Loudspeaker Mystery

[David Dunlop]

Sorry, I meant to ask this earler.

No rush, but when you get a chance, can you post some photos of the insides of that L.S. No.2 Canadian Control Unit Mk I?

Thanks,

David

[Johnny Canuck]

Hello David
Telephone Loudspeaker was used to control a battery of 25 pdr's or 4.2" mortars.
The L.S. No.2 Canadian Control Unit was located at the CP and connected to the Loudspeakers by 2 wire cable. The CP could send instructions to the guns and the guns could reply by pressing the Push button and then yelling into to speaker to send a reply.

Some scans from a 1943 British 4.2" Mortar Manual.

Geoff

[David Dunlop]

Geoff:

Thanks for the additional information. Every little bit helps in better understanding this equipment.

I had considered the speaker being used to 'mic' back information, as electronically there is little difference between mic and headphone element design/function, but the rather robust look of these speakers made me hesitate about that possibility.

I dug up a second speaker and it has been repainted so much all traces of original stencils are long gone and just the 'PRESS TO SIGNAL" new printing is visible. I have a second pair tucked away somewhere and must track them down to see what they can tell me.

Is the Control Unit a rare bird? With the large numbers of speakers that used to be lying about in these parts, I am puzzled I have never spotted the Control Units or manuals.

David

[Bruce Parker (RIP)]

Originally Posted by David Dunlop

Sorry, I meant to ask this earler.

No rush, but when you get a chance, can you post some photos of the insides of that L.S. No.2 Canadian Control Unit Mk I?

Thanks,

David

As requested:

[Jordan Baker]

Ive seen other pictures but this is what I could find.

[rob love]

I either have or had the CFTO for this setup. I may have given it to Derk Derin.

[David Dunlop]

This item showed up on eBay this past week from Holland. Appears to be a British Tannoy with a couple of noticeable differences from the Canadian Unit we have been discussing. I was tempted to bid but the shipping price could easily have exceeded the final cost of the unit. Also the differences made me hesitate.

The Canadian set has only four lines output, which makes sense to me as an artillery item. This British one, however, has six output lines, which is a puzzle. What would the two extra lines be used for, and would this have made the British set more versatile/flexible?

David

[Chris Suslowicz]

Originally Posted by David Dunlop

This item showed up on eBay this past week from Holland. Appears to be a British Tannoy with a couple of noticeable differences from the Canadian Unit we have been discussing. I was tempted to bid but the shipping price could easily have exceeded the final cost of the unit. Also the differences made me hesitate.

The Canadian set has only four lines output, which makes sense to me as an artillery item. This British one, however, has six output lines, which is a puzzle. What would the two extra lines be used for, and would this have made the British set more versatile/flexible?

David

It's almost certainly a different set. The Telephone, Loud Speaking, No.2 YA.2803 is for a battery of four guns, and it's entirely possible there were other requirements for more (or less) out-stations.

Some other types were:

Telephone, Loudspeaking, No.5 (YA.5296) for "outdoor public address to small assemblies". This had a single speaker and the whole lot mounted on a folding metal frame

Telephone, Loudspeaker No.3 (Obsolete in 1944 EMER) for use with W.S.9 in AFVs as an intercom between commander and crew.

Telephone, loudspeaker No.4 (YA.4930) for use with H.A.A. or Z-battery sites using an omnibus circuit. (e.g. Command Post, G.L. Receiver Cabin, G.P.O, and a Z-battery C.P. (the last is for listen only).

Then you get on to Apparatus Loudspeaking, which is for general P.A. work

No.4 (man-portable) for ARP work
No.5 (truck mounted) "a powerful mobile P.A. for propaganda purposes, etc."

Chris.

[David Dunlop]

Thanks for the information, Chris.

I will pass on this one and keep an eye out for a good unit of the Canadian version covered earlier in this thread. Make a better match for my four Canadian speakers.

David