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 Post subject: Volume Control For G.E. F-66 Radio
PostPosted: Dec Fri 03, 2004 9:20 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 66
Location: Salt Lake City, UT. USA
The control on this F-66 is open on one side of the tap that feeds the tone control circuit. Is there a commercially available pot(something close is fine)to replace this pot?<P>2 meg pot with tap at 5K ohm<P>Thanks for any leads....!<P>------------------<BR>


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 Post subject: Volume Control For G.E. F-66 Radio
PostPosted: Dec Fri 03, 2004 10:03 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 6815
Location: Warren, MI, USA 48093-6744 N42.50973 W83.02633
HuggyBear wrote:
<font>quote:</font><HR>Originally posted by Mark A. Gulbrandsen:<BR><B> The control on this F-66 is open on one side of the tap that feeds the tone control circuit. Is there a commercially available pot(something close is fine)to replace this pot?<P>2 meg pot with tap at 5K ohm<P>Thanks for any leads....!<P></B><HR>
<BR>Don't jump on me, I know these ideas are not great.<P>I can't help you with the pot, but I can tell you what I've done in this situation in the past. Depending on circumstances, one idea might work better than the other, both might work or both might be unsuitable. Your call:<P>A pot that is 2 megs, tapped at 5K is essentially a 1.995 meg and a 5K resistor in series. Assuming the break is on the 5k side of the tap, you might be able to bypass the broken section with a 4.7K fixed resistor. Likewise, if it's on the other side (much bigger problem though), a 2 meg resistor (I believe that is a standard 5% value).<P>Replace the pot with a 5 meg unit, and parallel the element with a 4.7 meg and a 10 K resistor in series. The junction between the 2 fixed resistors is now your tap.<P>Other than that, I know of no source for tapped variable resistors, other than surplus suppliers (and good luck finding the correct value). But you never know, you might get lucky...<P>One time I was working on an older TV set. I needed a volume control for it and it was an oddball. But believe it or not I found some available, exact part - surplus, and VERY cheap. You probably won't get that lucky, but I'll keep my eyes open.<P><BR><P>------------------<BR>


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 Post subject: Volume Control For G.E. F-66 Radio
PostPosted: Dec Sat 04, 2004 12:03 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 21859
Location: Maryland, USA
Hi Mark,<P>The Centralab replacement is p/n R-109 plus a p/n K-155 switch.<P>The IRC replacement is p/n D15-139X plus a p/n 41 switch. A note states to use the Type A shaft. Cut to length and adjust the rotational position as required.<P>Both controls are 2 Meg with a tap at 5,000 ohms.<P>Two standard sources:<P>Gary Schneider's Play Things of Past in Cleveland at <A HREF="http://www.OldRadioParts.com" TARGET=_blank>www.OldRadioParts.com</A> <P>Mark Oppat of Antique Audio. Email moppat _at_ comcast _dot_ net. Replace _at_ and _dot_ with appropriate characters.<P>------------------<BR>73 de Leigh W3NLB | | Leigh@AtwaterKent.Info<BR><A HREF="http://www.AtwaterKent.info" TARGET=_blank>http://www.AtwaterKent.info</A> | | <A HREF="http://www.Synchrophase.info" TARGET=_blank>http://www.Synchrophase.info</A>


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 Post subject: Volume Control For G.E. F-66 Radio
PostPosted: Dec Sat 04, 2004 12:06 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 3669
Location: Circleville, OH, USA
The purpose of the tap is to boost bass at low volume settings. You can use an untapped pot and do without this feature. Most sets didn't have it anyway.<P>------------------<BR>


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