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 Post subject: Mic for V-M tape recorder--FIXED!
PostPosted: Jan Wed 11, 2017 2:13 am 
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Joined: Jan Sun 06, 2008 3:28 am
Posts: 3851
Location: Richmond, VA
What would be a decent, but reasonably priced, current microphone for the Voice of Music model 700 tape recorder? I picked up a V-M bullet mic made for it, but it was quite dead, and I don't want to waste more money on probably dead vintage mics.

Any high impedance dynamic mic will supposedly work.

I don't think I would use it much, but would like to have one on hand.

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Last edited by Ed Morris on Jan Tue 31, 2017 12:58 am, edited 1 time in total.

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 Post subject: Re: Mic for V-M tape recorder
PostPosted: Jan Wed 11, 2017 2:29 am 
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Joined: May Sun 08, 2011 8:52 pm
Posts: 411
Location: Bay City Mi
I just bought a couple mics from RS for my VM 749, I think I paid 20 bucks a piece for them , but they are nice with the wind screens , they sound real good when recording.


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 Post subject: Re: Mic for V-M tape recorder
PostPosted: Jan Wed 11, 2017 3:37 am 
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Location: Richmond, VA
This one?

https://www.radioshack.com/products/unidirectional-dynamic-mic

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 Post subject: Re: Mic for V-M tape recorder
PostPosted: Jan Thu 12, 2017 3:14 am 
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Joined: May Sun 08, 2011 8:52 pm
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Location: Bay City Mi
not sure if that exact one , I bought mine about 5 years ago, but looks like the ones I got , they work fine on my VM.


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 Post subject: Re: Mic for V-M tape recorder--FIXED!
PostPosted: Jan Tue 31, 2017 12:58 am 
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Joined: Jan Sun 06, 2008 3:28 am
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Location: Richmond, VA
Although I did pick up a NIB high impedance microphone on eBay for $3.00 ( :D ), I really wanted to see if I could fix the OEM mic from Voice of Music. After a lot of effort and study, I discovered that the cap is just a pressure fit, although it appears that an adhesive may have been applied at the factory when new. The cap can be worked off with a small blade screw driver.

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VMmic2.jpg
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When I got the mic disassembled, I found one of the wires loose, although I may have done that removing the cap. The shell is also filled with cotton wadding. I removed the retaining ring that holds the element in the cap, but the element appears to be glued into the cap, so I didn't try to remove it.

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VMmic3.jpg
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I thought the crystal or ceramic element might be dead, but I connected the two terminals to my signal tracer and found it was working fine. But when I reassembled the mic, it didn't work. I found the positive terminal was shorting against the mic's shell, which killed it.

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VMmic5.jpg
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I soldered new leads and reassembled the mic after bending the positive terminal away from the edge of the cap.

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VMmic6.jpg
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VMmic7.jpg
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I haven't finished restoration of the VOM tape recorder yet, but I tested the mic again with the signal tracer, then tried it in the microphone input of an amplifier and it seems to be working well.

Attachment:
VMmic.jpg
VMmic.jpg [ 60.7 KiB | Viewed 321 times ]

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