such a refinement isn't essential, but was fitted as standard on later instruments (746) with the more sensitive balanced armature receivers. A couple of 1N4001 or whatever will do, if you feel the need.
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