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 Synchronous vibrator repacement

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frankradio1



Posts : 4
Join date : 2010-10-17
Age : 81
Location : Sunny Southern Illinois

PostSubject: Synchronous vibrator repacement   Sun Oct 17, 2010 8:34 am

Hello,
I have a couple of 6 volt radios with bad synchronous vibrators. Is it practical to replace a synchronous 6 volt vibrator with a regular vibrator and diode rectifiers? Other than changing the socket would there be other problems? I have several good regular 4 pin vibrators, and good synchronous seem hard to come by.

Tom Ackerman
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burnt fingers



Posts : 70
Join date : 2010-10-12
Location : New Hampshire

PostSubject: Re: Synchronous vibrator repacement   Sun Oct 17, 2010 10:28 am

Nope, thats a common swap. Most of the time I use a 4 pin SS vibrator unless the customer likes the classic vibrator sound. In my prewar Buicks I went with a real vibrator.

Carl
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Dave McClellan



Posts : 7
Join date : 2010-10-13

PostSubject: Re: Synchronous vibrator repacement   Sun Oct 17, 2010 12:22 pm

I do that all the time, since I collect 6 volt farm sets. I have a boat load of NOS/good 6/12 volt non-synchronous mobile radio vibrators (5 pin) that are otherwise useless. I open up the bad 6-pin synchronous unit and insert the guts of the good non-synchronous unit and tack the 1N4007's inside the vibrator case (negative ends to the vibrator pins, IIRC). That way, no changes to the radio are needed. I leave the buffer cap the same value (but replace it).

This works OK, but I have NOT done any long term testing or compared the hum/noise level. It is also not obvious if the buffer cap value should be changed in this case. I suppose the only way to tell would be to attach a scope and try various values.

This also works for the hard to find 7-pin SPLIT REED units used in the 6-volt Airline Movie Dial.
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