Strowger Telephone Exchange - ATE 20/4A PAX

This electromechanical phone exchange was built by ATE of Liverpool (UK) in 1937. I've had it for a little over a year, and have taken it from non-working to fully working.
In this video, I'm running a BT Tester 355A Call Sender to repeatedly dial extension "35" to give the exchange a bit of a workout.
The call sender is shown at the end of the video, with the "monitor" sound turned up so you can hear dial tone, and ring tone.

[@michaeltidbury4835]

Interesting to see the tester operating. The equipment looks mint. Thanks for posting this video 👍.

[@thevideotube]

That's amazing! It looks so clean and it's so good to see it working.

[@lpbkdotnet]

Thanks! It's been quite a journey!

[@GlassTTY]

I maintained strowger in Rugby ATE (wasn't it the first strowger exchange or some such thing?), that sound is so memorable.

[@sanalkumarb2441]

I have worked and maintained this type of exchange near Trivandrum

[@THISMUSEUMISNOTOBSOLETE]

real cool!!!

[@Schrijver112]

great !!!

[@cambridgeblue3862]

Why all the 'N' links? 1&2 step the rotary magnet, 3&4 are the A&B in, so you've got a loop on, but still stepping to loop dis? 7&8 earth (busy) the 'P' wire. It shouldn't work like that!

[@lpbkdotnet]

This is a PAX, not a PABX or public exchange... so it "plays by different rules" somewhat! 🙂 The selectors contain all the relays for the LF, FS and tieline circuits (no GS on this one as it's only 2 digit numbering) so there are more test points required than in a more standard pattern selector. The A/B contacts (for plugging a butt in) are on the pair of contacts above the N links, next to the lamp holder.

[@cambridgeblue3862]

@@lpbkdotnet Thank You. Not a variety I worked ok so still time to learn! Keep up the good work and may your Type 1 'N', 'NR' or 'S' springs never wear out.