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Vintage Tape (Audio), Cassette, Wire and Magnetic Disc Recorders and Players Open-reel tape recorders, cassette recorders, 8-track players etc.

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Old 31st Mar 2012, 6:48 pm   #1
camtechman
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Default Correct Microphone For Sanyo MR-212 ?

I recently acquired a Sanyo MR-212 Mini R2R Taperecorder (Pic: #1) and after a bit of servicing it's working well.

However it didn't come with a microphone but I've seen a picture on the web of the unit with it's mic and this looks like a dynamic type.

I have quite a collection of mics, some crystal type & other dynamic types (of various impedances) but the audio quality from them varies. The one that gives the better result is a Sony F96 low imp type (about 200R).

From the circuit in pic #2 can anyone advise what impedance is the Sanyo MR-212 designed for?
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Old 1st Apr 2012, 2:46 am   #2
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Default Re: Correct Microphone For Sanyo MR-212 ?

Definitely low impedance and probably somewhere between 200R and 500R.
You're on the right track just trying various low impedance mics.

Cheers Tim
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Old 5th Apr 2012, 10:51 am   #3
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Default Re: Correct Microphone For Sanyo MR-212 ?

Cheers
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Old 7th Jul 2016, 10:55 pm   #4
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Default Re: Correct Microphone For Sanyo MR-212 ?

Some 4 years later.........The correct Sanyo mic is the HM-8 200 ohms and I've just acquired one !!

What's that saying about......."for those who wait"
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Old 8th Jul 2016, 8:41 am   #5
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Default Re: Correct Microphone For Sanyo MR-212 ?

I have also found that the quality of mikes supplies with budget tape machiens varies enormously. The no-name generic type ones and crystal ones (especially 1960s Acos and Thorn) seem to be the worst. Sony types are usually excellent.
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Old 15th Jul 2016, 4:33 pm   #6
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Default Re: Correct Microphone For Sanyo MR-212 ?

I've also acquired a Sanyo HM-28 mic which is 500R and it has a far better sound (voice & music) and so I've put the mic insert into the HM-8 and it's spot-on !

HM-8 (Left) HM-28 (Right)
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Old 16th Jul 2016, 1:12 pm   #7
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Default Re: Correct Microphone For Sanyo MR-212 ?

I love dynamic thinking!(and mics) well done
Gary
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Old 17th Jul 2016, 4:53 am   #8
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Default Re: Correct Microphone For Sanyo MR-212 ?

AC recording bias, plus a masterfully drawn schematic, that may lead some to believe it isn't DC erase.
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Old 18th Jul 2016, 1:15 pm   #9
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Default Re: Correct Microphone For Sanyo MR-212 ?

Can someone advise, each time I read that statement it seems to be praising it but the next time, it appears not to be....which is it?
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Old 18th Jul 2016, 1:22 pm   #10
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Default Re: Correct Microphone For Sanyo MR-212 ?

Hello Camtechman I have the cassette/radio version of this always liked the gear change mech control.............AC/DC bias dunno
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Old 18th Jul 2016, 1:56 pm   #11
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Default Re: Correct Microphone For Sanyo MR-212 ?

A casual glance at the wiring diagram suggests that the erase head is driven from the bias oscillator T6. However, on closer inspection, it is simply connected across the bias oscillator's switched supply.
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Old 18th Jul 2016, 2:26 pm   #12
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Default Re: Correct Microphone For Sanyo MR-212 ?

Not that it's going to be seriously used, the results are quite pleasing, so I'm a happy bunny anyway.
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