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Road Devil Mic

hypersight

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Joined
Dec 26, 2002
Messages
400
Location
Canada
I have an Astatic Road devil mic (The one with the red case) wired to a President Lincoln 2. I'm getting some reports that my audio sounds a bit tinny and high pitched.
Are there any modifications that I can do to this mic to tame the high pitched tinny audio?
 

jassing

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Jan 31, 2012
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223
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Shelton, WA
Well; I think the starter question is "have you tried the stock mike?".
Try adjusting the gain down.
Are you running any "audio toys" (feedback/echo/etc) (disable them,no one likes to listen tot hem anyway)
Anything else 'not stock' (ie: radio -> antenna, not radio->gizmo->antenna)
 

prcguy

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Jun 30, 2006
Messages
7,826
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So Cal - Richardson, TX - Tewksbury, MA
Can you open the mic and post a picture of the cartridge inside? If its the typical Astatic crystal cartridge then you can place a simple disc ceramic cap across it and mellow out the highs. I did this to a mobile D104 type and got it sounding pretty good. If you have the same type cartridge I will open my mic and get the cap value I used.

I have an Astatic Road devil mic (The one with the red case) wired to a President Lincoln 2. I'm getting some reports that my audio sounds a bit tinny and high pitched.
Are there any modifications that I can do to this mic to tame the high pitched tinny audio?
 

138BG

Newbie
Joined
Jul 10, 2019
Messages
3
Any fixes/replacement for the scratchy PTT switch? Rarely use mine because of it. Have used contact cleaner and lube on but never lasts long....
 

prcguy

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So Cal - Richardson, TX - Tewksbury, MA
Its hard to find exact replacements unless the mfr can supply it. The industry standard for contact cleaners is Deoxit R5. Every recording studio has it on hand and it works better and lasts longer than any other cleaner/lube out there. If all the parts to the switch are there and they make some contact, Deoxit will usually fix it.

Any fixes/replacement for the scratchy PTT switch? Rarely use mine because of it. Have used contact cleaner and lube on but never lasts long....
 

hypersight

Member
Premium Subscriber
Joined
Dec 26, 2002
Messages
400
Location
Canada
Can you open the mic and post a picture of the cartridge inside? If its the typical Astatic crystal cartridge then you can place a simple disc ceramic cap across it and mellow out the highs. I did this to a mobile D104 type and got it sounding pretty good. If you have the same type cartridge I will open my mic and get the cap value I used.
Thanks for your reply prcguy. After prying the heck out sealed plastic case the mic was encased in, it appears it's an electret mic, not a crystal cartridge.
 

Attachments

prcguy

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Jun 30, 2006
Messages
7,826
Location
So Cal - Richardson, TX - Tewksbury, MA
Yea, an electret condenser is a different animal and would need a different approach. Looking at a schematic on line I see there are two op amps in the mic, each with an R/C network in their feedback loop. If its accessible I would try removing C1, which is a 470pf cap. That should lower the high frequency gain of the first op amp and would let you know if its going in the right direction.

If that lowers the highs it might be enough and if not you could diddle the value of cap in the second op amp which is C4 and 4700pf. In both cases you could remove just one lead of the cap to see how it sounds,

Thanks for your reply prcguy. After prying the heck out sealed plastic case the mic was encased in, it appears it's an electret mic, not a crystal cartridge.
 
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