Usinf Bellset 31 for CB/auto in place of Bellset 37 - UK Vintage Radio Repair and Restoration Discussion Forum

Dave Moll · 23rd Jun 2022, 9:34 am

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?

dagskarlsen · 24th Jun 2022, 11:27 am

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.

Dave Moll · 25th Jun 2022, 7:08 pm

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

Dave Moll · 26th Jun 2022, 7:07 am

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

23rd Jun 2022, 9:34 am	#1
Dave Moll Dekatron Join Date: Feb 2005 Location: West Cumbria (CA13), UK Posts: 5,864	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? __________________ Mending is better than Ending (cf Brave New World by Aldous Huxley)

24th Jun 2022, 11:27 am	#2
dagskarlsen Heptode Join Date: Jan 2008 Location: Hakadal, Norway Posts: 611	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. Attached Thumbnails

25th Jun 2022, 7:08 pm	#3
Dave Moll Dekatron Join Date: Feb 2005 Location: West Cumbria (CA13), UK Posts: 5,864	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 __________________ Mending is better than Ending (cf Brave New World by Aldous Huxley)

26th Jun 2022, 7:07 am	#4
Dave Moll Dekatron Join Date: Feb 2005 Location: West Cumbria (CA13), UK Posts: 5,864	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. __________________ Mending is better than Ending (cf Brave New World by Aldous Huxley)