Damien,
This should tell you everything you need to know about the AC-4.
http://www.wb4hfn.com/DRAKE/DrakeArticles/AC4_Troubleshooting/
Drake_AC3-AC4_Troubleshooting.htm
73
Rick
W9WS
On Aug 25, 2012, at 11:00 AM, drakelist-requ...@zerobeat.net wrote:
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Today's Topics:
1. Re: Exploding cap's ??? (Arthur Delibert)
2. Exploding Cap' ??? (Damien Mannix)
----------------------------------------------------------------------
Message: 1
Date: Fri, 24 Aug 2012 19:36:11 -0400
From: Arthur Delibert <radio7...@msn.com>
To: <damienman...@hotmail.com>, <drakelist@zerobeat.net>
Subject: Re: [Drakelist] Exploding cap's ???
Message-ID: <snt124-w378f2d3e94b8a9ac456f32e4...@phx.gbl>
Content-Type: text/plain; charset="iso-8859-1"
Be sure the electrolytics are fully discharged before you touch
anything inside. They can retain a high enough charge to give you
a serious jolt. In a lot of power supplies, the electrolytics have
a "bleeder" resistor across them, to drain down that charge within
a minute or so after the unit is turned off. But you're working in
old equipment where things may have been modified and/or broken.
A few years ago I bought an old transmitter with separate power
supply at a hamfest. The seller assured me it was all in working
condition. I think I would have been killed if I'd relied on that
bit of "puffery." But W1ES is right -- they're pretty
straightforward, and you shouldn't have any trouble figuring out
what's what or working on it. Just be sure to respect the voltages
that it's capable of.
--Art Delibert, KB3FJO
From: damienman...@hotmail.com
To: drakelist@zerobeat.net
Date: Fri, 24 Aug 2012 16:03:54 +0000
Subject: Re: [Drakelist] Exploding cap's ???
Wow, thank you so much to all for the most useful information. Yes
the AC4 is wired for 240 v.
Hoped to string up some sort of temporary antenna this weekend and
get on the air but I now know I will be busy doing something else!
Just hope I have the technical abilty to sort it out. Years ago I
built a Heathkit scope but that is about my only experience with
components, soldering etc.
I do not suppose any Drake enthusiast will have any doubt as to why
a TR4 but in case anybody has, in the late 60's and early 70's when
I was active I had three receivers in a row, the last being a R4A.
I thought it was magnificent and way ahead of any receiver I had
tried at the time. Wish I still had it today. It is only natural
that I want to return to Drake.
Thanks again everyone.
Damien
G3XER
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Message: 2
Date: Sat, 25 Aug 2012 15:36:08 +0000
From: Damien Mannix <damienman...@hotmail.com>
To: <drakelist@zerobeat.net>
Subject: [Drakelist] Exploding Cap' ???
Message-ID: <bay153-w50feff8d75ffe3bfc7769bd8...@phx.gbl>
Content-Type: text/plain; charset="iso-8859-1"
Hello all, I am embarrassed but most grateful for all the kindness
and helpful advice given to me. Too many to thank individually but
many many thanks to all. The safety advice is taken very seriously
and I will be ultra cautious bearing in mind my inexperience.
Already I am puzzled. Astonished in fact. A most careful
examination of every component in the AC4 and then the TR4,
magnifying glass and high power flashlight and what a lot under the
TR4, shows no sign of distress to any component!! Clearly the bang
came from somewhere, I was not dreaming, so I guess it is time to
carefully take some voltage measurements from the AC4 as a first
step. DamienG3XER
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