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Author Topic: Telecoms: What's a Regulator 6B?  (Read 6205 times)

4candles

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Telecoms: What's a Regulator 6B?
« on: October 04, 2012, 05:59:53 PM »

Hi All,

Rooting about in my junkbox, I came across a Regulator 6B, and I'd like to know what it's for.

It's a 1974 Post Office item, Rate Book (is it still called that?) Item Code 434915. About 3ins (8cm) long, it appears to comprise solely of an inductor, or at least some wound component, and two zener diodes.

I think it may have some connection to a Jack Unit 1A or 1B, which housed the same circuitry as a 700 series telephone, into which one plugged a headset for use on, typically, a Works Order/Circuit Provision desk.

Googling has proved fruitless - any information appreciated.
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burakkucat

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Re: Telecoms: What's a Regulator 6B?
« Reply #1 on: October 04, 2012, 09:03:58 PM »

Interesting. I don't recognise that device.  ???

Perhaps Black Sheep's friend, the retired one-eyed-Archie, may know?
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Black Sheep

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Re: Telecoms: What's a Regulator 6B?
« Reply #2 on: October 04, 2012, 09:08:08 PM »

I hope he does, 'cos I haven't got a clue what it's for ??  :no: ???
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Jonnyteg

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Re: Telecoms: What's a Regulator 6B?
« Reply #3 on: October 08, 2012, 04:04:42 PM »

Never seen that before  ;D oh well maybe one of the old GPO guys can explain  :graduate:
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burakkucat

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Re: Telecoms: What's a Regulator 6B?
« Reply #4 on: October 09, 2012, 02:17:19 AM »

It seems as if we are all now waiting for openreach dude to tell us that he remembers them well . . .  :D
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Black Sheep

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Re: Telecoms: What's a Regulator 6B?
« Reply #5 on: October 09, 2012, 08:01:07 PM »

I stand to be corrected, but from what I can glean, OD hasn't been 'on' a long time ?! Therefore I think we need a real long-timer to come forth. ;) ;D
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burakkucat

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Re: Telecoms: What's a Regulator 6B?
« Reply #6 on: October 09, 2012, 08:08:28 PM »

I don't recall when he last posted but when I check the stats. for OD I see --

Quote
Last Active:    September 30, 2012, 01:43:38

Not all that long ago.  :angel:
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Black Sheep

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Re: Telecoms: What's a Regulator 6B?
« Reply #7 on: October 09, 2012, 08:13:13 PM »

Sorry, by 'on',  I meant as in working for BT/OR.  :)
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burakkucat

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Re: Telecoms: What's a Regulator 6B?
« Reply #8 on: October 09, 2012, 08:32:11 PM »

Ah, my mistake!  :-[

Considering the 700-series telephones first came into use in 1959 (I saw my first one in the early 1960s), we possibly need some input from an ex-GPO Telephone Engineer.  :)
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4candles

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Re: Telecoms: What's a Regulator 6B?
« Reply #9 on: October 10, 2012, 07:46:28 PM »

Gentlemen,

Thanks for all the interest. I've been doing some more intensive digging, and eventually found this PDF of a Jack Unit 1B -

http://www.samhallas.co.uk/repository/po_docs/SA9228.pdf

Note 3 states that the regulator is fitted between T11 and T17, which effectively places it in parallel with the transmitter in the headset.

As the Jack Unit would in most cases be used in, or very near to, an exchange, I can only think that maybe it was to limit the voltage across, and thereby the current through, the headset transmitter. Perhaps otherwise they tended to 'fry'?

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Black Sheep

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Re: Telecoms: What's a Regulator 6B?
« Reply #10 on: October 10, 2012, 07:56:59 PM »

Put it forward as a 'New idea' to the Guv'nor of Texas. It could act as a dual-purpose device that replaces 'Old Sparky'. The death row inmate could use his last phone call and pay his pennance at the same time.  ;)
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burakkucat

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Re: Telecoms: What's a Regulator 6B?
« Reply #11 on: October 11, 2012, 01:10:34 AM »

I've been doing some more intensive digging, and eventually found this PDF of a Jack Unit 1B -

http://www.samhallas.co.uk/repository/po_docs/SA9228.pdf

Note 3 states that the regulator is fitted between T11 and T17, which effectively places it in parallel with the transmitter in the headset.

Ah, that clearly shows its use. Interestingly that plan seems to show the PCB of a telephone type 746.  :)
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4candles

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Re: Telecoms: What's a Regulator 6B?
« Reply #12 on: October 11, 2012, 10:52:44 AM »

Interestingly that plan seems to show the PCB of a telephone type 746.  :)

Aye, well, it would. See OP.   ;)
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burakkucat

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Re: Telecoms: What's a Regulator 6B?
« Reply #13 on: October 11, 2012, 07:17:02 PM »

Interestingly that plan seems to show the PCB of a telephone type 746.  :)

Aye, well, it would. See OP.   ;)

You had me thinking that I had committed yet another folly, 4C but, fortunately, when I rechecked it I saw that what I had thought was there --

Quote
. . . which housed the same circuitry as a 700 series telephone . . .

The first 700 series telephone that b*cat recalls is the 706, introduced in 1959. That was the ultimate parent of the 746 (and other subsequent minor variants).  :P
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4candles

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Re: Telecoms: What's a Regulator 6B?
« Reply #14 on: October 11, 2012, 09:11:10 PM »

Point taken, Mr Cat, though I maintain that '700 series' includes the 746.  ;)
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