Send Drakelist mailing list submissions to
drakelist@zerobeat.net
To subscribe or unsubscribe via the World Wide Web, visit
http://mailman.zerobeat.net/mailman/listinfo/drakelist
or, via email, send a message with subject or body 'help' to
drakelist-requ...@zerobeat.net
You can reach the person managing the list at
drakelist-ow...@zerobeat.net
When replying, please edit your Subject line so it is more specific
than "Re: Contents of Drakelist digest..."
Today's Topics:
1. Exploding cap' ??? (Damien Mannix)
2. Re: Exploding cap' ??? (Ed Tanton)
3. Re: Exploding cap' ??? (Charles Ring)
4. Re: Exploding cap' ??? (Ed Tanton)
5. FOR SALE: Drake T4XC Transmitter and AC4 Power Supply
(William Mills)
----------------------------------------------------------------------
Message: 1
Date: Thu, 23 Aug 2012 16:24:05 +0000
From: Damien Mannix <damienman...@hotmail.com>
To: <drakelist@zerobeat.net>
Subject: [Drakelist] Exploding cap' ???
Message-ID: <bay153-w2804d03b199e4cb566527fd8...@phx.gbl>
Content-Type: text/plain; charset="iso-8859-1"
Hi all, Bought an immaculate looking TR4 which has been out of use
a long time. Also bought an AC4 which claims to have had the
original EHT caps and diodes replaced. Powered them up with 20 vac
for four hours, then up in 20 v steps at four hours per step,
listening and sniffing for any problems. Reached 220 vac an hour
ago. AC4 slightly warm and centre of TR4 top a bit warmer. Then
there was one hell of a crack! Sounded like a gunshot and
frightened me to death! Swiched off immediately of course. No
smell that I can detect. Is that what an exploding capacitor sounds
like? Any advice on where to start looking? The TR4 or the AC4?
Sad day for me. Trying to return to the hobby after over 30
years. Been too busy making a living and bringing up a family.
Regards, DamienG3XER
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.zerobeat.net/pipermail/drakelist/attachments/
20120823/4db821dc/attachment-0001.html>
------------------------------
Message: 2
Date: Thu, 23 Aug 2012 13:26:52 -0400
From: "Ed Tanton" <n...@comcast.net>
To: "'Damien Mannix'" <damienman...@hotmail.com>,
<drakelist@zerobeat.net>
Subject: Re: [Drakelist] Exploding cap' ???
Message-ID: <002b01cd8154$7c7d6100$75782300$@comcast.net>
Content-Type: text/plain; charset="us-ascii"
Is it possible power supply was set for 110V not 220V? I do not
believe it's
the TR4-although of course it could be. If it was, I should think
you would
have lost a diode(s) or Heaven-forbid: the transformer. It could
have been a
faulty diode that caused it-hence, after making sure about the
input voltage
selector (and if it's correct, I'd check its wiring) I'd check all the
diodes.
Finally, it's always possible it was just the capacitor's time
having come.
If you've made sure about the voltage setting, then replace the
cap, do the
same start-up routine, and then the SAME cap goes, then yeah, it's
obviously
not the caps, but something else going on.
Before you walk-away for the run-time test, I'd check all the
voltages just
to be sure they're right. That way, if it does go again (or some
other cap)
you'll know at least it LOOKED right prior to catastrophe.
Ed Tanton
website: <http://www.n4xy.com/> http://www.n4xy.com
All emails <IN> & <OUT> checked by
Norton AntiVirus with AutoProtect
--------------------------------------------------
Wag more / Bark less
--------------------------------------------------
From: drakelist-boun...@zerobeat.net [mailto:drakelist-
boun...@zerobeat.net]
On Behalf Of Damien Mannix
Sent: Thursday, August 23, 2012 12:24 PM
To: drakelist@zerobeat.net
Subject: [Drakelist] Exploding cap' ???
Hi all,
Bought an immaculate looking TR4 which has been out of use a long
time.
Also bought an AC4 which claims to have had the original EHT caps
and diodes
replaced.
Powered them up with 20 vac for four hours, then up in 20 v steps
at four
hours per step, listening and sniffing for any problems. Reached
220 vac an
hour ago. AC4 slightly warm and centre of TR4 top a bit warmer.
Then there
was one hell of a crack! Sounded like a gunshot and frightened me
to death!
Swiched off immediately of course. No smell that I can detect.
