[TenTec] Model 411 amp (aka Centaur)
Al Sirois
alsirois at roadrunner.com
Thu Feb 4 12:52:43 EST 2016
TUBES..........My T-T Manual says to use 811-A, not 572-B.....>
I bought matched tubes from RF Parts in 1999 and they are still in the amp
and working fine. I got 450 W out of them this morning on 80 meters.
I do have spare 572-B's, but they are for my back-up amp a FL-2100-B.
I've never swopped the tubes between the two amps..... I probably don't want
to.
Good Luck with you guys in this discussion group.
N1MHC at arrl.net
Al Sirois
East Boothbay, ME 04544-0002
==========================
-----Original Message-----
From: Joe Papworth via TenTec
Sent: Thursday, January 28, 2016 9:54 AM
To: km2km at twc.com ; tentec at contesting.com
Cc: k8mp at aol.com
Subject: Re: [TenTec] Model 411 amp (aka Centaur)
Thanks Kris,
If I was desperate, I'd run it on two tubes.?
BTW- I haven't bit the bullet on a new tubes yet cuz from what I read on the
net, the ones on the market now just plain suck.
Seeeeeeeeeeeeya, Joe
-----Original Message-----
From: km2km <km2km at twc.com>
To: Discussion of Ten-Tec Equipment <tentec at contesting.com>
Cc: k8mp <k8mp at aol.com>
Sent: Thu, Jan 28, 2016 9:45 am
Subject: Re: [TenTec] Model 411 amp (aka Centaur)
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 at 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 at twc.com>
To: Discussion of Ten-Tec Equipment <tentec at 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='tentec at contesting.com?'mailto:tentec at contesting.com'>tentec at 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='n4py3 at earthlink.net?'mailto:n4py3 at earthlink.net'>n4py3 at earthlink.net>
To: wb5jnc <<a
href='wb5jnc at centurytel.net?'mailto:wb5jnc at centurytel.net'>wb5jnc at centurytel.net>;
Discussion of Ten-Tec Equipment <<a
href='tentec at contesting.com?'mailto:tentec at contesting.com'>tentec at 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='xtraham58 at hotmail.com?'mailto:xtraham58 at hotmail.com'>xtraham58 at hotmail.com>
>> To: Discussion of Ten-Tec Equipment<<a
href='tentec at contesting.com?'mailto:tentec at contesting.com'>tentec at 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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