I've had to readjust mine twice for the on-off pointer to be correct on two different potentiometers. It's holding okay so far, but I'd like to have a backup IF there's a source for them. TIA...Happy New Year, everybody...
Searching for the Small friction fit "half moon" springs in McIntosh C28 knobs
- Thread starter Ricktptman
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smartin53
Well-Known Member
So I've thought about this before (but admit haven't tested it) but I wonder if clipping an appropriate length of metal from one of those old school snap bracelets might be the perfect solution.
I've rolling around something like that very idea, I just didn't know WHAT donor material with which I should try it. The knob itself is in beautiful shape and I know I can buy machined reproductions online that don't need the clip. I presume they're indistinguishable from the originals, but I wouldn't know that until I had them side by side. I'm over budget on this project already, so I'm not looking to make that situation worse. It needs to be hard enough to not have much "give" but malleable enough to be shaped to fit. I was actually thinking about a spent .22 LR casing flattened on one side, but it would have to be cut roughly in half. I don't have that many "machine shop" type tools. It'd probably boil down to a set of side cutters. Maybe just grind the casing down on a bench grinder. I have one if you can count one of those $19.95 "Hazard Fraught" jobs I picked up about 25 years ago before Harbor Freight became the runaway success is it today. It's about 1/8 HP if you know what I mean... "Trrrrricky..."
A Dremel tool with a cut-off wheel would do the job.
https://www.dremel.com/en_US/produc...-ez-lock-1-1-2-thin-cut-cut-off-wheels-5-pack
https://www.dremel.com/en_US/produc...-ez-lock-1-1-2-thin-cut-cut-off-wheels-5-pack
Thanks, Gentlemen. That helps a LOT. Onward to Google. Thanks, Pio1980, for the advice on not using rifle brass. Just "spitballin'".
Pio1980
AK Member
That's one type of several I had in mind, is that what Mac always used used?
Concentric knobs likely will vary in size requirements.
Followup: I found one for about $4.00 on my door. It was an EXACT duplicate of the one in the C-28.
The typical price is around twice that, but I did find several KNOBS (that come with the clip) that were around $5.00 shipped. I don't anticipate needing another one.
If I find the right deal on a few of them, I might buy a couple of extras to keep around. My C28 project is pretty close to being finished. The volume control still doesn't work as it should, but it's A-OK at the beginning of its rotation and it's A-OK at the end. The balance tracking issues are gone. The only thing left is a slight change in level and tonal roll off in the middle of its rotation. So I just leave it there (either just on or all the way open) and I've installed a quality remote control between the preamp and amp that makes the issue a pretty minor annoyance. The headphone output needs recapping (or maybe a set of transistors, or both) but I use the amplifier's headphone output, so it's not really an emergency. Thanks again for the advice. That solution was 100% GREAT.
The typical price is around twice that, but I did find several KNOBS (that come with the clip) that were around $5.00 shipped. I don't anticipate needing another one.
If I find the right deal on a few of them, I might buy a couple of extras to keep around. My C28 project is pretty close to being finished. The volume control still doesn't work as it should, but it's A-OK at the beginning of its rotation and it's A-OK at the end. The balance tracking issues are gone. The only thing left is a slight change in level and tonal roll off in the middle of its rotation. So I just leave it there (either just on or all the way open) and I've installed a quality remote control between the preamp and amp that makes the issue a pretty minor annoyance. The headphone output needs recapping (or maybe a set of transistors, or both) but I use the amplifier's headphone output, so it's not really an emergency. Thanks again for the advice. That solution was 100% GREAT.
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