EDISON C250 question

[billybob62]

I just got an Edison C250 and played a couple of records. I was surprised to learn that the turntable stopped at the end of the record.
I was under the impression that an automatic battery operated attachment had to be installed for that to happen. Needless to say, I was happy to learn that I didn't have to wait in the room for the tune to end.
p.s. Fran, I will get you the information you requested and PM you probably next week.
j.

[winsleydale]

All Diamond Disc machines stop automatically at the end of the record (though not necessarily directly after the end of the song). If it happened that the end of the song was followed quickly by the triggering of the autobrake, then either it was a long record and the brake is set correctly, or if the record was not all that long, then the brake is out of adjustment and will stop in the middle of longer songs.

[billybob62]

Thanks Winsleydale. I believe it was at the end but I will pay close attention and post again if need be. Prithee, of what benefit, then, is the battery operated attachment?

[winsleydale]

It is supposed to make the brake trip at the end of the song, regardless of song length, I believe.

[fran604g]

Hiya John,

That is known as the "safety stop", and I recently posted the procedure for adjusting it here, if it becomes necessary http://forum.talkingmachine.info/viewto ... 21#p132921

I look forward to adding your information to my database.

Best,
Fran

[fran604g]

Thanks Winsleydale. I believe it was at the end but I will pay close attention and post again if need be. Prithee, of what benefit, then, is the battery operated attachment?

The battery operated "Electric Automatic Stop" was merely a device that sought to improve the function of the safety stop by allowing the brake to be actuated at the very end of a recording, despite its length.

The mechanical "safety stop" is just that, and is adjusted to a pre-determined point at the end of a record to prevent the reproducer stylus from travelling too far and contacting the record label, and possibly causing damage to the stylus. In my article here: http://www.antiquephono.org/edison-auto ... tric-stop/ I go into great detail explaining the difference of both systems.

Best,
Fran

[PeterF]

In a nutshell...

The mechanical stop simply stops the turntable at a preset spot in the travel of the tonearm. So with shorter records, there's a long period of crackle and pop before the thing finally shuts itself off, and on long records sometimes you run the risk of stopping before the record is quite over.

The electric brake, or Duncan Stop, relies upon the reproducer's positioning relative to the grooves in the record to stop the turntable - when the grooves end, the reproducer's weight/stylus module stops traveling, but the reproducer body and rest of the tonearm and horn keep moving along. As a result, soon afterwards, electrical contact is made between the weight's limit pin and the body of the reproducer and the connected electrical trigger trips the brake.