[Top] [All Lists]

Re: [Amps] wanted suitable blower for 8877 tube

To: "Tom Rauch" <>,"Mike, K6BR" <>,"'Fern Rivard'" <>, <>
Subject: Re: [Amps] wanted suitable blower for 8877 tube
From: "jeremy-ca" <>
Date: Sat, 18 Aug 2007 22:28:38 -0400
List-post: <>
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?


----- Original Message ----- 
From: "Tom Rauch" <>
To: "Mike, K6BR" <>; "'Fern Rivard'" 
<>; <>
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.
> 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
> _______________________________________________
> Amps mailing list

Amps mailing list

<Prev in Thread] Current Thread [Next in Thread>