[Amps] Blower recommendations 8877 amp.

[Carl]

There are charts that relate blower speed and impeller diameter to cfm. 
Since the Eimac listing is for CCS commercial duty we hams get some slack at 
least for SSB/CW.

EBM-Papst appears to have the tightest tolerances and lowest friction which 
do cut down on the noise, especially when using a lower rpm motor.

Carl
KM1H


----- Original Message ----- 
From: "Charles Bibb" <zedkay at telepak.net>
To: <amps at contesting.com>
Sent: Tuesday, August 07, 2012 3:52 PM
Subject: [Amps] Blower recommendations 8877 amp.


>
> I'm looking for specific blower recommendations for a HB 8877 amp.
> (blower maker and model #).
>
> Everyone says use a Papst blower because they are quieter.  I use a
> Papst fan in my HB 2x3-500 amp.
>
> I have several blowers here. The ones that obviously move enough air
> are WAY too loud! The quiet ones I'm not sure about. They seem to
> move plenty of air, but don't produce the amount of water level
> change recommended by Eimac.
>
> I built a liquid tube manometer gauge to measure the back
> pressure.  Only the loudest can deliver the minimum 0.41 inch change
> in water level that Eimac recommends for the 8877.  Surely, there are
> compromises that work just fine.
>
> What blower are you guys using in your single 8877
> amps?  Recommendations, anyone?
>
> 73,
> Charles - K5ZK
>
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