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Re: [Amps] wanted suitable blower for 8877 tube

To: "Tom Rauch" <w8ji@contesting.com>,"Mike, K6BR" <noddy1211@sbcglobal.net>,"'Fern Rivard'" <crc@cyberlink.bc.ca>, <amps@contesting.com>
Subject: Re: [Amps] wanted suitable blower for 8877 tube
From: "jeremy-ca" <km1h@jeremy.mv.com>
Date: Sat, 18 Aug 2007 22:28:38 -0400
List-post: <mailto:amps@contesting.com>
So if the larger one is used then by slowing it down just a bit would keep 
the tube cool and reduce the noise somewhat, correct?

Would it adequately handle two 8877's?

Carl
KM1H


----- Original Message ----- 
From: "Tom Rauch" <w8ji@contesting.com>
To: "Mike, K6BR" <noddy1211@sbcglobal.net>; "'Fern Rivard'" 
<crc@cyberlink.bc.ca>; <amps@contesting.com>
Sent: Saturday, August 18, 2007 10:20 PM
Subject: Re: [Amps] wanted suitable blower for 8877 tube


>> How about using the Fan from the Ameritron AL-1500, I
>> think you can buy it
>> online from Ameritron, It works well and is pretty quiet
>> if you drop a
>> resister in line and slow it down a bit.  I think the part
>> is
>> Number is 410-3737.
>
> That blower is already at the minimum possible size with
> full line voltage for ICAS duty at 1500w output CW or SSB.
> If you add a resistor to "slow it down", you will not make
> safe airflow under almost any duty cycle.
>
> http://www.ebmpapst.us/allpdfs/G2E085.PDF
>
> For heavy duty cycle applications Ameritron recommends the
> larger capacitor run blower, but no one ever likes it. The
> extra 20dB noise stops people from using it.
>
> When initially released the larger blower was used but about
> 2/3 of the amps were returned  because of noise, so the
> slower G2E085 was substituted.
>
> By the way, after trying dozens of blowers the EBM G2 series
> was the quietest blower for a given airflow. The impeller
> hub is actually the rotor of the motor.
>
> 73 Tom
>
>
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