[TenTec] Centaur

[Mike Pagel]

Here's the fan that I used in my Centaur, Josh:

http://www.mouser.com/catalog/620/1223.pdf

Look for item #59121-4800X, a bit more than half way down the page.
119x38mm, 57 CFM.

While I am confident that the amp runs cooler now than it did, I do not =
have
specific evidence of that - other than placing my hand over the tubes =
while
I'm operating.  In the future I'm going to try a 25 CFM fan but will =
take
before and after temperatures of the exhaust air to see if the reduced =
air
flow is an issue or not. =20

Centaur reviews on eHam (http://www.eham.net/reviews/detail/155) =
provided me
with several contacts who were happy to discuss their airflow mods.  For
what it might be worth, another op reported achieving significant =
reduction
in fan noise by covering replacing the original 100 CFM fan with a 25 =
CFM
fan and then covering the intake of that with a snap on grill and =
filter.
He told me that he grill/filter combination reduced the high pitched =
intake
noise, resulting in the amp making about as much noise as a PC.

Operating here is mostly CW with a weekly SSB ragchew on 160.  If I =
stand up
and lean over the top of the amp the blower can be heard (I use Heil =
boom
mike/headset).  Otherwise, I'm told that is not noticeable.  The amp has
seen use in several CW and SSB contests and has performed perfectly.
Frankly, I'm not sure I could have stood listening to the original fan =
for
48 hours.

Have not tried it with high duty cycle mode like RTTY. =20

73, de Mike, K9UW







-----Original Message-----
From: tentec-bounces at contesting.com =
[mailto:tentec-bounces at contesting.com]
On Behalf Of Josh
Sent: Saturday, December 25, 2004 8:18 PM
To: tentec at contesting.com
Subject: Re: [TenTec] Centaur


I too am using the Taylor 572B's in my Centaur.  Works FB.  Also have a=20
Titan III,

so don't use the Centaur much due to the fan noise.  What mod. (size) =
Papst=20
57 CFM

do you use?  Would like to use the Centaur on ssb too.  73 de Josh,  =
N4VB

----- Original Message -----=20
From: "Mike Pagel" <k9uw at wi-net.com>
To: <tentec at contesting.com>
Sent: Saturday, December 25, 2004 6:55 PM
Subject: RE: [TenTec] Centaur


> Hi Joel:
>
> Last February I bought a used Centaur that had a shorted 811.  I=20
> replaced the original 811's with Taylor 572B's from RF Parts and=20
> replaced the original 100 CFM fan with a 57 CFM Papst fan at the same=20
> time.  The amp now runs cooler, quieter, and produces 6-700 watts. =20
> Others have replaced the original fan with units as small as 25 CFM=20
> and report good results.
>
> I've got two left over Svetlana 811's.  Anyone interested in them?
>
> 73, de Mike, K9UW
> Amherst, WI
>
>
> -----Original Message-----
> From: tentec-bounces at contesting.com=20
> [mailto:tentec-bounces at contesting.com]
> On Behalf Of joel hallas
> Sent: Saturday, December 25, 2004 5:12 PM
> To: tentec at contesting.com
> Subject: Re: [TenTec] Centaur
>
>
> Ron,
>
> Great question, and I will be watching the answers closely too. I =20
> fried an 811A  in my Centaur the other day and can  see the bottom of=20
> the spare bin very clearly now!
>
> The big question is, when I toss my last spare 811A, should I go with=20
> 572Bs or stick with 811As? The 572Bs that everyone liked from Svetlana =

> don't seem to be available any more (source?) and I wonder if the=20
> Taylor 572Bs offered by RF Parts will be as good. Anyone have good=20
> luck with them in a Centaur?
>
> Thanks for everyone's help!
>
> 73 & Merry Chistmas,
> Joel Hallas, W1ZR
>
> Ron Feutz wrote:
>
>> TT'ers,
>>
>> I cooked a tube or tubes in my Centaur while tuning up.  Any=20
>> suggestions on the best place to get replacements, and the best=20
>> replacements to get?  For the price I suppose it makes sense to get a =

>> matched trio.
>>
>> I see RF parts has quite a selection and the prices look reasonable.
>>
>> 73,
>>
>> Ron KK9K
>>
>>
>> _______________________________________________
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>>
>
>
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