I don’t know what the rotor looks like, but the casing and adjacent tubing isn’t all that clean…


Agreed on the tubing.

The rotor and bearing have both been cleaned in household vinegar.

The casing however was later cleaned up better than what shows in the picture, while with the tech and ...

Hello!

I guess you've tried moving the linkage by itself without it being hooked to the rotor.
That's correct; the linkage alone is essentially silent, and when turning the spindle without the linkage being hooked up I hear the rubbing sound.

I believe you exercised good judgment in declining ...

Hello!

I have an old'ish B&S F tuba (GDR, around 87) that has a strange rubbing noise on the 5th valve.

I've visited 2 techs so far, and neither of them were very concerned about it as the rotor is free-moving, fast and doesn't bind at all.

A few observations with the techs:
1. Upon disassembly ...

Bump!

hello! I use 2 regular velcro cable ties and a shoe lace attached to both ends. With one end before the outer slide tube, and the other end below the brace, it stays in place quite well and never had to readjust it at all.

Link to the cable ties: https://www.amazon.ca/Reusable-Trilancer-Adjustable ...

*** SOLD ***
Hello!

Putting up for sale my Jupiter JCB582 (BBb 4 valve)
Specs: .732 bore, 17.4 inch bell, 4/4 size

Tuba is in great condition, very few dents/scratches as best as I could capture them in the pictures:
https://drive.google.com/drive/folders/1ka6KJARNmF8xRGnjakMGLjI19-zpWz6U?usp ...

Hi there, this isn't mine, but the seller posted a PT-6 on another tuba forum (which doesn't work anymore) and I know it was not sold yet as of 2 days ago:

https://drive.google.com/drive/folders/1xGHE2fR-OapI4SzjUko9-H5VOTWjcjuN

He was asking for 12K$CAD in the other forum, near Toronto.

If that ...