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Post by neophone on Oct 10, 2006 5:30:18 GMT -5
Gents,
I'm going to be checking my Granada's horn for air leaks this Weds. If I find any leaks, what's best to seal them? Apart from my worn out sound-box I think maybe I'm getting some sound loss from the horn itself (After hearing a certain magnificent Consolette this past week-end! ;D).
Regards,
J.
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Post by Matt Brown on Oct 10, 2006 12:13:25 GMT -5
John,
I've sealed a number of ortho horns, and here's what I've done:
- a coat of one of the following will usually seal up the wood pretty well:
- a mixture of glycerin and ethyl alcohol.
- shellac
I've used both, and to my ears both do the job. Don't be stingy with it - really lay it on thick, and let it run back into the places you can't reach. For a Granada, take the horn out and do this - that way you can move the horn around to get the glycerin/shellac to run inwards to where you can'e reach.
- as for cracks, spaces, seams, etc., I use caulk - lay a bead down along the seam, and use your finger to smooth it out and get it in all of the seams,cracks, etc.
- Gotta make sure that the seal between tonearm and horn is tight - in fact, you might want to check this spot before you try sealing the horn with glycerin/sheallc/caulk. If the rubber ring that sits at the base of the tone arm is worn/missing, you'll have to find something else to put in there. I've used a variety of things, from new rubber rings that I made, to a ring of very thick felt. Idon't think it matter what is used, as long as it doesn't interrupt the path of the sound, and as long as it seals the tonearm to the horn.
Hope this helps.
Matt
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Post by neophone on Oct 10, 2006 16:52:28 GMT -5
Matt,
You mean basically coat the entire horn structure? On the inside? Boy, that's a big job I'd guess. I'll check the joints and the taper-tube connection first. Most of my problem in the soundbox itself, but I figure the horn itself maybe contributing.
I'll let you all know how I make out tomorrow night.
Regards,
J.
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Post by Matt Brown on Oct 10, 2006 18:12:36 GMT -5
John,
Yes - coat the interior of the horn in it's entirety in either shellac or glycerin/alcohol.
I had been using the glycerin/alc mix, but this past year I sealed the horn of a Vic Revere using shellac - man was that thing LOUD! Unbelievable sound! (Of course we have hard wood floors, which helps).
Matt
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Post by neophone on Oct 10, 2006 19:14:26 GMT -5
Matt, Thanks, I'll have to do that as soon as I can clear out a space  Regards, J. |
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Post by orthophonic on Apr 19, 2007 11:17:59 GMT -5
I have used some plastic wood in a 9-40 that I bought. The horn was split along the side and it did a very nice job; it sounds great now. You can get it in dark colors too, if you look around for it. By the way, for some of the harder to get stuff that you need for cabinet stuff, the Woodworker's Shop is great! It is run by an outfit called Klingspor that deals in sandpaper and I wonder if they are the ones that used to make the Klingspor phonographs. Like mine, that is not a real common name. . .
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