Kris,
When you said "Test one fuse at a time", I presume you meant Tube?
73, VE3DWI.
----- Original Message -----
From: <km2km@twc.com>
To: "Discussion of Ten-Tec Equipment" <tentec@contesting.com>
Sent: Tuesday, January 26, 2016 6:27 PM
Subject: Re: [TenTec] Model 411 amp (aka Centaur)
I'm late chiming in. My problem with the fuses has always been a shorted
tube. You are on the right track. Test one fuse at a time, or start
with one, add another, then the third. BTW a matched set is better than
an unmatched set HOWEVER, I had three misc tubes gathered over the years
and put them in and do pretty well with them. I did that while waiting
for a new matched set. Now the matched set is on the shelf waiting their
turn!!!
The guy at the local electronics store said to me one day when I bought a
dozen fuses, "You do know that if you don't fix it then it will still blow
fuses!"
good luck,
Kris
Kris KM2KM
MERSCHROD
123 Warren Road
Ithaca, NY 14850
---- Joe Papworth via TenTec <tentec@contesting.com> wrote:
=============
It has stayed on with the tubes removed for a while.?
I'm examining/ohming the tubes now.
-----Original Message-----
From: Carl Moreschi <n4py3@earthlink.net>
To: wb5jnc <wb5jnc@centurytel.net>; Discussion of Ten-Tec Equipment
<tentec@contesting.com>
Sent: Tue, Jan 26, 2016 3:03 pm
Subject: Re: [TenTec] Model 411 amp (aka Centaur)
Don't overlook the possibility on an intermittent short in one of the
811's.
Carl Moreschi N4PY
58 Hogwood Rd
Louisburg, NC 27549
www.n4py.com
On 1/26/2016 2:54 PM, Al Gulseth wrote:
Joe,
Just an ohms check may not be enough. You may be dealing with an
intermittent
breakdown under high voltage. A "hi-pot" (high potential) test with an
insulation tester etc. would be the only way to know for sure. A winding
layer to adjacent layer partial short in the HV side could also account
for
your symptoms, and might not be obvious because the winding resistance
could
show right at the low edge of the manufacturer's spec. (I went through
that
scenario years ago with a HV filter choke in a small AM BC transmitter.)
73 es GL, Al
On Tue January 26 2016 11:28:03 am Joe Papworth via TenTec wrote:
Thanks Andy. Was it the HV secondary that shorted?
I isolated the HV secondary from the HV board and it reads open to
the
frame and chassis. (Reads about 45 ohms when connected to the board)
Thanks, Joe, K8MP
-----Original Message-----
From: P C Andy Anderson<xtraham58@hotmail.com>
To: Discussion of Ten-Tec Equipment<tentec@contesting.com>
Sent: Tue, Jan 26, 2016 11:52 am
Subject: Re: [TenTec] Model 411 amp (aka Centaur)
Joe, I had a similar problem with my Centurion AMP. It eventually
failed
completely. The secondary of the power transformer shorted to the
frame. I
had the Xformer rewound at TRS. BTW this transformer problem is a
known.
73' Andy, W3LI
________________________________________
Tuesday noontime, Joe:
I have a Centaur..............keep it covered when not in use.
My Elmer told me to always keep it covered..................dust is
the
problem.
Even when covered, open it up every two-three years and do a internal
cleaning.
N1MHC/alsirois
=============
Gents,
Have any of you gone a few rounds with a Centaur amp?
I have a one that blows fuses very intermittently. It vaporizes them
both,
simultaneously, so it's apparently a dead-short somewhere. This
happens
even in stand-by. (i.e. No key-down)
Before I tear into it, anyone have any ideas of common failures in
these
amps?
Later, Joe, K8MP
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