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 Post subject: Music Master Base Disassembly
PostPosted: Sep Fri 10, 2021 1:51 pm 
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Joined: Apr Tue 24, 2018 6:12 pm
Posts: 60
Location: Charleston, SC 29410
Hi. I am hoping someone on this forum has been able to pry the bottom off of a Music Master base to access the driver for a horn speaker. I really don't want to damage it and there are no screws to remove it. It appears that it was installed similar to a paint can lid and it appears also that the only way to get it out is to pry it out but I don't want to damage the base in doing so. I'm thinking about applying some WD-40 but I'm afraid to do that as well.
Any help with this would be greatly appreciated.
Thanks very much.
Jim Houston
Charleston, SC


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 Post subject: Re: Music Master Base Disassembly
PostPosted: Sep Fri 10, 2021 2:55 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 1125
Location: Bristol TN 37620
Don't pry it! Almost all horn speaker drivers of this era
screw into the base. Many are pot metal that disintegrates
over time. If the driver tests open, you maybe out of luck.

A lot of folks remove them, no matter what, and replace
them with a headphone or small modern speaker. Some
folks use a penetrate like PB Blaster or Kroil to try and
loosen the driver and then a strap wrench like for a oil
filter. Over the last 100 yrs, the pot metal either expands
to weld itself to the base, or shrinks, cracks, and disintegrates.

Sorry, there is no solution that won't jeopardize the speaker
itself.


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 Post subject: Re: Music Master Base Disassembly
PostPosted: Sep Fri 10, 2021 11:17 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 6897
Location: Bossier City, Louisiana
A lot of the 20shorns had a pressed on metal cover.
They can be removed by carefully prying around the "lip", working slowly around with a screwdriver--good luck!

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http://pages.suddenlink.net/davesradios/


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 Post subject: Re: Music Master Base Disassembly
PostPosted: Sep Fri 10, 2021 11:31 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 1125
Location: Bristol TN 37620
OP

Is your driver pot metal, or does it have a steel cover?
I could be wrong, and Dave could be right.


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 Post subject: Re: Music Master Base Disassembly
PostPosted: Sep Sat 11, 2021 12:38 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 16896
Location: S. Dartmouth MA 02748-1225 USA
Last time I looked at my Music-Master horn, it has a steel base cover held on by several copper rivets "bashed" into the cast iron housing and squished across the steel cove. I don't know what is inside as it works perfectly.

How ever, if you have this copper rivet base. I would find the center of the rivet and start with a 1/16" drill slowly and ON CENTER. careful not to drill through the cast base but it is a small hole. Should be able to tell when past the copper rivet.

Then go to a 3/32 bit, then to a 1/8" if the head still does not come off got to 3/16" orf larger. Be careful once at the larger size the bit can bite so it has to be "blunted" so it does not grab or a bit ground for soft metal. Once the heads are off the the cover is removable...

So how to refasten, silicone glue if one wishes or check out where the rivets were, the holes may be threaded, if not thread them and use oval head screws. With a thick felt on the bottom, done...

Chas

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 Post subject: Re: Music Master Base Disassembly
PostPosted: Sep Mon 20, 2021 5:49 pm 
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Joined: Apr Tue 24, 2018 6:12 pm
Posts: 60
Location: Charleston, SC 29410
I kindly thank the responders! So last weekend my friend and I took a look at two Music Master bases. One had copper rivets that we were able to carefully drill out. The other base had no rivets so I don't know what the driver looks like or is made of but I suspect most of the drivers are screw-on Music Master drivers. Anyway, the base that we drilled off the rivets was never opened and had no driver! We suspect it was a model and not one that was sold but we don't know. We do know though that we were the first to open it.
The base in question Ohmed out nicely, can't remember off-hand what the Ohm value was but it works so we will probably leave it alone.
I was fortunate enough to purchase a Music Master driver that screwed right into the threaded pipe for the base that had no driver installed. Got lucky with both of these.
Thanks again for the help!
Jim Houston
Charleston, SC


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 Post subject: Re: Music Master Base Disassembly
PostPosted: Sep Mon 20, 2021 6:18 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 16896
Location: S. Dartmouth MA 02748-1225 USA
Jim,
Be a BIG help to the ARF readers if you could take several images of both these Music Master bases. Covers removed, threads on the base.

Use the ARF image posting utility so the images will never go away.

Music Masters horns are still being found some seem to survive, but cords fall off. So how to get them apart is important. BTW how did the cover get re-fastened after drilling out the copper rivets?

Chas

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