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Old 10th Jun 2020, 2:40 pm   #1
Sparks
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Default 706L telephone - extra gravity switch

This 1965 model arrived today. As well as having a recall button, there is another gravity switch on the opposite side to the usual one. However, it only has two wires - grey and blue - and these are wired in parallel with the grey and blue wires off the recall button. What might this switch be for please ? This switch is 'on' when the handset is on-hook. Thankyou.
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Old 10th Jun 2020, 4:37 pm   #2
JohnBHanson
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Default Re: 706L telephone - extra gravity switch

Possible for use with a pmbx 2 which use 4 wires
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Old 10th Jun 2020, 5:33 pm   #3
Sparks
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Default Re: 706L telephone - extra gravity switch

Thanks John. I'll probably end up converting the phone for regular use, in which case I'll leave the switch in but park the wires on spare terminals.
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Old 10th Jun 2020, 6:42 pm   #4
Dave Moll
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Default Re: 706L telephone - extra gravity switch

I recently wired up a Plan 105 (external) which required an additional gravity switch on each extension. In my case I used 746s, but maybe such a 706 would serve a similar function, except that I recall it specifying change-over contacts on the extra gravity switch.
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Old 10th Jun 2020, 6:47 pm   #5
AndiiT
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Default Re: 706L telephone - extra gravity switch

Hi, almost certainly a C wire signalling switch for use with a PMBX 2/X series PBX. See Page 2 fig.4 here

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Old 10th Jun 2020, 7:40 pm   #6
Sparks
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Default Re: 706L telephone - extra gravity switch

It's definitely just a simple on/off switch with just the two wires.

I'll leave the recall button as it is. Will I really need to disconnect the extra switch or can I leave it as is ? Either way I shall leave it fitted inside. It's just going to be a plain phone, no PMBXs etc.
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Old 10th Jun 2020, 11:08 pm   #7
Sparks
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Default Re: 706L telephone - extra gravity switch

PS. This telephone is a product of Phoenix Telephone and Electrical works - it has PXA printed on the base.
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Old 11th Jun 2020, 10:03 am   #8
Pellseinydd
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Default Re: 706L telephone - extra gravity switch

Quote:
Originally Posted by Sparks View Post
It's definitely just a simple on/off switch with just the two wires.

I'll leave the recall button as it is. Will I really need to disconnect the extra switch or can I leave it as is ? Either way I shall leave it fitted inside. It's just going to be a plain phone, no PMBXs etc.
Can leave as is - see fig 4 on N806 or converted as Tele 8746 similar connectionsN8846 Fig 3
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Old 11th Jun 2020, 11:08 am   #9
Sparks
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Default Re: 706L telephone - extra gravity switch

Thankyou, Pellseinydd. I'll leave it alone. The phone works fine with all the additional switches anyway so if it ain't broke...

It will be nice to have a black functioning 706 in my arsenal. The Ericsson magneto 706 I got back in April looks smart but sadly isn't much use to me.
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