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 Post subject: volume control question
PostPosted: Oct Wed 28, 2020 7:04 pm 
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Joined: Oct Tue 27, 2020 9:57 pm
Posts: 3
This is my first post on this forum. Glad to find so many people with my same interests. I am restoring an Emerson EC-336 table radio (AA5). My question concerns the volume control. The original is very "scratchy" and the switch has high DC resistance. I bought a replacement from Antique Electronic Supply. It is the same resistance (500K), audio taper with a switch. I will have to file a flat on the shaft and cut it to match the original which is doable. My question concerns the wattage. The original potentiometer section is 28 mm in diameter. The replacement is 24mm in diameter and is rated at .5 watts. The manufacturer of the replacement is "Alpha". Is this a suitable replacement? I am concerned the difference in diameter indicates a difference in the wattage.


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 Post subject: Re: volume control question
PostPosted: Oct Wed 28, 2020 9:02 pm 
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Joined: Jun Sat 15, 2019 7:43 pm
Posts: 1006
The 1/2 watt replacement will be fine.

DM


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 Post subject: Re: volume control question
PostPosted: Oct Wed 28, 2020 10:09 pm 
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Joined: Nov Tue 14, 2017 5:09 am
Posts: 3154
Location: Austin, Texas
Normally there is no concern about the wattage rating of volume controls. The highest voltage across a volume control is usually the radio AVC voltage which is less than 10 volts. The actual power dissipation in a 500K volume control would be about 0.0002 watts.

Jay


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 Post subject: Re: volume control question
PostPosted: Oct Wed 28, 2020 10:25 pm 
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Joined: Jan Mon 18, 2010 2:13 am
Posts: 21444
Location: Dayton Ohio
Hello and welcome to the Antique Radio forums :D

Just curious, did you try a squirt of contact cleaner in your old control?
It is a common problem.

-Steve

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Radio Interests
-Zenith
-Sparton
-Pre-War FM
Consoles and floor models, the bigger, the better!


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 Post subject: Re: volume control question
PostPosted: Oct Wed 28, 2020 11:30 pm 
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Joined: Oct Tue 27, 2020 9:57 pm
Posts: 3
I considered that. The new control cost $2.65. A can of contact cleaner would cost at least that much. The switch would still be an issue. It did seem to allow power to go on but the DC resistance was 300 ohms. Not sure I could get the contact cleaner in the switch.


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 Post subject: Re: volume control question
PostPosted: Oct Thu 29, 2020 3:07 am 
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Joined: Sep Mon 16, 2013 2:42 am
Posts: 4309
Location: Tucson, Arizona U.S.A.
Your old control probably had a 1/4" diameter shaft. Many new pots have 6mm. The difference is small but it can make knobs fit "not quite right".

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Jim Mueller


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 Post subject: Re: volume control question
PostPosted: Oct Thu 29, 2020 9:38 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 3625
Location: Nr London, England, SS1 3PT
These are 1/4" shaft pots and very smooth having a really nice viscous feel that is consistent over the four I bought.

Amazingly low cost for a quality item. Two singles and two doubles (no switches) and I still got under the £15 Customs hit and hassle limit. Bought from AES, wonderful service

Gary


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 Post subject: Re: volume control question
PostPosted: Oct Thu 29, 2020 2:33 pm 
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Joined: Oct Tue 27, 2020 9:57 pm
Posts: 3
I would like to thank everyone for their outstanding responses! This is a great forum! I hope I am able to help someone. :D


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