Need imput on harp mic. element

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Re: Need imput on harp mic. element

Postby Pastor Harmonica » Tue Dec 15, 2009 9:33 pm

Ok Guys, I just finished the harp mic. It looks great and sounds even better. great deep tone and tight top end. Very little feed back (you have to be dead in front of the amp.) I will send pictures and a video as soon as I can. Thanks to everyone for your ideas and imput.
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Re: Need imput on harp mic. element

Postby bottleneck » Sun Dec 20, 2009 8:58 pm

well ,what kind of element did you end up using??

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Re: Need imput on harp mic. element

Postby Pastor Harmonica » Mon Dec 21, 2009 8:21 pm

Hey Bottleneck, I used a cm element out of an old RCA voice mic. that some guy gave me. It really is quite a good piece. when you cup it heavy it gets that muddy sound but yet when you relax the cup it's crisp and clean. Good high end and bottom. The only problem is that if it goes bad I have no replacement due to no markings on the element or the old housing. So I guess I got a one of a kind.
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Re: Need imput on harp mic. element

Postby jbone1 » Tue Dec 22, 2009 5:23 am

my cm's have had those same qualities pastor. it may be a gardfen variety 99a- or b- 86 element. fairly common at this point. ebay usually has several for sale.

i have just recently revisited my cm powered bullet, and i really like what i'm getting. while it has no volume control- my crystal and dynamic mics do- it's still a great sounding mic and cuts through well in either amp. fat bottom with a good cup and more mids with a loose cup. lots of output.

enjoy that mic pastor!
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Re: Need imput on harp mic. element

Postby bottleneck » Thu Dec 24, 2009 12:05 am

i've been using my CR/CM's a lot more lately too.i still like my astatic elements,but the shure ones are bullet proof and i don't have to worry about them.ever since i got good gaskets i've favored them.(that way i can save my few remaining 151's too)

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Re: Need imput on harp mic. element

Postby Pastor Harmonica » Thu Dec 24, 2009 2:43 pm

When it comes to gaskets I had no luck finding one that fit. Sooo I got a tube of silicone sealant and filled in the gap. It really works well. At least until I have to replace the element. But thats OK.
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Re: Need imput on harp mic. element

Postby gheumann » Thu Dec 24, 2009 11:10 pm

Mosta the RCA mics date back pretty far. What is the model of that element? 99A/99B86 are the standards, most popular and can be excellent. But there are a few 99H86 white label controlled magnetics, as well as 99H86 white label controlled reluctance elements out there that are more rare and absolutely wonderful.
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Re: Need imput on harp mic. element

Postby Pastor Harmonica » Fri Dec 25, 2009 1:19 pm

Well Gheumam, I got the slightess idea what model, there is nothing writen on the element at all. All I know that it was a standard voice mic. when I started. I do have the specs. though as follows: Type: Uni directional, Impedence: (+/-30%) :600ohms, Sensitivity: (-76db+/-3db at 1 KHz), Frequency Response: 80-12,000Hz. Anyway it sounds awsome.
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Re: Need imput on harp mic. element

Postby gheumann » Sat Dec 26, 2009 10:29 pm

OK, tht sounds like a newer element. Freq. response of CM's didnt go that high. Also, at 600 ohms that is a low impedance mic. Did you set it up for low Z, or with an impedance matching transformer to make it high? If not, you aren't getting all that you might from it....
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Re: Need imput on harp mic. element

Postby Pastor Harmonica » Mon Dec 28, 2009 11:58 am

Hey Gheumann, I didn't do anything to at all. Just ran it through a on/off switch into a 1/4 inch jack. It still sounds great.
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Re: Need imput on harp mic. element

Postby gheumann » Tue Dec 29, 2009 5:40 pm

Pastor Harmonica wrote:Hey Gheumann, I didn't do anything to at all. Just ran it through a on/off switch into a 1/4 inch jack. It still sounds great.


OK - the specs you posted say it has a 600 ohm impedance. That is low impedance. There is an impedance mismatch between the mic and your amp and it is at least worth trying it with an impedance matching transformer. The way you have it wired, it is better than a standard modern low impedance mic - the way they're wired most people only end up getting half the signal if they cable it straight to an amp. You're getting 100% of the signal. However both the amp and the element were designed to operate within a range of impedance - and having them matched is USUALLY the best. It is fairly easy to try this and you can't hurt anything - so on the chance your mic could be even better - I suggest you try an impedance matching transformer. If you get a typical external one with XLR female at one end and 1/4" male at the other, then you'll want to wire your element to a cable with an XLR male plug. The signal should be on pins 2 and 3. Pin 2 should also be connected to Pin 1 and the shield for proper grounding.

/Greg
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Re: Need imput on harp mic. element

Postby jbone1 » Wed Dec 30, 2009 2:49 am

pastor, greg knows from whence he speaks. i sent him a low-z e-v m43u early this year and he installed a transformer internally as i requested, put a correct value volume pot in it, and a screw-on connector, and it's one of my 3 all time favorite mics. it has seena lot of use this season and is like the energizer bunny- just keeps goin!
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Re: Need imput on harp mic. element

Postby Pastor Harmonica » Sat Jan 09, 2010 1:28 pm

Hey guys, I put in the transformer and only noticed a little difference. For the good though. Thanks Greg for your help. I will be using it today we have a gig this afternoon. I'll take some pics. soon and post them.
Peace to all, Ken
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Re: Need imput on harp mic. element

Postby DeFord Harp Slider » Sat Jan 09, 2010 3:06 pm

I'm just posting to let it be known that I have been coming to this thread since the beginning to see how this project works out..... Best wishes for he new decade and may everyone find the ultimate set up and tone that best suits them.
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