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 Post subject: zenith cobra-matic 1954-56 stroboscope
PostPosted: Nov Tue 22, 2005 8:01 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 8
Location: tulsa
Problem is keeps cycling and tonearm never sets in correct postion.also does anyone have a sams or something that shows adjustments. how does it shut off( I have turntable out on bench and ac going straight to the turtable input (a.c.)connector.the only way I can get it to shut off is to turn speed lever to off. looking for idler wheels and cartridge for it


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 Post subject: zenith cobra-matic 1954-56 stroboscope
PostPosted: Nov Wed 23, 2005 2:46 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 1129
Location: Phoenix, Arizona
Didn't the Cobramatic use a capacitive type pickup?<P>I mention this because there are people who rebuild the old Piezo type pickyps but finding that little number with its integral needle could be a little tricky.<P>------------------<BR>


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 Post subject: zenith cobra-matic 1954-56 stroboscope
PostPosted: Nov Thu 24, 2005 12:33 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 1688
Here's Cobra service information:<BR> <A HREF="http://www.nostalgiaair.org/PagesByModel/656/M0025656.pdf" TARGET=_blank>http://www.nostalgiaair.org/PagesByModel/656/M0025656.pdf</A> <P>The pickup is different from others, it generates no voltage, but controls an oscillator to convey the information.<P>------------------<BR>Richard <BR><A HREF="http://www.dressner.com/radio.htm" TARGET=_blank>www.dressner.com/radio.htm</A>


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 Post subject: zenith cobra-matic 1954-56 stroboscope
PostPosted: Nov Thu 24, 2005 7:49 pm 
Member

Joined: Jan Thu 01, 1970 1:00 am
Posts: 97
Location: Jersey City/NYC
Zenith Cobras made until 1954 used the Radionic cartridge, but those made from '54 till 1958 used ceramic cartridges. The Radionic cartridge was not capable of hi fi reproduction, hence the changeover to ceramic. If your tone arm had a small "switch" to change from LP to 78 sylus, this is a hi fi ceramic cartridge.<P>The changer itself underwent many improvements and updates before the original design was abandoned and Zenith began tagging VM changers (this happened when stereo was introduced) with the Cobra label. The most notable was the motor assembly, and early changers used different rubber parts than the later ones. So, be careful and make sure you are purchasing the correct replacements for your unit.<P>------------------<BR>


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 Post subject: zenith cobra-matic 1954-56 stroboscope
PostPosted: Nov Thu 24, 2005 7:58 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 8
Location: tulsa
Thanks for info, I beleive mine has ceramic cartridge does any one know where I can get idler wheels,spindle and cart/needle for this, the one I have says stroboscope and entire unit is a light brown color with chrome overarm and gold color plater the amp/am tuner has mgf date of 1955 on it.


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 Post subject: zenith cobra-matic 1954-56 stroboscope
PostPosted: Nov Sun 27, 2005 4:26 am 
New Member

Joined: Jan Thu 01, 1970 1:00 am
Posts: 16
Location: Kalamazoo, Michigan, USA
Hi! I just LOVE those snake-eyed tone arms! Here is a GREAT guy to talk to...he rebuilds Cobra-matics , RCA Victor 45 cycling cams, idlers & cartridges and Wilcox-Gay Recordio cutting heads...I use him for ALL my idler, Cartidge & needle needs....he's the BEST! Check his site out: <A HREF="http://www.west-techservices.com/" TARGET=_blank>http://www.west-techservices.com/</A> <P>The ONLY thing I do not agree with him on is ripping out the oscillator circuit-based cartridge and putting a ceramic in....I have a secret nos of these...just let me know which one you need and I'd be glad to sell you one. Regards, The Vintage TV Doctor<P>------------------<BR>


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 Post subject: zenith cobra-matic 1954-56 stroboscope
PostPosted: Nov Mon 28, 2005 5:08 am 
New Member

Joined: Jan Thu 01, 1970 1:00 am
Posts: 8
Location: tulsa
Perfect, thanks again for the references, I will contact them to see if they can hel[p me in this project.


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 Post subject: zenith cobra-matic 1954-56 stroboscope
PostPosted: Nov Tue 29, 2005 11:20 pm 
Member

Joined: Jan Thu 01, 1970 1:00 am
Posts: 3829
Location: Berkley, Michigan
These changers had to be shut off manually. The mechanism is really quite simple compared to some. They have a solenoid activated trip. Chances are that the trip link on the drive gear is frozen in the trip position. Ed Saunders has replacement plug in ceramic cartridges with mono tips only. It's really a unique record changer. <P>I bought a second Cobra changer for the 45 spindle and to cannibalize for parts to get this one going. It gets a lot of comments.<P> <IMG SRC="http://www.geocities.com/drv_48072/DSCN0141.JPG"> <P><P>------------------<BR>


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