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 Post subject: Atwater Kent 337
PostPosted: Feb Thu 22, 2018 4:57 am 
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Joined: Apr Fri 14, 2017 3:03 am
Posts: 52
Location: Dallas, Texas
Replaced capacitors, electrolytics, and several bad resistors. The question I have is does anyone know the pin voltages? The AK schematic does not show those values. Also, how do I check the coils? Continuity or Ohms? what should those values be. I hear noise from the speaker, but that's it. Any information would be much appreciated.


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 Post subject: Re: Atwater Kent 337
PostPosted: Feb Thu 22, 2018 5:07 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 33189
Location: Maryland 20709, USA
The Rider schematic gives all the voltages.
http://atwaterkent.info/TechData/Images/Rider6_017.gif

Unfortunately they're white letters on a black background, and sometimes difficult to read.
You can look for that Rider page on other sites.

This is one of those AK schematics that uses an inverted omega to mean Megohms.
So "0.1 inverted-omega" means 0.1 Megohms = 100,000 ohms.

- Leigh

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73 de W3NLB
http://www.AtwaterKent.info
Click "Grebe Stuff" for Synchrophase info


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 Post subject: Re: Atwater Kent 337
PostPosted: Feb Thu 22, 2018 5:25 am 
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Joined: Apr Fri 14, 2017 3:03 am
Posts: 52
Location: Dallas, Texas
Leigh,

Thanks I see them now. What about coils?


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 Post subject: Re: Atwater Kent 337
PostPosted: Feb Thu 22, 2018 5:31 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 33189
Location: Maryland 20709, USA
Coils generally fail open rather than shorted.
If you measure continuity, they're likely OK.

The antenna coil primary is often open due to proximate lightning strikes.

- Leigh

_________________
73 de W3NLB
http://www.AtwaterKent.info
Click "Grebe Stuff" for Synchrophase info


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 Post subject: Re: Atwater Kent 337
PostPosted: Feb Fri 23, 2018 2:12 pm 
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Joined: Apr Fri 14, 2017 3:03 am
Posts: 52
Location: Dallas, Texas
Checked the coils all have continuity. Noticed a wire that needs to be replaced and will check for bad solder joints. Will report back. Thank you.


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 Post subject: Re: Atwater Kent 337
PostPosted: Mar Sun 04, 2018 6:45 pm 
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Joined: Apr Fri 14, 2017 3:03 am
Posts: 52
Location: Dallas, Texas
Replaced multiple wires connecting to coils brittle cracked and touching the chassis. Also, the heater wires were very brittle replaced as well. Heater voltages and plate and grid voltages on the 5Z4 are within specification. I hear a little noise coming from the speaker but no reception. What should be the next course of action to check? Thanks.


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