[ICOM] Internal PS question

[Mike Olbrisch]

I stopped using my 740 when I got a 781.  No question which was better
there.

Truth is, the 740 had one of the best receivers of its time.  If I had to
use another 740 in the shack, I wouldn't feel too bad about it.

The speech processor switch is prone to failure. I had replaced mine, and
when I sold it an extra switch went with it.  I am not so sure about the PLL
caps, I never had a problem there.

Over-all, it was a great radio.  I never regretted owning it, I sometimes
regret selling it.  But with a 781 w/ AT-500 and 2KL, 703, 706, 551D, 820S,
full-stack 901A and FT-817 in the shack, I needed the space.

Vy73 - Mike - KD9KC.
El Paso, Texas - DM61rt.
W5-SOTA Association Manager.
W5-SOTA info: www.qsl.net/kd9kc/




-----Original Message-----
From: icom-bounces at mailman.qth.net [mailto:icom-bounces at mailman.qth.net] On
Behalf Of John G.
Sent: Wednesday, March 07, 2012 07:29
To: ICOM Reflector
Subject: Re: [ICOM] Internal PS question

So is the Icom 740 still a pretty good performer overall?  Any typical age 
related problems that show up with it affecting its reliability?


----- Original Message ----- 
From: "Mike Olbrisch" <mike-2007 at elp.rr.com>
To: "'ICOM Reflector'" <icom at mailman.qth.net>
Sent: Wednesday, March 07, 2012 2:09 PM
Subject: Re: [ICOM] Internal PS question


> Good morning Steve and others.
>
> I have three of those internal power supplies.  They are switchers, 
> running
> about 20 KHz IIRC.  The first one is inside the IC-PS30 case.  The second 
> is
> in like-new condition and ready to replace the first when it dies.  The
> third is in need of rebuild, it quit and was replaced by the first.  I 
> have
> the parts, I currently lack the time.
>
> I have found them to run fairly cool under load, and I cannot say I have
> ever heard any noise I could attribute to those supplies.
>
> When I have had them fail, I usually just re-cap them and they seem fine.
>
> I had a fully-loaded IC-740 several years ago.  When I tried to sell it
> as-is I got offers of like $300 on it.  So I stripped it out, sold the 
> bare
> radio for $300, sold the filters and other accessories for another $400 or
> so.  I think I still have the keyer board around here somewhere, no one
> seemed to want it at the time.  So I tossed it in a box of junk up in the
> storage loft above the garage.  I kept the internal supply as a spare for
> the PS-30, same guts.
>
> Anyway - those supplies are pretty good in my book.
>
> Vy73 - Mike - KD9KC.
> El Paso, Texas - DM61rt.
> W5-SOTA Association Manager.
> W5-SOTA info: www.qsl.net/kd9kc/
>
>
>
>
> -----Original Message-----
> From: icom-bounces at mailman.qth.net [mailto:icom-bounces at mailman.qth.net] 
> On
> Behalf Of Steve
> Sent: Tuesday, March 06, 2012 23:04
> To: ICOM Reflector
> Subject: Re: [ICOM] Internal PS question
>
> I was merely inquiring if they really used switching
> type supplies knowing how bad they can be for noise.
>
> ----
> 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/
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----
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