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Rode NTK mic with replaced TUBE (NOS) - mp3 examples here!!!

Discussion in 'Pro Audio Equipment' started by gilbert, Jul 27, 2005.

  1. gilbert

    gilbert Guest


    I own a Rode NTK mic, and am not that happy with the sound. It's brittle, and not very focused.

    I would love to get a better mic, but the budget is a little restrictive. So instead, I ordered a replacement tube for the mic, in the hope that I could improve the sound.

    The tube I chose was a NOS Philips E88CC/6922 SQ from Holland.

    I recorded two test tracks - one with the old tube, and then the new to compare any sound difference (which I believe is very apparent).

    Here's the gear I used:

    - Maton Australian Series Jumbo Acoustic Guitar (with month old strings)
    - Rode NTK mic
    - Sebatron vmp-2000e preamp
    - LynxOne audio card
    - Cubase SX (24bit, 44.1k project)

    Here's what I did:

    - I set up the mic (with the stock standard Chine tube) through the pre, and left them both turned on for about 45mins, to allow the tubes to warm up.
    -I set the preamp controls to transparent, neutral settings, with no eq and low tube gain.
    - I set the mic up a foot away from the guitar, pointed between the soundhole and beginning of the neck.
    - I recorded a basic strumming pattern.
    - turned off the mic, and replaced the tube with the NOS Philips one.
    - set up the mic in exactly the same position, turned the mic on, and left it to warm up for 45mins.
    - repeated the recording process, same strum, same position, same distance from mic.

    I applied no compression, eq, and did not normalise the files, so you can hear volume diferences.

    I coverted the 24bit files to 16bit with dither etc.

    I then used Lame to convert the tracks to 320k mp3s

    I'm not going to say what I think the differences are, because I want to hear what you all think!

    I have never been up close and personal with a highend mic, like Nueman etc. How does the NTK with the new tube compare?

    Here are the links:

    Philips - http://people.aapt.net.au/~celebritymusic/TubeX.mp3

    Chinese - http://people.aapt.net.au/~celebritymusic/TubeY.mp3

  2. Reggie

    Reggie Distinguished Member

    Dec 20, 2004
    Hey I think you're on to something. Phillips wins my ears.

    I'm still waiting to hear about someone doing some tube swapping with a Brick; see what kind if sonic differences it makes like this. Anyone?
  3. David French

    David French Distinguished Member

    Jun 19, 2002
    Hmmm, darkened that little bastard right up, didn't it? 8)

    Perhaps you should repost these for blind listening, i.e., without labels and slating.
  4. TornadoTed

    TornadoTed Guest

    There is deffinatley more high end sheen with Phillips tube. It seemed quite a bit smoother with not as much low mid congestion to my ears as well.
  5. Sork

    Sork Active Member

    Oct 26, 2004
    Home Page:
    How did you take out the stock tube? I'm trying to change mine, but I don't want to drag and pull, afraid to ruin the whole thing! It doesn't say anything about it in the manual...
  6. bap

    bap Guest

    I just tried listening to these samples but they seem to be unavailable now. I replaced my stock tube in the K2 with a Mullard NOS and like the difference as well.

    Sork, if the NTK is like the K2 then all you need to do is remove the little plastic support bracket that holds the top of the tube and then pull the tube up off the pins. My new tube was a little tighter going in than the original was coming out.

    The K2 uses a 6922 twin-triode valve [tube]. The NTK is probably the same but be sure to check your documentaion so that you get the right type for replacement.

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