BreezeCC
2 posts
Nov 20, 2013
3:14 AM
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Anybody have a good method for testing old crystals besides installing them in a microphone one at a time?
I'm a long time CM user, but I acquired a spare JT-30 shell and want to un-retire an old crystal. I have 4 old ones (two 151, one 101, one 127) in a box. I do remeber that they all worked to varying degrees (some weak some strong), but stupidly I did not write down which was which.
I have seen Greg H (Blows Me Away) post somewhere that he checks them by using test leads direct to an amp. Greg, if you read this, can you elaborate just a bit.
Last Edited by BreezeCC on Nov 20, 2013 3:15 AM
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Greg Heumann
2470 posts
Nov 20, 2013
10:30 AM
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That is exactly what I do. A microphone cable with a 1/4" at one end and alligator clips on the other. You can pick up and cup an element with no shell required.
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***************************************************
/Greg
BlowsMeAway Productions
See my Customer Mics album on Facebook
BlueState - my band
Bluestate on iTunes
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MP
2999 posts
Nov 20, 2013
12:25 PM
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I think Greg had once mentioned never to test a crystal w/ an ohm meter because you could fry the crystal? Is that right Greg?
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i still have a little Hohner stock for reed replacement in three common keys.
when these are gone i'm out of the biz.
click MP for my e-mail address and more info.
Last Edited by MP on Nov 20, 2013 12:25 PM
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BreezeCC
3 posts
Nov 20, 2013
2:41 PM
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I had already read several places about not measureing crystals with a meter.
Greg, does it need to be mic cable? I don't think I have any mic cable with a 1/4" plug on one end - only instrument cable. If it does, I am sure I can find a few feet of scrap mic cable and a spare 1/4 lug and fire up the soldering iron.
If it does need to be mic cable, can you tell me which conductor goes where on the 1/4" plug?
In either cable case which conductor goes where on the crystal (using alligator clips of course)?
Thanks Greg.
Last Edited by BreezeCC on Nov 20, 2013 2:41 PM
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Barley Nectar
190 posts
Nov 20, 2013
6:43 PM
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you can use an instremunt cable. Just cut off one 1/4" plug and replace with a set of alagator clips.Put the clips on the element contacts and plug the cable into an amp. Polarity does not matter...Bn
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blueswannabe
355 posts
Nov 20, 2013
7:33 PM
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Use the alligator clips. That is the best way. Direct evidence of what you're dealing with.
Ohm readings dont tell you anything about tone or strength for that matter.
Last Edited by blueswannabe on Nov 20, 2013 7:34 PM
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