[TenTec] Model 411 amp (aka Centaur)

k8mp at aol.com k8mp at aol.com
Thu Feb 4 17:58:33 EST 2016 

Don't change a thing Al.
"If it ain't broke, don't fix it"

Sent from AOL Mobile Mail


-----Original Message-----
From: Al Sirois <alsirois at roadrunner.com>
To: km2km <km2km at twc.com>; tentec <tentec at contesting.com>
Cc: k8mp <k8mp at aol.com>; Ron Sirois <n1opf at verizon.net>
Sent: Thu, Feb 4, 2016 12:52 PM
Subject: Re: [TenTec] Model 411 amp (aka Centaur)


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.

<a href="mailto:N1MHC at arrl.net">N1MHC at arrl.net</a>
Al Sirois
East Boothbay, ME 04544-0002
==========================

-----Original Message----- 
From: Joe Papworth via TenTec
Sent: Thursday, January 28, 2016 9:54 AM
To: <a href="mailto:km2km at twc.com">km2km at twc.com</a> ; <a href="mailto:tentec at contesting.com">tentec at contesting.com</a>
Cc: <a href="mailto:k8mp at aol.com">k8mp at aol.com</a>
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 <<a href="mailto:km2km at twc.com">km2km at twc.com</a>>
To: Discussion of Ten-Tec Equipment <<a href="mailto:tentec at contesting.com">tentec at contesting.com</a>>
Cc: k8mp <<a href="mailto:k8mp at aol.com">k8mp at aol.com</a>>
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 <<a href="mailto:tentec at contesting.com">tentec at contesting.com</a>> 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 <<a href="mailto:km2km at twc.com">km2km at twc.com</a>>
To: Discussion of Ten-Tec Equipment <<a href="mailto:tentec at contesting.com">tentec at contesting.com</a>>
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='<a href="mailto:tentec at contesting.com">tentec at contesting.com</a>?'<a href="mailto:tentec at contesting.com" >tentec at contesting.com>?'="">mailto:tentec at contesting.com'>tentec at contesting.com&gt</a>;
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='<a href="mailto:n4py3 at earthlink.net">n4py3 at earthlink.net</a>?'<a href="mailto:n4py3 at earthlink.net" >n4py3 at earthlink.net>?'="">mailto:n4py3 at earthlink.net'>n4py3 at earthlink.net&gt</a>;
To: wb5jnc <<a 
href='<a href="mailto:wb5jnc at centurytel.net">wb5jnc at centurytel.net</a>?'<a href="mailto:wb5jnc at centurytel.net" >wb5jnc at centurytel.net>?'="">mailto:wb5jnc at centurytel.net'>wb5jnc at centurytel.net&gt</a>;;
Discussion of Ten-Tec Equipment <<a 
href='<a href="mailto:tentec at contesting.com">tentec at contesting.com</a>?'<a href="mailto:tentec at contesting.com" >tentec at contesting.com>?'="">mailto:tentec at contesting.com'>tentec at contesting.com&gt</a>;
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: <a href="http://www.n4py.com" target="_blank">www.n4py.com</a>" target="_blank"><a href="http://www.n4py.com" target="_blank">www.n4py.com</a>

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='<a href="mailto:xtraham58 at hotmail.com">xtraham58 at hotmail.com</a>?'<a href="mailto:xtraham58 at hotmail.com" >xtraham58 at hotmail.com>?'="">mailto:xtraham58 at hotmail.com'>xtraham58 at hotmail.com&gt</a>;

>> To: Discussion of Ten-Tec Equipment<<a 
href='<a href="mailto:tentec at contesting.com">tentec at contesting.com</a>?'<a href="mailto:tentec at contesting.com" >tentec at contesting.com>?'="">mailto:tentec at contesting.com'>tentec at contesting.com&gt</a>;

>> 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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