Good morning Joe,
Yes, my AMP does make a "thunk" when turned on, but, for example, I have been
using it for an hour. Then I turned it off. Now, 15 minutes later, I turn it
on and it does not "Thunk".
I found that this AMP was built well, and the only issues for over 20 years
have been the tubes, and of of the toggle switches (IP/EP). The change to 10
meters was a snap.
Yes, it could have a quieter fan, but it is a good AMP and makes an S-unit
difference.
Good luck with the tubes. BTW I have used it with only two tubes, while
waiting for a new set.
Kris
Kris KM2KM
MERSCHROD
123 Warren Road
Ithaca, NY 14850
---- Joe Papworth via TenTec <tentec@contesting.com> wrote:
=============
Hi Kris,
Thanks for the info.
It sounds like that store proprietor had gone a few rounds with some rigs. Hi hi
I'll try the tubes by adding one at a time tomorrow.
Say, does your Centaur make a loud in-rush clunk when you fire it up?
And where did you buy your matched set?
Later, Joe, K8MP
Sent from AOL Mobile Mail
-----Original Message-----
From: km2km <km2km@twc.com>
To: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Sent: Tue, Jan 26, 2016 06:28 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 <<a
href='mailto:tentec@contesting.com'>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 <<a href='mailto:n4py3@earthlink.net'>n4py3@earthlink.net>
To: wb5jnc <<a href='mailto:wb5jnc@centurytel.net'>wb5jnc@centurytel.net>;
Discussion of Ten-Tec Equipment <<a
href='mailto:tentec@contesting.com'>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
<a href="http: www.n4py.com" target="_blank">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<<a
>> href='mailto:xtraham58@hotmail.com'>xtraham58@hotmail.com>
>> To: Discussion of Ten-Tec Equipment<<a
>> href='mailto:tentec@contesting.com'>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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