That's very interesting. I didn't know that Jochum used an additional brass section in the final coda. As a conductor, he was known to let the brass play out and didn't attempt to overly temper their sound, like certain conductors... You can hear this in Jochum's Beethoven, for instance (especially in his LSO 7th), and of course, it works to great effect in Bruckner, and the 5th is a 'brassy' symphony (as you point out).
You've not heard either of Jochum's Concertgebouw 5ths? (studio or live?) If the 5th is a symphony that particularly interests you, I'd urge you to hear Jochum's live Concertgebouw 5th from 1986. Some 'Brucknerites' consider it to be not only one of the great Bruckner 5ths on record, but also one of the greatest performances of a Bruckner symphony ever recorded. Granted, it may not be everyone's favorite 5th--as some listeners prefer Jochum's 'classic' studio account on Philips with the same orchestra, or Furtwangler's 1942 5th, etc.--but it's one of mine. For me, it is a spiritual experience:
There was something very special about Jochum's Bruckner towards the end of his life. I heard him conduct the Philadelphia Orchestra in Bruckner's 9th around 1985 or so, and it was a concert that I'll never forget. Jochum had reached the age where he could no longer stand and conduct, but that day the Philly orchestra was playing so brilliantly that in the Adagio, the 6'6" Jochum suddenly stood up to conduct. It was very moving.
Unfortunately, that was the only time I saw Jochum conduct, but the experience was a meaningful one. I had greatly admired him, not only as a conductor, but as a man. By all accounts, he was a remarkably kind human being & highly intelligent. A composer friend of mine, who knew Jochum at Tanglewood once told me that Jochum was "the nicest man I ever met who was a conductor."
The following live Jochum Bruckner 9th from Munich in 1983 reminds me of what I heard in Philadelphia that afternoon (interestingly, the performance was hand picked for release from the Jochum archives by the conductor's daughter, the pianist, Veronica Jochum): It's a favorite 9th of mine--though Jochum's EMI 9th with the Staatskapelle Dresden is likewise magnificent, & arguably comes with a better orchestra, so it may be preferable (to collectors):
It irks me when I hear certain critics dismiss Jochum as having been no more than a "kapellmeister" (or a "kapellmeister who could only conduct Bruckner"): A term that, oddly enough, has become a form of ridicule today, or at least carries with it a certain derogatory sense. I don't see Jochum's conducting that way at all (though obviously I don't expect to hear HIP performances from him, either). Rather, over the decades, I've come to notice that his recordings get better with repeated listening. It's as if you can't take it in all at once, but with further listening, over time, his special musical insights and perceptions into Bruckner, Wagner, Beethoven, Schubert, Brahms, etc., become more clearly evident. That is especially true of some of Jochum's lesser known live Wagner opera recordings--such as his Lohengrin, Parsifal, & Tristan und Isolde, for example. & what a pity Jochum wasn't able to make a final Parsifal recording, as he had planned.
Interestingly, I've been told that Jochum himself once commented that he was most proud of his Schubert recordings.
Another conductor who can be deeply spiritual in Bruckner is Sergui Celibidache. Listeners often dismiss Celibidache's Bruckner as being overly slow, which can be true (even though he's often faster than Giulini), but that isn't always the case. (Besides, I believe Celibidache was right to consider the experience of hearing Bruckner in the concert hall to be a very different experience from listening to Bruckner at home, since what can sound overly slow at home may not seem at all slow in the concert hall.) For instance, Celi's late Sony Japanese Bruckner releases of the 7th & 8th symphonies are remarkable, IMO; plus, he could be great in Bruckner's 5th, as well (I should have mentioned him on my previous list of favorite Bruckner 5ths):
Bruckner 5, Celibidache, Munich Philharmonic, live:
https://www.amazon.com/Bruckner-Sym...libidache+bruckner+sony&qid=1612466095&sr=8-5
https://www.amazon.com/Bruckner-Sym...libidache+bruckner+sony&qid=1612466095&sr=8-7