Vintage High Impedance Microphone- Electro Voice 630

Discussion in 'Amateur Radio Equipment Reviews' started by N8FVJ, Dec 10, 2019.

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  1. N8FVJ

    N8FVJ Ham Member QRZ Page

    Looking for a high impedance desk microphone for your vintage transceiver? Consider the Electro Voice 630 microphone.

    The EV 630 is a great sounding microphone for radio communications. The frequency response is 60Hz to 11000Hz. Output is a powerful 80 millivolts. Many high impedance microphone output about 50 millivolts.
    The frequency range has an approximate 2dB boost from 300Hz to 2kHz and another 2dB boost starting at 2.8kHz. This is great for clear & punchy audio with the low bass response. Some communications microphones have a frequency response from 300Hx to 6kHz that remove the bass. As for 6kHz, ham radios do not transmit higher than 6kHz AM and about 3kHz maximum on SSB. The Astatic D-104 is an example of a microphone with -2dB at 300Hz low response that removes the bass and a 10dB boost at 3kHz. Not a great sounding microphone for high quality transmitting frequency response.

    I find the EV 630 on eBay and with careful shopping are available for about $60. Look for the microphone large connector included as NOS costs about $35. For about $100 the desk stand with the microphone are available.
     
    Last edited: Dec 10, 2019
    KA2RRK likes this.
  2. WA3VJB

    WA3VJB Ham Member QRZ Page

    The "look" of the E-V 630 is pretty cool. Radio hobbyists might be competing to buy an example with harmonica players. The harp and a handheld mic like this are a good combination at a club or concert hall. Shure 520 among the most popular. They cup in the hand.

    For radio, I found a similar response from the now-vintage E-V 619, a high impedance dynamic that matches well with my Collins 32V2 AM transmitter. Integral desk stand, PTT bar that can be on the grip or in the base. Bought it new about 40 years ago, wow. They're still out there.
     
  3. N8FVJ

    N8FVJ Ham Member QRZ Page

    BTW- the EV630 is good for SSB use. The comment D-104 not good for high quality transmit frequency response only pertains to SSB use (my error not explaining well). I recommend the Astatic D-104 for vintage AM tube type transmitters. Into a 5 meg ohm load the D-104 plays to 150Hz without too much low frequency dropout. AM tube type transmitters need the 10dB high frequency boost for crisp sounding audio.
     
  4. AC0OB

    AC0OB Platinum Subscriber Platinum Subscriber QRZ Page

    For the price the Shure 450 Series II in high impedance mode is one of the better dynamic microphones for vintage gear and has a peaking response that seems well suited for AM.

    Pheel
     

    Attached Files:

    W1BR likes this.
  5. N8FVJ

    N8FVJ Ham Member QRZ Page

    Thanks for the 'heads up'.
     
  6. W9GB

    W9GB Ham Member QRZ Page

    ElectroVoice 630 was produced in 1960s.
    It was sold in both Low Impedance and High Impedance models.
    72FB4079-FB6E-4185-B768-7B43D2B23AE6.jpeg 842DE949-768E-43FC-B6AB-4A1AD598CEA1.jpeg
     
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