sundance-communications.com/forum Forums Other TDM Phone Systems Antique Telephones another What is this ??

Found this in a box that had among other things some old TeleType tools and what not. It looks to be some type of driver or adjustment tool it has an unusual Delta style tip hmmmm !

Here are the pics.

https://s5.postimg.org/ikcksippj/DSCF4182.jpg

https://s5.postimg.org/66zqlm013/DSCF4185.jpg

could someone give me a hint how to show pictures in the post ?

It's a KS-19355 L8 Adjuster, used to tune the ferrite coils on a 25- or 35-type Touch Tone® dial. There's a coil for the high tones and a coil for the low tones. They are the round gray things on the back of the dial. See BSP 074-202-121.

You tune them by looking at a frequency meter, or, in the field, by using a known good dial and "beating" them.

"You tune them by looking at a frequency meter, or, in the field, by using a known good dial and "beating" them."

If you don't happen to have a "known good dial," You can also tune them by using a 2 pound sledge and a good anvil.

Rcaman

How bout that !

I would never have guessed that, would seem to be easier to just swap out dial. I am sure these do not get that much use anymore.
Until I find another off the wall item


Thank you all .

"You can also tune them by using a 2 pound sledge and a good anvil."

A very thoughtful, nuanced and elegant approach. Don't forget to wear your safety glasses.

Rcaman: personal message sent.

I have to wonder if the corresponding coils on DTMF receiver cards in intercoms used the same tool? More importantly, was that level of troubleshooting done in the field with say, 247A KTUs?

Ed, there were several adjustment tools that were used for various ferrite cores. The next answer is "yes" on CO DTMF receivers, but "seldom" on later-era subscriber equipment.

The 247A dial intercom adapter was notorious for not being tuned in properly from the factory (you probably recall the tedious BSP instructions on how to get it to work even moderately well) and for going out of tune in the field. It was the first generation and was a "work in progress" to be diplomatic. The 247B was always spot-on out of the box.

I only saw and suffered from a couple of the A versions, and saw many B versions. Then they all were made obsolete by the packaged units from Teltone and Melco which were finally stocked by Bell companies who threw in the towel until the 4xx series of 8" intercom cards were brought out. They were the 407, 424, etc. and they never needed adjustment, either.

Arthur, while I agree with Bell's decision to give up on intercoms, you have to admit that the 494A was a good last shot at it.

Yes, the ultimate plug-in intercom was the 494A. 8 inches high, 80-pin connector, built like a Mack truck. Don't drop it on your foot.