Hello and welcome to the forum! Congratulations on the inheritance of your
Edison Diamond Disc Phonograph (not Victrola - that is a type of internal horn talking machine produced by the
Victor Talking Machine Co. of Camden, NJ).
Thomas A. Edison Inc. of Orange, NJ introduced the "London Upright" (LU) in August 1922, to meet the demand for an (relatively) inexpensive model to their extensive line of Disc Phonographs. The
Edison Diamond Disc Phonographs were some of the most highly engineered machines of the era, and were produced in a wide variety of models from between 1912 until they stopped production forever in late 1929.
As has been pointed out, the
Edison Diamond Disc Phonographs were produced to play their proprietorial Diamond Disc records specifically, and should
not be used to play other "78" type records - unless using another type of
reproducer specifically designed for the lateral-cut (side to side) groove of those records. Edison's Diamond Disc groove is cut using an up and down (Hill and Dale - or vertical-cut groove) - meaning that the
diamond stylus of the Edison
Reproducer will follow the groove in an up and down fashion, whereas the soundbox of a Victrola was designed to follow the "side to side" cut groove of a typical "78" record, which also propelled the Victrola tone arm across the record.
The
Diamond Disc Phonograph horn and reproducer are
proprietarily mechanically driven across the record by means of a rack and pinion type of arrangement, and can be a little intimidating to service. Fortunately the forum has a complete service manual that can be used freely for those wishing to do a tune-up, or at least familiarize themselves with the particulars of the Edison Diamond Disc mechanism. It can be found here:
http://forum.talkingmachine.info/viewto ... ?f=2&t=476
The topic of different acoustic record manufacturers is wide and deep, and by the mid-1910s, hundreds of manufacturers began producing their own varieties, some were excellent performers, others were relatively poor. The
Edison Diamond Disc Phonograph, is still regarded by many as the epitome of design, although many fault the recorded material as lacking, when compared to some of the other manufacturers' music genres. However others may perceive the Edison Diamond Disc Phonograph, and records, there is an incredible amount of great music to be found to play on your LU 37.
There is a ton of great information here, using the search feature found at the top of the page.
As you've already noticed, your reproducers need servicing, and as has already been pointed out
Wyatt Markus does a great job doing the repairs on a variety of phono-related items. Also not mentioned is
Steve Medved, he is the foremost knowledgeable Edison Reproducer specialist in the hobby, and he sources the diamonds used for rebuilds industrywide -
exclusively. He can be reached via email at,
[email protected]. Whomever you choose, you'll be happy with their work. However,
Wyatt Markus tends to perform repairs much quicker. His contact information is here:
http://forum.talkingmachine.info/viewto ... =2&t=42795
Have fun, and don't be a stranger!
Best,
Fran
It will boost the sound of your London Upright better than the original rice paper diaphragm! 
