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Nathan's 37-690X
Nathan Slingerland
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Posts: 1,874
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Joined: May 2015
City: Seattle State, Province, Country: WA
#34

09-13-2018, 10:01 PM
Thanks Keith! I agree - it's much less nerve wracking to work on a mostly working radio.

Interesting about the limited bass adjustment Mike. I did remove the audio choke and sure enough it is open.

It has wire leads so I took it apart to see if it was just broken where the wires connect. It wasn't - the break must be internal.

The good news is that I found the specs on Part No. 32-7528 in the 1942 Philco Parts Catalog.  Icon_thumbup

   
  • 65H
  • 2,250 ohm (approx the 2,000 labeled on the schematic)
  • 10mA rating
  • 2"H x 1 3/4"W x 1 5/8"D

It has 2 1/4" mounting holes.

What do you guys think of Hammond 155C as a replacement? The specs are:
  • 60H
  • 2,750 ohm
  • 8 mA rating

The current rating is lower (8mA vs 10mA) but the resistance is higher than the original Philco part (2750 ohm vs. 2250 ohm).
So does that mean the max design voltage should be 225V and so 225V / 2750 ohm = 8.18 mA = close enough?
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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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  1. The PHILCO Phorum
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