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Old 23rd Jun 2022, 9:34 am   #1
Dave Moll
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Default Usinf Bellset 31 for CB/auto in place of Bellset 37

Thanks to forum member PMMunro, I have recently acquired a pendant telephone 246, along with a bellset 31. The latter is designed for use with a local battery for magneto, CBS or a long line on CB/auto.

Is it possible to rewire the bellset 31 to behave like a bellset 37, i.e. without the use of a local battery?
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Old 24th Jun 2022, 11:27 am   #2
dagskarlsen
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Default Re: Usinf Bellset 31 for CB/auto in place of Bellset 37

No, and yes. You have much more experience with British telephones than me, but I' believe that it will work with this circuit, but no anti sidetone circuit.
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Old 25th Jun 2022, 7:08 pm   #3
Dave Moll
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Default Re: Usinf Bellset 31 for CB/auto in place of Bellset 37

In the end I have wired it as a "long line CB/auto", with the transmitter energised by a local battery, as follows:

T1 -> B1
T2 -> B9 -> T6
T5 -> B3 -> T8
T7 -> B4 -> Batt+
T9 -> B2 -> T10 (via dial if present)
Batt- -> B5
A leg -> B6/B7
B leg -> B8
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Old 26th Jun 2022, 7:07 am   #4
Dave Moll
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Default Re: Usinf Bellset 31 for CB/auto in place of Bellset 37

For completeness, I should have included that T3 and T4 are strapped internally.
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