How To: New Wire-5 project (Bergeron)

[Chris Suslowicz]

Originally Posted by Robert Bergeron

Built a homemade Tannoy speaker today to listen to the WS No 19 set . Still looking for an amplifier to connect to one of the drop plugs but the search is narrowing .

Looks good. Does the Tannoy speaker have a transformer attached to it?

There's a discussion of the Sexton SPG setup with Control Unit 190 that uses the WS19 IC amplifier to drive the loudspeaker. (This is not what you want, as it will be much too loud, being intended for 25 pdr gun crew instructions in a confined space, and the gun crew did not use headsets.)

It may provide a few pointers on how to do it, though.

(I recently bought a Canadian ALS No.2 Mk.2 loudspeaker (with added woodworm) that has the lower pair of terminals for the WS19 IC amplifier drive. That uses the 30 ohm tapping on the transformer (the ALS uses a higher impedance drive - I think what was known as "100 volt line" - to allow the use of field cable without excessive losses), and the loudspeaker switch selects 'A' 'Off" and 'B' on the Control Unit 190, with a resistance in series to prevent overloading the amplifier. (I intend to draw out the circuit diagram from the photographs in that thread, and match it with the parts list from EMER Tels FZ-256/3 in order to (a) see how it is supposed to work, and (b) construct something vaguely similar.)

The Sexton appears to be fitted with Control Unit No.2 for the Wireless Op,
No.190 for Commander (droplead) and gun crew (loudspeaker), plus a Junction Distribution No.3 for the driver intercom - though I need to check that.

On the move only the commander, wireless operator and driver would have headsets (intercom and wireless), maybe with the loudspeaker on when required. Deployed they could use wireless or lay wire and use the ALS for the GPO and four guns. (I think - I'm not an artillery person.)

Best regards,
Chris.

[Bruce MacMillan]

Originally Posted by Chris Suslowicz

There's a discussion of the Sexton SPG setup with Control Unit 190 that uses the WS19 IC amplifier to drive the loudspeaker. (This is not what you want, as it will be much too loud, being intended for 25 pdr gun crew instructions in a confined space, and the gun crew did not use headsets.)
Best regards,
Chris.

The Canadian Army did approach PYE about producing a speaker for the 19 set. Quote was only a few £ (pounds, quid) per speaker. At that price it must have been only a box, speaker and maybe matching xfmr. They must have thought this was adequate enough volume to be useful. If you're not broadcasting to the neighbourhood you don't need much power.

[Robert Bergeron]

Thank you Chris and Bruce for your help and comments . Mystery solved gents . I had a two line telephone wire between the loudspeaker and the control box droplead and the speaker works fine on the A set and the IC . No need for an amplifier . Just plug the wires in the terminals at the bottom of the loudspeaker box . They are marked No 19 set …… I guess i could not go wrong . No more «*@@&{}#*^ tight headsets for me !

[Robert Bergeron]

My friend Yves has finished making the control panels for the generators . Wow , so close to original ! Sourcing the parts was not easy . Bakelite or it’s modern equivalent , Phenolic is very expensive and difficult to source . Thanks again to Reg Hodgson for the electrical diagram .

[Robert Bergeron]

Behind the generator electrical control panel i am installing .Panel all wired up. It’s easy when everythink is all marked with codes as on the plan / diagram I will be looking for a smaller electrical box eventualy .

[Robert Bergeron]

New battery and new gas tank installed today . Still working on sourcing brake parts . Now that i know they are Ford certainly helps. Thank you friends . Made an order with Mac’s .Went to pick up the newly overhauled radiator with new core .

[Robert Bergeron]

OK Chevy / Ford Blitz fans out there : Why two sizes ( width ) of brake excentric washers on these trucks ? I noticed of course that the rear shoes are way larger but that does not explain everything . Bob Carriere posted that they are 2 dfferent part numbers . That must mean something .