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 Post subject: Potentiometer type question.
PostPosted: Sep Mon 13, 2021 4:21 pm 
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Joined: Mar Wed 27, 2019 1:56 am
Posts: 323
Location: Mountainside, NJ
I have a Heathkit SB-220 linear and want to install a standby/ operate switch on it and I want to replace the Sensitivity 100 kohm Potentiometer with a 100 kohm w/ On-Off rather than drilling a hole.
Is the original potentiometer a audio, Logarithmic……? What type can I use?


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 Post subject: Re: Potentiometer type question.
PostPosted: Sep Mon 13, 2021 4:31 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 11629
Location: Omak,WA,usa
Hello Ugctheater,
audio taper is the type of control that you want to use .
Here is a new old stock from ebay https://www.ebay.com/itm/254352065032?chn=ps&norover=1&mkevt=1&mkrid=711-213727-13078-0&mkcid=2&itemid=254352065032&targetid=4581183927179147&device=c&mktype=&googleloc=&poi=&campaignid=418233787&mkgroupid=1241348861725295&rlsatarget=pla-4581183927179147&abcId=9300542&merchantid=51291&msclkid=c473071a66bd12954c3d6625082d2d40


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 Post subject: Re: Potentiometer type question.
PostPosted: Sep Mon 13, 2021 4:33 pm 
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Joined: Feb Wed 07, 2018 6:52 pm
Posts: 1100
Location: Stone Mountain, GA
Easiest is just to measure it. Set the pot to the center and measure the resistance from the center to one end. If it is 50K (half) then it is linear.

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 Post subject: Re: Potentiometer type question.
PostPosted: Sep Mon 13, 2021 8:21 pm 
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Joined: Jun Fri 19, 2009 6:34 pm
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Location: Long Island NY
The control is in series with the meter on the front panel when the meter selector switch is in the "Rel Power" position. It would almost certainly be a straight linear taper control since it is acting as a multiplier for the meter.

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