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General Discussions => Brewery => Topic started by: Gene Pink on February 16, 2017, 08:51:09 PM

Title: Bozak/Kenyon transformer ID
Post by: Gene Pink on February 16, 2017, 08:51:09 PM
A friend sent me this help request last week, can anyone help him out?
Quote
I have a Bozak transformer that I would like to see a full schematic on.  Pretty much has to be a mic input transformer, Altec and Bozak routinely used octal base transformers for this.

The number is CMK-481
Apparently made by Kenyon, the Kenyon # is: S-509023 or possibly S-509028-can't tell.  Found some really old PDF copies of Kenyon catalogs but nothing like this in them.  If there are Bozak schematics around I can't find them.

This I do know:

pins 4-6 low, pins 7-8 high.  pin 8 is also case ground (if there is a faraday shield, might be there too, one thing I would like to know).  pins 4 and 7 are in polarity with each other.

Any ideas?
Thanks,
Gene
Title: Re: Bozak/Kenyon transformer ID
Post by: emrr on February 17, 2017, 09:17:47 AM
Sounds like he's already figured it out.  Not sure what the question is, unless it's that he wants an unobtainium blueprint on a custom part. 
Title: Re: Bozak/Kenyon transformer ID
Post by: JohnRoberts on February 17, 2017, 11:17:20 AM
A friend sent me this help request last week, can anyone help him out?Thanks,
Gene
Good luck, back in the day I'd just call Rudy (RIP).

The cma 10-2D and 10-2DL DJ mixers were very popular and are probably still around.  Some guy on ebay is selling  one with external cma 481 (?) transformers.  http://www.ebay.com/itm/rare-original-bozak-cma-10-2d-rotary-dj-mixer-by-buzzy-beck-approching-urei-1620-/221368320776 (http://www.ebay.com/itm/rare-original-bozak-cma-10-2d-rotary-dj-mixer-by-buzzy-beck-approching-urei-1620-/221368320776)

JR
Title: Re: Bozak/Kenyon transformer ID
Post by: Gene Pink on February 18, 2017, 07:37:53 PM
Sounds like he's already figured it out.  Not sure what the question is, unless it's that he wants an unobtainium blueprint on a custom part.
I'm sure he can figure out the turns ratio, but I would imagine he does not know the design impedance, or if there is a faraday shield that is either grounded, or possibly connected to another pin.

JR, that link may be helpful. His eyes are worse than mine, and he could have misread A for K. I'll pass it on.

Thanks to both of you,
Gene