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.
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.
73, de Mike, K9UW
-----Original Message-----
From: tentec-bounces@contesting.com [mailto:tentec-bounces@contesting.com]
On Behalf Of Josh
Sent: Saturday, December 25, 2004 8:18 PM
To: tentec@contesting.com
Subject: Re: [TenTec] Centaur
I too am using the Taylor 572B's in my Centaur. Works FB. Also have a
Titan III,
so don't use the Centaur much due to the fan noise. What mod. (size) Papst
57 CFM
do you use? Would like to use the Centaur on ssb too. 73 de Josh, N4VB
----- Original Message -----
From: "Mike Pagel" <k9uw@wi-net.com>
To: <tentec@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
> replaced the original 811's with Taylor 572B's from RF Parts and
> replaced the original 100 CFM fan with a 57 CFM Papst fan at the same
> time. The amp now runs cooler, quieter, and produces 6-700 watts.
> Others have replaced the original fan with units as small as 25 CFM
> 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@contesting.com
> [mailto:tentec-bounces@contesting.com]
> On Behalf Of joel hallas
> Sent: Saturday, December 25, 2004 5:12 PM
> To: tentec@contesting.com
> Subject: Re: [TenTec] Centaur
>
>
> Ron,
>
> Great question, and I will be watching the answers closely too. I
> fried an 811A in my Centaur the other day and can see the bottom of
> the spare bin very clearly now!
>
> The big question is, when I toss my last spare 811A, should I go with
> 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
> Taylor 572Bs offered by RF Parts will be as good. Anyone have good
> 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
>> suggestions on the best place to get replacements, and the best
>> 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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>> TenTec@contesting.com
>> http://lists.contesting.com/mailman/listinfo/tentec
>>
>
>
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