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 Post subject: Rattling sound in rebuilt Model K repro: a tip?
PostPosted: Tue Apr 02, 2019 6:44 pm 
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Victor IV
I've got both kinds of music--classical & rag-time.
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Question: I'm working on a Model K reproducer that is for my Fireside, all set up with a cygnet horn and the works. The reproducer was pretty stock when I got it, but looked to have been tinkered with in the past, namely the hole for the hinge block. I rebuilt it with new rubber gaskets and the original copper diaphragm. It plays but goes out of adjustment very easily, sounding buzzy or tinny like a disc machine with a bad gasket. I don't think the styli are bad--it plays without echoing--but there's a lot of brassiness in the sound that disappears when I drop in a Model C.

Are the K reproducers that temperamental? Is there a fix I should know about or do I need to get Mr. Medved, Markus, or Sitko on the telephone right away?


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 Post subject: Re: Rattling sound in rebuilt Model K repro: a tip?
PostPosted: Tue Apr 02, 2019 6:59 pm 
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Victor Monarch Special
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The stylus bars on a K are conformed to fit together at the ends. Are you sure they're in proper alignment?

Other than that, is the link tight enough through both stylus bars to prevent rattling?

Finally, have you experimented with tightening/loosening the compression ring? Make sure the diaphragm is centered so it doesn't touch the reproducer's body.

Good luck,
George P.


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 Post subject: Re: Rattling sound in rebuilt Model K repro: a tip?
PostPosted: Wed Apr 03, 2019 10:44 am 
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Victor III
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My impression of this situation is that the model K
reproducer just tends to rattle. This is because
one stylus bar and stylus is always riding along
with nothing to do but to sit there and rattle away.

It's just the design of the thing.

Chuck
"Sustained success depends on searching
for, and gaining, fundamental understanding"

-Bell System Credo


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 Post subject: Re: Rattling sound in rebuilt Model K repro: a tip?
PostPosted: Wed Apr 03, 2019 11:50 am 
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Victor V
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I have to disagree with you, Chuck. George mentions the linkage in his response, which I was going to mention, but he beat me to it. Most times, it's a matter of getting the linkage just tight enough to get the two bars tight enough on their ends against each other so they don't rattle. I had a K that was "rebuilt" and it rattled on for years and I stopped using it. One day when I knew more, I decided to take the thing apart and I started playing with the linkage, it takes some experiment and patience, but once you get it just tight and "right", there will be no rattle, or VERY little, not at all enough to be annoying. Another thing I've thought would help would be a tiny piece of rubber tubing (ie rubber gasket material) between where both bars would normally touch, I'm willing to bet that would eliminate it completely without the linkage bending / clamping.

Sean


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 Post subject: Re: Rattling sound in rebuilt Model K repro: a tip?
PostPosted: Wed Apr 03, 2019 2:41 pm 
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Victor VI
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Coincidentally I was talking to Mr. M. recently as he is rebuilding a K for me.

He tells me, "The secret to the Model K adjustment is to make certain the stylus bar holes are large enough.", and goes on to say that my K sounds almost as good as his model N now.

I would still say that generally the K is more temperamental than a C or H and the C or H normally sounds slightly better, the O or M and N of course much better yet. :monkey:


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 Post subject: Re: Rattling sound in rebuilt Model K repro: a tip?
PostPosted: Wed Apr 03, 2019 10:46 pm 
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Victor IV
I've got both kinds of music--classical & rag-time.
Joined: Fri Oct 06, 2017 11:39 am
Posts: 1322
Location: South Carolina
Thanks to all who responded. I haven't tried tuning it yet based on these suggestions but hope to get better sound in the future.


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