[Boatanchors] BC-348...

[Adam Liette]

My wuestion about the hum issue was the way it starts after the set has
warmed up a while, but goes away when powered down for 10 - 15 min. I do
have some experience with vintage sets (need to finish my recap job on the
Zenith 5-J-217 someday), but I'm hoping to preserve the previous fellow's
work.

73,
Adam, N8YD


-----Original Message-----
From: Lloyd KK7IZ [mailto:kk7iz at cox.net]
Sent: Tuesday, July 21, 2009 1:21 AM
To: The Pollacks; 'Adam Liette'; Boatanchors at mailman.qth.net
Subject: Re: [Boatanchors] BC-348...


B- is above the chassis ground on these. Check to be sure it is properly
wired. Don't remember all the details, maybe someone else will.
Thanx
Lloyd  KK7IZ
kk7iz at cox.net
480-620-7145


----- Original Message -----
From: "The Pollacks" <rinkies at att.net>
To: "'Adam Liette'" <n8yd at woh.rr.com>; <Boatanchors at mailman.qth.net>
Sent: Monday, July 20, 2009 10:14 PM
Subject: Re: [Boatanchors] BC-348...


> Nice to see a young guy getting involved in boat anchors!  Maybe they'll
> be
> a market for my collection when I shuffle off this worldly inductor!
>
> Hum sometimes comes from bad filter caps in that power supply.  I usually
> just parallel a good one temporarily.  If that doesn't do it, look for bad
> grounds through the receiver.  If the ground lugs are fastened with nuts
> and
> bolts, sometimes just loosening and tightening will do it.  If there's
> corrosion, use some emery paper and make sure the connections are shiny.
>
> These two things will clear up most of the hum problems.  If not, check
> for
> leaky caps, especially in the audio section.  Not a bad idea just to
> change
> all the caps.  They're cheap these days!
>
> Good luck
> Ron K2RP
>
>
> -----Original Message-----
> From: boatanchors-bounces at mailman.qth.net
> [mailto:boatanchors-bounces at mailman.qth.net] On Behalf Of Adam Liette
> Sent: Monday, July 20, 2009 9:53 PM
> To: Boatanchors at mailman.qth.net
> Subject: [Boatanchors] BC-348...
>
>
> Hello, gang. I've fired up my BC-348 (with a genuine hombrewed by an old
> timer AC supply), and am reminded of the terrible hum. Is there something
> in
> the 348 I might start with, or blame the outboard PS? My old timer comment
> is made as I'm 26, and the previous owner is an SK. There's also what
> seems
> to be an S-Meter added, and a couple of small toggles. Is there info on a
> common mod such as this?
>
> Thanks and 73!
> Adam, N8YD
>
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