Board cut in half and the preamp section replaced with this monstrosity.
Another area repair shop sent this to me to sort out; they already removed the "extra" tube and tried to rewire it but it didn't work. It belongs to a backline rental company. I'll have to make a new board to replace the missing portion. I'll be returning it to stock...at least from a function standpoint.
The mod was fairly recent (2001) based on the cap dates.