Is that what an exploding capacitor sounds like? Any advice on
where to
start looking? The TR4 or the AC4?
Sad day for me. Trying to return to the hobby after over 30
years. Been
too busy making a living and bringing up a family.
Regards,
Damien
G3XER
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.zerobeat.net/pipermail/drakelist/attachments/
20120823/b8d3cdd6/attachment-0001.html>
------------------------------
Message: 3
Date: Thu, 23 Aug 2012 15:55:03 -0400
From: Charles Ring <w...@roadrunner.com>
To: Damien Mannix <damienman...@hotmail.com>
Cc: drakelist@zerobeat.net
Subject: Re: [Drakelist] Exploding cap' ???
Message-ID: <50368a97.9090...@roadrunner.com>
Content-Type: text/plain; charset="iso-8859-1"; Format="flowed"
On 8/23/2012 1224, Damien Mannix wrote:
Hi all,
Bought an immaculate looking TR4 which has been out of use a long
time. Also bought an AC4 which claims to have had the original EHT
caps and diodes replaced.
Powered them up with 20 vac for four hours, then up in 20 v steps at
four hours per step, listening and sniffing for any problems.
Reached
220 vac an hour ago. AC4 slightly warm and centre of TR4 top a bit
warmer. Then there was one hell of a crack! Sounded like a gunshot
and frightened me to death! Swiched off immediately of course. No
smell that I can detect.
Is that what an exploding capacitor sounds like? Any advice on where
to start looking? The TR4 or the AC4?
Sad day for me. Trying to return to the hobby after over 30 years.
Been too busy making a living and bringing up a family.
Regards,
Damien
G3XER
I had this happen to an R-4B probably 25 years ago. A medium sized
lytic
went off like a bomb. Many tiny fragments to extract from under the
chassis but upon replacing the cap, all was fine. Very startling.
--
*Charles Ring W3NU*
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.zerobeat.net/pipermail/drakelist/attachments/
20120823/67d6d0de/attachment-0001.html>
------------------------------
Message: 4
Date: Thu, 23 Aug 2012 16:06:42 -0400
From: "Ed Tanton" <n...@comcast.net>
To: "'Charles Ring'" <w...@roadrunner.com>, "'Damien Mannix'"
<damienman...@hotmail.com>
Cc: drakelist@zerobeat.net
Subject: Re: [Drakelist] Exploding cap' ???
Message-ID: <005801cd816a$d07afd10$7170f730$@comcast.net>
Content-Type: text/plain; charset="us-ascii"
I forgot to mention I was present when one within my Drake L7 went.
Filled
the basement with little tiny things that looked a lot like tiny black
butterflies fluttering to the floor. I don't remember if diodes
went or not.
But it did repair easily enough.
Ed Tanton
website: <http://www.n4xy.com/> http://www.n4xy.com
All emails <IN> & <OUT> checked by
Norton AntiVirus with AutoProtect
--------------------------------------------------
Wag more / Bark less
--------------------------------------------------
///snip
I had this happen to an R-4B probably 25 years ago. A medium sized
lytic
went off like a bomb. Many tiny fragments to extract from under the
chassis
but upon replacing the cap, all was fine. Very startling.
--
Charles Ring W3NU
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.zerobeat.net/pipermail/drakelist/attachments/
20120823/e3ada980/attachment-0001.html>
------------------------------
Message: 5
Date: Thu, 23 Aug 2012 16:57:57 -0400
From: "William Mills" <mills...@windstream.net>
To: <drakelist@zerobeat.net>
Subject: [Drakelist] FOR SALE: Drake T4XC Transmitter and AC4 Power
Supply
Message-ID: <F2F0E2EEB3FA42A38617AED2B8FD8E15@D3DT6RD1>
Content-Type: text/plain; charset="iso-8859-1"
Excellent condition Drake T4XC transmitter and AC4 power supply
for sale. Also, AC4 power supply capacitor upgrade kit to be
installed. If interested, send me an e-mail or call (478-452-2957)
and make a reasonable offer on the package or single items.
73,
Bill Mills
KC4AA
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.zerobeat.net/pipermail/drakelist/attachments/
20120823/2bde3683/attachment-0001.html>
------------------------------
_______________________________________________
Drakelist mailing list
Drakelist@zerobeat.net
http://mailman.zerobeat.net/mailman/listinfo/drakelist
End of Drakelist Digest, Vol 50, Issue 19
*****************************************
