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Post by Michael Messer on Dec 3, 2023 13:46:04 GMT
I will speak to Dave King about this and let you guys know what her says. I know he has been through this problem and solved it.
Shine On
Michael
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Post by pete1951 on Dec 3, 2023 16:57:49 GMT
Thanks Michael, My ‘add on’ magnets are strong ceramics. I think they came from an industrial door catch. I had them cut down to the right size with a plasma cutter ( I think that’s what it was called, it happened under water  ? Is that possible?. I wasn’t there to see the operation ) It was done by some tame engineers at my local university. We wondered if it would decrease the magnetic power but they came through ok. Pete |
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Post by chromatic on Dec 3, 2023 18:40:42 GMT
I had that issue with a 1946 Supro Supreme and got some new magnets from a guy in England - will see if I can find the details, it was pre-Covid.
Just found the original magnets in the case and they are very weak and just about pick each other up. Was hoping that the receipt for the new mags would be in there but no such luck. There is the 1988 receipt for the guitar bought from Jimmy Brown's shop, Guitar Emporium, in Louisville. A snip at $50.
Cheers
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Post by Pickers Ditch on Dec 3, 2023 19:28:21 GMT
Bugger! I better check my 1955 - not used it since covid lockdown,
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Post by mitchfit on Dec 3, 2023 19:39:39 GMT
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Post by mitchfit on Dec 3, 2023 19:55:05 GMT
^^^^
PS--3 each of the 4" x 1" x 1" thick bar magnets on page 18 could be fitted together in a square horse shoe shape for entire magnet replacement?
but when you can't get the microphone stand loose from the front of your guit, don't say you weren't warned beforehand.
mitchfit
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Post by tractorking on Dec 5, 2023 4:25:32 GMT
Those magnets charge pretty easy if kept in contact with neodymium magnets for a couple days. In addition to having fully charged magnets, two other things make a significant improvement. First, pole piece height adjustment is critical. Output is very sensitive to this so play around with adjusting the height of each pole till you hit a good strong sound from each string and good balance between strings. Second, the strings need to pass right over the center of the holes on the cover plate. If they are even slightly off center it will weaken the sound so check that and adjust the position of the saddle or the spacing of the string slits.
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Post by Pickers Ditch on Dec 5, 2023 8:52:39 GMT
Checked and mine's OK (so far).  |
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Post by Michael Messer on Dec 5, 2023 13:44:50 GMT
I just spoke to Dave King about these pickups. It is many years since he made a guitar with a Supro pickup, but he said all he did to bring them back to life was stick another magnet on the end. He thinks that only one of the ends of the pickup has a magnet. I could test that, but I don't want to take the cover off mine and maybe disturb something that doesn't want to be disturbed. So try sticking a couple of powerful little magnets on the outside edge of whichever of the two is the magnet.
My Supro pickup that I have had since 1985, first in a lap steel and now in my Telecaster, is still working perfectly, so I don't want to mess with it. i have used that pickup on hundreds of recordings and probably thousands of gigs.
Shine On
Michael
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Post by mitchfit on Dec 5, 2023 19:23:04 GMT
just guessing here, no experience with these at all. after some digging, have found these are entirely different from the original Beauchamp patent in my memory: patents.google.com/patent/US2089171A/enhence my uninformed "horseshoe" magnet reference in upload above. if the red arrows point to magnets as shown below: bb.steelguitarforum.com/userpix2020-03/9094_4230_NationalStringThrough8String_03_1_1.jpgwould expect if both ends of the magnetic field still retained equal magnetism that the equal pulling forces on the strings created between them would have less tendency to deaden string vibration? [sustain] GETTING WELL OFF THE BEATEN PATH OF THIS THREAD-- if that assumption is true, it seems the 1937 Beauchamp patent would have even less dampening effect than modern PUPs in that the magnetic pull of two horseshoes surrounding the strings entirely with mostly equal attractions would be better to enhance sustain? mitchfit |
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Post by chromatic on Dec 30, 2023 17:01:09 GMT
Might cause total havoc in the post from the USA? Cheers |
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Post by mitchfit on Dec 30, 2023 21:19:12 GMT
^^^^
something i hadn't considered. maybe they get inches of bubble wrap to distance magnetic field attraction?
didn't notice [or look for] shipping restrictions, but assume it has been dealt with before.
not sure,
mitchfit
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Post by Matt on Dec 31, 2023 6:43:25 GMT
I got it from George Gruhn in 1985. These pickups, when working correctly, are super powerful. Shine On Michael Would that George Gruhn have been the proprietor of Gruhn Guitars on 8th Ave in Nashville, next door to where I picked up groceries for New Year's Eve this afternoon? I'm glad I finally found my way back to this forum. |
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Post by Michael Messer on Dec 31, 2023 9:47:13 GMT
I got it from George Gruhn in 1985. These pickups, when working correctly, are super powerful. Shine On Michael Would that George Gruhn have been the proprietor of Gruhn Guitars on 8th Ave in Nashville, next door to where I picked up groceries for New Year's Eve this afternoon? I'm glad I finally found my way back to this forum. Indeed, that's the George I was talking about. This one....  Shine On Michael  |
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Post by mitchfit on Jan 2, 2024 2:54:33 GMT
dated information alert:
not trying to be overly cynical here but address is antediluvian at best.
new address is 2120 8th ave south, Nashville (etc)
the little mouse eared critter playing a guit came in the boxes with my 6L6/5881 Victorilux 310 from there very many moons ago. the EL 84 model wasn't made then. same showed up wearing a smart looking tweed suit back when Gruhn was the last (IIRC) dealer around who would still ship -used- tube amps. don't think tweed is still an option today.
[new offerings have to go back to manufacturer leaving dealer/shipper free of any warranty coverage.]
have sang praises about their shipping method used then here before, but will again. arrived in a big box with about one inch clearance all around a smaller box within. little packets of what appears foam insulation were set at each corner of the amp, about one inch all around smaller than amp. then the same was done between the inner and outer box corners.
LOW TECH GENIUS!!!
to pete1951--
read your posting on previous page again and the cutting procedure sounds like electro discharge machining.
EDM requires a liquid submersion of product much like your description.
mitchfit
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? Is that possible?. I wasn’t there to see the operation ) It was done by some tame engineers at my local university.
