puri
63 posts
Apr 21, 2013
10:20 PM
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It's kinda make sense to think that way. The only mic that I have at moment is ev638, can't remember the reason why I bought it in the first place. It's omnidirection and I have to be aware of my position or how I cup it all the time otherwise I'll have some feedback. The problem is manageable, ofcourse, by cupping technique & position but will it be easier with the bullet? Is it the time that I should get myself a decent bullet mic? I play traditional blues mostly.
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dougharps
388 posts
Apr 21, 2013
10:34 PM
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Yes, omnidirectional mics (including green bullets that are omni as well), can create feed back easier than cardioid or hyper-cardioid pattern mics, since it is easier to keep a directional mic from picking up the sounds from the amp that will create the feedback loop. Omnidirectional mics pick up sound from all over, and are more susceptible to this problem.
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Doug S.
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5F6H
1615 posts
Apr 22, 2013
3:16 AM
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A 638 is a "decent mic". I love them, perhaps less raunchy that some others, good output with a middle of the road tone. Paul Lamb uses one at the moment.
I have never noticed a particular problem with feedback (compared to crystals & other dynamics), whether cupped tight, or loose/open.
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jbone
1241 posts
Apr 22, 2013
5:44 AM
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If you can cut gain and highs on your amp feedback is less likely as well. I've also found recently that a Lone Wolf harp delay pedal helps resist feedback.
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puri
65 posts
Apr 22, 2013
7:20 AM
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Hi Mark, actually this question popped up while I was messing with the amp - swapping parts in & out trying to find the tone that I like and every now & again I'll have this sort of overtones/feedback problem. It could be the amp's back that is open a little too much or something to do with the input signal or the mic's element or a bit of everything. I'm kinda trying to eliminate the causes of the problem so I can address it at the right spot.
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Greg Heumann
2107 posts
Apr 22, 2013
7:31 AM
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As Mark said - in the real world it doesn't make much difference. If you pick up and hand hold the mic, whatever directionality it had flies out the window.
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/Greg
BlowsMeAway Productions
See my Customer Mics album on Facebook
BlueState - my band
Bluestate on iTunes
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puri
66 posts
Apr 22, 2013
7:36 AM
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Ha! thanks, Greg. That actually helps, going back to the amp now.
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5F6H
1616 posts
Apr 22, 2013
7:51 AM
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Hi Puri, Have you tried a 12AT7/12AY7 in V1?
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puri
67 posts
Apr 22, 2013
8:42 AM
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Mark, yeah, I've tried it before and in the end I still prefer ax because it has more life to it but there's a trade off I guess.. I'm now back to 1*10 with a nos brimar ax tube which is a pretty good match. When I was using 2*10 an EH ax tube did a better job though. Is it worth try the 5751? I saw a GE today and it cost about 700? (16GBP) might buy it someday.
Last Edited by puri on Apr 22, 2013 8:43 AM
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5F6H
1617 posts
Apr 22, 2013
8:49 AM
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I like 5751 in V1 on a good few amps, but not so much in that design, still worth a try I guess. I preferred a Phillips 12AT7, others preferred EH12AY7.
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puri
68 posts
Apr 22, 2013
8:57 AM
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Thanks, Mark. I better trust the one who designed it, EH12AY7 seems like a good idea, I'll try it in a couple of weeks.
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dougharps
389 posts
Apr 22, 2013
12:13 PM
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@puri
Yes, all green bullets and JT30s are omnidirectional.
To clarify my post above, I was addressing omnidirectional mics versus cardioid or hyper-cardioid mics and likelihood of feedback in general, not when you cup the mic.
I was not specifically addressing the EV 638 as Mark did in his first response.
Omnidirectional mics are more likely to pick up stray sounds that will lead to feedback because they are made to pick up sounds not directly in front of the mic. The cardioid mic was designed to pick up only on-axis sounds in order to reduce feedback problems. Many cardioid mics boost low frequencies through the proximity effect.
If you see a singer out in front of the PA working the crowd and there is no feedback, it is likely (s)he has a hyper-cardioid vocal mic. If an acoustic band is sharing an omnidirectional condenser mic on stage, the monitors are likely low or off to avoid feedback, because a hot omnidirectional mic will pick up sounds from a far wider area and feed them back through the monitors.
The above are my opinions & practical knowledge about mics that I believe are correct.
However, if you are looking for specific harp mic advice related to feedback problems, I would pay attention to Mark's and Greg's opinions more than mine, because they are both very knowledgeable on this subject, and their points are specific to that issue and not general mic information.
I trust and rely upon their knowledge about harp mics and amps.
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Doug S.
Last Edited by dougharps on Apr 22, 2013 12:15 PM
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