[ICOM] Internal PS question

[jkolin at optonline.net]

Electrolytics are the only components containing liquids and are usually the weak links in electronic circuits. If you've ever rebuilt an old piece or gear you know the first things to replace are all the electrolytics.My experience has shown the more heat that electrolytics are subjected to, the quicker they lose their value and the shorter their life. The heat tends to escalate the drying of the liquid or gel used in electrolytic capacitors. Loss of capacitance can negatively affect performance of circuits and can result in a radio not up to original specs.This is the main reason I always purchase transceivers without internal pwr supplies and why I add a small low speed muffin fan to keep radios cooler than the internal fans supplied with radios.Jay,  NE2Q----- Original Message -----From: Steve Date: Tuesday, March 6, 2012 10:59 pmSubject: Re: [ICOM] Internal PS questionTo: ICOM Reflector > Are the built in supplies really of the switching type > especially in > the older 735?> I've always assumed they were just good old linear type supplies > with > no noise problems. I guess I never really looked to see if there > is > room inside for the large transformer of a linear type supply.> > > At 08:57 PM 3/6/2012, you wrote:> >I have an Icom IC-736...Has built in AC supply, built in tuner, 6> >meters, LARGE display, and analog S meter....For these items, > it is one> >of my favorite rigs.> >It works great!!!> >....Dave> >> >On 3/6/2012 8:11 PM, John G. wrote:> > > On the older Icoms like the 740 and 751A that have an > internal PS > > option, is it usually better to get one with or without the > PS?  It > > would be convenient to just plug the rig into the wall, but > how > > quiet are these older switching PS?  Also, does the heat they > > generate affect the reliability of the radios at all?> > >> > > 73 John> > > AF5CC> > > ----> > > Your Moderator: Dick Flanagan K7VC: icom-owner at mailman.qth.net> > > Icom Users Net: Sundays, 1700Z, 14.316 MHz> > > Icom FAQ: http://www.qsl.net/icom/> > > To support QSL/QTH.net: http://www.qsl.net/donate.html> > >> >----> >Your Moderator: Dick Flanagan K7VC: icom-owner at mailman.qth.net> >Icom Users Net: Sundays, 1700Z, 14.316 MHz> >Icom FAQ: http://www.qsl.net/icom/> >To support QSL/QTH.net: http://www.qsl.net/donate.html> > ----> Your Moderator: Dick Flanagan K7VC: icom-owner at mailman.qth.net> Icom Users Net: Sundays, 1700Z, 14.316 MHz> Icom FAQ: http://www.qsl.net/icom/> To support QSL/QTH.net: http://www.qsl.net/donate.html>