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Author Topic: nak cm300 to run on 48v phantom  (Read 976 times)

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Offline scrtaper

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nak cm300 to run on 48v phantom
« on: March 18, 2017, 11:46:32 PM »
so ive been looking at the schematic for nak cm300 bodies and im curious if anyone has a mod for these to run from a 48v phantom supply or if i just have to do some experiments and post my findings? any help is appreciated thanks
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Offline ArchivalAudio

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Re: nak cm300 to run on 48v phantom
« Reply #1 on: March 19, 2017, 03:24:34 AM »
Chack out the team Nak threads:
http://taperssection.com/index.php?topic=164175.0;topicseen

The P48 mod does make a big difference in the sound of the mic.  It's not just a phantom power mod, but improves the mic sound as well.  Much more fuller sound, with deep bass and high's recessed.   

I recorded a song with each mic, the Sank P48 and the OEM,  using Shure FP24 > Sony M10, prior to sending them out to Steve.
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Offline Hypnocracy

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Re: nak cm300 to run on 48v phantom
« Reply #2 on: March 19, 2017, 12:52:13 PM »
Wastib62 does a phantom mod with 6db gain over stock for any Nak/primo clone...those mic's need lots of clean gain an the mod addresses that improving the sound IMO
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Offline Jerseyboy

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Re: nak cm300 to run on 48v phantom
« Reply #3 on: March 19, 2017, 08:01:04 PM »
Wastib62 does a phantom mod with 6db gain over stock for any Nak/primo clone...those mic's need lots of clean gain an the mod addresses that improving the sound IMO

Could someone explain the difference between the Sank & JB mod? I assume both only use the cap section rather than the whole mic body.  I have a mint 3 pack of cm300s and I'm torn on doing the mod on this set...it's literally brand new from a Nak collector.  I purchased another set on ebay, but they lacked the depth & clarity of my mint set.
Can these mods revive a tired set of cm300s?  I like the fact that sank kind of matched the mics. Any help appreciated. I'm waiting to pull the trigger on the mod.

Offline Hypnocracy

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Re: nak cm300 to run on 48v phantom
« Reply #4 on: March 19, 2017, 08:36:05 PM »
PM Walstib62 for the actual info...

The JB Mod I had was a Phantom Mod...battery and switches removed and a preamp board installed...the body shortened...nothing done on the capsule-barrel end (IICR)

He also does a version of the Ole Franken Mod I've seen referred to as a JB Mod
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Offline admkrk

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Re: nak cm300 to run on 48v phantom
« Reply #5 on: March 20, 2017, 02:44:44 AM »
I have a mint 3 pack of cm300s and I'm torn on doing the mod on this set...it's literally brand new from a Nak collector.  I purchased another set on ebay, but they lacked the depth & clarity of my mint set.
Can these mods revive a tired set of cm300s?  I like the fact that sank kind of matched the mics. Any help appreciated. I'm waiting to pull the trigger on the mod.

I have been meaning to send Sank a pair for years, money and convenience never seem to match up though. Aside form other things, I would send a set in the worst shape. I have a few with battery crud, that are useless to use with batteries.

There are many reasons a more "tired" set could sound worse, assuming you used the same caps. The most likely reason being a poor power supply. That is just my opinion, so take it for what it is worth.
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Offline down2earthlandscaper

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Re: nak cm300 to run on 48v phantom
« Reply #6 on: March 20, 2017, 03:21:34 AM »
I finally pulled the trigger and just had the Sank mod done on my cm300's and on my Tascam PE120's (Basically a Nak300 clone)
The mod is done to the full body (No "chopping")
I think the sound is better, and it definitely is way more convenient than sourcing and taping together two 6 volt batteries. I don't care that they are still full bodied because the 300's really aren't suited for  >:D >:D

That all being said, I did also happen to aquire a set of chopped 700's that walstib did at some point in the past and I am very happy with those as well!

Here is an excerpt from an email where Stephen explained the mods to me (at this time I was considering modding both my cm700's and cm300's.) I don't think it's my place to list his pricing so I x'd those out, but everything else from the email remains intact, so I hope this will be helpful and informative.

Stephen Sank <varacoustic@yahoo.com>
   
7/15/15
   
to me
Know right away that I will NOT do "chops" on the Nak/Primo/Teac/Tascam mics.  I consider it a terrible thing to do to them, plus I don't have time for that sort of custom metalwork.

No problem doing phantom power mods, though.

Normally, phantom mod for the CM100/300 is $xx each.  However, if you want to keep using the CP4 shotgun capsule, that adds a major wrinkle.  The normal mod involves a reconfiguration of the fet head amp, which then gets hardwire-connected down to the output section in the main body.  The CP4 has it's own FET head amp built-in, so maintaining useability of CP4 means not only mod'ing the additional head amp inside the CP4, but also coming up with an inline 2-pin connector, so that the normal preamp head can be unplugged to then plug in the CP4.  So, a "with CP4" phantom mod would be $xxx per mic set.

The CM700 mod costs are the same, with the one additional wrinkle:  If you have/want to use the CM700 with both it's normal AND it's -15dB attenuator heads, it brings up the same issue as with the shotgun capsule, as the -15dB head is a whole alternate head amp.  So, $xx normal, $xxx if you want to maintain swap-ability of straight + -15db heads.  And if you get CP703 shotgun capsules with them, it will add the same amount.

Whatever iteration of the above, my phantom mod will actually improve the sound a bit & will drop the noise floor some, as I allow the fet head amp to run at 20VDC, and I upgrade the output line dc blocking cap that feeds the signal to the output transformer.

Stephen Sank, Owner
Talking Dog Transducer Co.
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Offline Hypnocracy

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Re: nak cm300 to run on 48v phantom
« Reply #7 on: March 20, 2017, 03:57:05 AM »
Thinking again about my JB Mod.....I seem to recall that there was a wire to the barrel...and CP-4 was not an option...just like the Sank mod
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