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Author Topic: EV664 microphone transformer  (Read 103 times)

DANCUARTAS

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EV664 microphone transformer
« on: March 25, 2023, 08:32:47 AM »

Hi everyone!!

I got this 664 from eBay, but is not working, it is in pretty good condition aesthetically speaking, but it doesn't work...

I opened it and it seems that someone replaced the transformer before (wiring color do not match and the heatshrink gave me some clues :P)


I have some ideas in mind, I tried to look up some replacement transformer and didn't find any.

I don't know too much about microphones, but:

1. Can I wire the capsule directly to the XLR and test if it is working fine and discard a bad capsule? is it in any way not recommended?

2. Can I wire an SM57 (4 wires) transformer instead of the original (6 wires)? I will leave this microphone in Lo-Z setting.

3. Anyone with a functioning 664 that tells me if this wiring is ok? any other solution maybe?




Thank you, awesome radio geeks!!!
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WA3SKN

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Re: EV664 microphone transformer
« Reply #1 on: March 25, 2023, 10:00:51 AM »

https://usermanual.wiki/Electro-Voice/ElectroVoice664AUsersManual539083.384552053.pdf

What impedance are you looking for?  Default is hi Z but is capable of 150 ohms.
What test eqpt do you have available?  What are you planning to use it with?

-Mike.
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DANCUARTAS

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Re: EV664 microphone transformer
« Reply #2 on: March 25, 2023, 01:04:50 PM »

https://usermanual.wiki/Electro-Voice/ElectroVoice664AUsersManual539083.384552053.pdf

What impedance are you looking for?  Default is hi Z but is capable of 150 ohms.
What test eqpt do you have available?  What are you planning to use it with?

-Mike.

Thank you for your answer!

I don't know much about impedance and how it will change the sound of it, but I think that low-Z is more universal than high-Z, am I wrong? I will use it with a USB interface for now
« Last Edit: March 25, 2023, 01:08:35 PM by DANCUARTAS »
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DANCUARTAS

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Re: EV664 microphone transformer
« Reply #3 on: March 25, 2023, 01:06:20 PM »

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