Nathan's 37-690X

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Nathan's 37-690X

Nathan Slingerland
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Posts: 1,874
Threads: 212
Joined: May 2015
City: Seattle State, Province, Country: WA

08-18-2018, 02:30 PM

My first step (after cleaning off all of the cobwebs) was to go over the major components that I could check with an ohmmeter and verify resistances.

[Image: https://farm2.staticflickr.com/1851/4339...d34b_z.jpg]

The production change described in service bulletin has been applied. Two flexible resistors are used to replace the 80 ohm and 325 ohm sections of the Part No. 177 Candohm.
* 33-3027 - 75 ohms
* 33-3121 - 300 ohms

The 3K section of the replacement two-section Candohm is open. Based on what others have found this is not an uncommon point of failure for this set.
I've ordered new 2.2K and 3K power resistors from Mouser - 50W based on Ron's restoration.

The HV windings of both power transformers measure to spec. The same for the rest of the chokes and transformers on the chassis. That's certainly good news.

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Messages In This Thread

Nathan's 37-690X - by Nathan Slingerland - 08-18-2018, 02:14 PM

RE: Nathan's 37-690 - by Nathan Slingerland - 08-18-2018, 02:30 PM

RE: Nathan's 37-690 - by Nathan Slingerland - 08-18-2018, 02:40 PM

RE: Nathan's 37-690 - by Kenradio - 08-18-2018, 04:02 PM

RE: Nathan's 37-690 - by Nathan Slingerland - 08-18-2018, 08:54 PM

RE: Nathan's 37-690 - by Nathan Slingerland - 08-18-2018, 09:03 PM

RE: Nathan's 37-690 - by morzh - 08-18-2018, 10:00 PM

RE: Nathan's 37-690 - by Nathan Slingerland - 08-19-2018, 01:02 AM

RE: Nathan's 37-690 - by Arran - 08-19-2018, 01:52 AM

RE: Nathan's 37-690X - by klondike98 - 08-21-2018, 11:39 AM

RE: Nathan's 37-690X - by Nathan Slingerland - 08-21-2018, 10:09 PM

RE: Nathan's 37-690X - by Nathan Slingerland - 08-21-2018, 10:52 PM

RE: Nathan's 37-690X - by Nathan Slingerland - 08-22-2018, 08:09 AM

RE: Nathan's 37-690X - by Nathan Slingerland - 08-22-2018, 09:17 PM

RE: Nathan's 37-690X - by Ron Ramirez - 08-22-2018, 09:31 PM

RE: Nathan's 37-690X - by Nathan Slingerland - 08-22-2018, 11:30 PM

RE: Nathan's 37-690X - by Radioroslyn - 08-22-2018, 11:31 PM

RE: Nathan's 37-690X - by Nathan Slingerland - 08-22-2018, 11:33 PM

RE: Nathan's 37-690X - by Nathan Slingerland - 08-23-2018, 12:12 AM

RE: Nathan's 37-690X - by Nathan Slingerland - 08-23-2018, 12:30 AM

RE: Nathan's 37-690X - by morzh - 08-23-2018, 08:08 AM

RE: Nathan's 37-690X - by Nathan Slingerland - 08-25-2018, 11:25 PM

RE: Nathan's 37-690X - by Arran - 08-26-2018, 12:33 AM

RE: Nathan's 37-690X - by Ron Ramirez - 08-26-2018, 07:59 AM

RE: Nathan's 37-690X - by Nathan Slingerland - 09-08-2018, 09:10 AM

RE: Nathan's 37-690X - by klondike98 - 09-08-2018, 11:00 AM

RE: Nathan's 37-690X - by GarySP - 09-08-2018, 11:40 AM

RE: Nathan's 37-690X - by Nathan Slingerland - 09-09-2018, 11:42 AM

RE: Nathan's 37-690X - by Nathan Slingerland - 09-09-2018, 11:56 AM

RE: Nathan's 37-690X - by Nathan Slingerland - 09-09-2018, 04:43 PM

RE: Nathan's 37-690X - by Nathan Slingerland - 09-12-2018, 09:52 PM

RE: Nathan's 37-690X - by morzh - 09-12-2018, 10:35 PM

RE: Nathan's 37-690X - by thirtiesradio - 09-13-2018, 01:32 AM

RE: Nathan's 37-690X - by Nathan Slingerland - 09-13-2018, 10:01 PM

RE: Nathan's 37-690X - by morzh - 09-13-2018, 10:37 PM

RE: Nathan's 37-690X - by Nathan Slingerland - 09-13-2018, 10:53 PM

RE: Nathan's 37-690X - by Radioroslyn - 09-13-2018, 11:16 PM

RE: Nathan's 37-690X - by Nathan Slingerland - 09-13-2018, 11:33 PM

RE: Nathan's 37-690X - by Nathan Slingerland - 09-23-2018, 09:20 PM

RE: Nathan's 37-690X - by Nathan Slingerland - 10-06-2018, 09:28 PM

RE: Nathan's 37-690X - by klondike98 - 10-07-2018, 10:02 AM

RE: Nathan's 37-690X - by morzh - 10-07-2018, 01:37 PM

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