Diamond Disc 250 horn alignment question

[fran604g]

Yes, Dad...

[mikejk]

George and Fran,
I think I will coffee up for tonight's festivities !
Mike

[fran604g]

[fran604g]

Hiya Mike,

I'm not trying to beat a dead horse here, but I discovered an old post here that adds another dimension to the "horn alignment" conversation. This could explain how some horn joints became damaged and misaligned over the years.

I'm NOT saying this could be your problem, just adding more information to this particular conversation (I hope I don't cause too much confusion doing this).

Bending the horn rearward or forward to ensure the reproducer limit pin stays in the relative center of the limit loop during play:

http://forum.talkingmachine.info/viewto ... &hilit=C19

The third post is most informative, I hadn't noticed that passage in the service manual before.

Fran

[Discman]

Fran,
If you have a copy of the instruction booklet for installing long playing equipment on the Edison Disc Phonograph, the first 3 pages cover in detail the process for checking and adjusting alignment of the horn. A special gauge and alignment bar were made for this purpose.
Dave Jolley

[fran604g]

Fran,
If you have a copy of the instruction booklet for installing long playing equipment on the Edison Disc Phonograph, the first 3 pages cover in detail the process for checking and adjusting alignment of the horn. A special gauge and alignment bar were made for this purpose.
Dave Jolley

Thanks for that info, Dave! I seem to remember coming across a post, or something somewhere that outlined the procedure, but I can't remember where, or when, I may have seen it.

Fran

[mikejk]

Fran,
Thanks for the info posted above. In 2005 when I bought my first Diamond Disc machine, I wrote Ron Dethlefson , and he sent me a copy of the repair/maintenance booklet for the Diamond Disc which made me familiar with the mechanism right from the start.
I have read the past posts you provided, thank you. The horn bending certainly works, I have had to do this to one of mine.
The horn on my C-19 shows no sign of having been bent, twisted, creased, or damaged in any way. No damaged paint on the neck or signs of it being mishandled.
I have come to accept that there is nothing wrong with my horn at all but that there is a minor flaw in the set up which will not allow some discs to finish. Some of these discs are recorded very close to the label edge, some only half an inch from the label edge. When playing these discs, the grille must be removed so they can finish; simple enough. I have tried to loosen the neck connection to move the neck elbow over so the horn will not hit but it will not loosen . I think things are best left alone.
Thanks again,
your new Chippendale junkie,
Mike

[fran604g]

Hiya Mike!

Sometimes I think we're the only ones here!

Maybe I'm just being too much "geek", but it fascinates me that the simple operation of such an amazingly complex piece of early 20th century precision can come down to bending a part of it.

In a separate topic post today, I became aware of how this simple adjustment could have big implications on the function of the electric automatic brake that was used.

For me, posts like this one are as illuminating as a bright light turning on inside my head.

Fran