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This was in a job lot of soundboxes which I purchased recently, and I can find nothing about it on line.
The letters "S.R.C." and the letter "L" below them must stand for something, but what?
There is a very rare Adelphi record label, but a connection is unlikely.

epigramophone wrote: Sat Feb 07, 2026 11:25 am This was in a job lot of soundboxes which I purchased recently, and I can find nothing about it on line.
The letters "S.R.C." and the letter "L" below them must stand for something, but what?
There is a very rare Adelphi record label, but a connection is unlikely.

According to 'AI' (take it or leave it):

"The Sound Reproduction Company (S.R.C.) was a British component manufacturer active during the height of the gramophone era in the 1920s and early 1930s". .............

and the letter 'L' stands for "large diaphragm size". ...................................

It’s very interesting as this is a believable sounding answer from AI.

If I play around with the words and initials I get completely different answers from AI and not the one you got.

jamiegramo wrote: Sat Feb 07, 2026 1:18 pm It’s very interesting as this is a believable sounding answer from AI.

If I play around with the words and initials I get completely different answers from AI and not the one you got.

So, here is the definative 'AI' answer:

In the niche world of acoustic gramophone collecting, a soundbox marked
SRC is often identified by experts as a product made or modified by EMG (E.M. Ginn) or their closely associated workshop partner, Horace Hill.
Here is how the "SRC" marking connects to the EMG legacy:
The SRC and EMG Connection

Manufacturer: The marking SRC typically stands for "Scientific Reproducer Co.". While this was a distinct branding, it is historically linked to the craftsmen who built EMG and Expert machines.
The Horace Hill Link: Horace Hill was the engineer who machined all the metal parts for EMG gramophones in their Grape Street basement. After E.M. Ginn lost control of EMG and founded "Expert Handmade Gramophones," Hill continued making parts for both firms. It is widely believed in the collector community that Hill used the SRC brand for soundboxes he produced independently or under license.