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Atwater Kent model 38

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Post by lhlyda on Sat Jan 28, 2017 9:01 pm

Hey guys, new to TRF so I'll try to catch up a bit. Bought an AK 38 off ebay a couple of years ago and just now getting around to it. I'm restoring the cabinet in parallel with refurbishing the electronics ( optimism at its best, lol).

I started by cleaning the power supply mounting base and cabinet. I used naval jelly on the really rusty spots. Matching the PS green paint wasnt that hard, it may not be an exact match, but anyone who saw one new, is probably dead. I used Krylon camoflauge paint ( olive) for the power supply and the dark brown for the cabinet. The center panel of the top I used bright gold, Ace hardware
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Post by Bill Cahill on Mon Jan 30, 2017 3:10 pm

If you are planning on restoring this radio, let me give you some warnings...
1 They used all rubber insulated wiring, they tend to crumble, and short out.
2 The power supply holds all paper electrolytics, the audio output transformer, and, a filter choke.
This type of set is difficult to rebuild.

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Post by lhlyda on Mon Jan 30, 2017 4:12 pm

Thx Bill, I have experienced all the above. I removed the chokes and capacitors from the tar. One of the chokes was bad. I replaced it with  a 750 ohm resistor and upped the capacitance of the filter caps. Im in the process of putting the power supply and everything back to gether and looking forward to bringing it back up slowly.

I have pictures of the chokes and caps,once the tar is removed. The caps, are actually long rectangular metal, resembling packs of chewing gum on steroids. If I can figure out how to post pics, I'll share them.
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Post by Bill Cahill on Mon Jan 30, 2017 5:00 pm

Thanks. I once had a model 40, and, It was blowing fuses, and, rectifiers. Checking proved that the filter caps were dead shorted.

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Post by Tony V on Mon Jan 30, 2017 5:23 pm

I have both a AK 38 and a 40. I never dug into them yet because of the tar so they're shelf queens for now.
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Post by lhlyda on Mon Jan 30, 2017 5:33 pm

Tony, wasnt that big a deal, a big mess. However,  Ive read of people replacing the caps, without removing the tar. They melted enough to find the 3 wires to the caps and cut them and replace the caps I could not locate them, so I melted and removed the internals. I lost one of the chokes in the process, my clumsiness, but Ive replaced it with a resistor. I know of someone who replaced all the chokes, including the speaker choke with resistors. Works fine.

I'd like to restore a 37 and a 40 someday
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Post by lhlyda on Mon Jan 30, 2017 5:59 pm

Here is a before pic of the top and the restored top and cabinet

Atwater Kent model 38 Image13
Atwater Kent model 38 Image14


Here is a before and after the power supply mounting plate

Atwater Kent model 38 Image11
Atwater Kent model 38 Image12
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Post by John Bartley on Mon Jan 30, 2017 6:05 pm

Nice work !!

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Post by lhlyda on Mon Jan 30, 2017 6:18 pm

Transformer before and after


Atwater Kent model 38 Image19
Atwater Kent model 38 Image20


The filter caps and chokes removed from the tar.


Atwater Kent model 38 Image23
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Post by lhlyda on Mon Jan 30, 2017 9:51 pm

The tuning knob, before and after I cleaned and wiped the numbers and notches with oil based art paint.


Atwater Kent model 38 Image24
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