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IBM/ITR Master relay

neighmond

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Jan 31, 2003
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If anyone could spare one of the older large sized winding/slave advance relays in 24 volts, I would be very appreciative-if they have more than one I would dance in the street!
 

eskmill

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Aug 24, 2000
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neighmond, The "master relay" or R-1 is of two varities made for 24 volt service.

The most common IBM/ITR R-1 used in US domestic impulse wind master has an alternating current relay coil, and usually has a copper dampening ring around the electromagnet core. The actual relay has heavy-duty contacts. The relay was generally held by wood screws on rubber gromets because they tend to be "buzzy."

A similarly made relay but with a DC only coil was used on IBM/ITR master clocks as R-1 on those made to be used with a local DC battery source.

On many, R-1 is replaced nicely with a noiseless solid-state relay of appropriate capacity.

It is important to replace R-1 with the proper type.
 

neighmond

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Jan 31, 2003
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It had a DC one way back when I scrounged the box, and I found a small Potter Brumfield one that is AC that works after some minor rewiring but it is at the end of its life (was old when I found it.) I got a real nice filtered power supply from the telephone company that has both rectified and AC so either will work; the relay is in a glass fronted case with five other ones so that was why I was hoping someone would have one that would look pretty close.
 

paradise

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Jun 24, 2007
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florida
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Neighmond I have about a dozen old relays but without more to identify which I don't know if I can help. If you could contact me with more info and maybe a picture I will be glad to check through what I have. My email is paradiseclocks@cfl.rr.com.
 

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