[Amps] Blower recommendations 8877 amp.

[Bruce Osterberg]

Since you Asked Specifically for an 8877 Tube and a Part number for a 
Blower for that Tube, Here is My Recommendation and What I use on My 
W6PO Amplifier, That I use Key Down on EME with WSJT for a 60 Second 
Time Period:

FASCO NO 702111713 Type U21B  RPM 3030
1/25 HP .49 Amps at 115 Volts  Part Number 25-7615

73 Bruce N9BX 73

On 8/7/2012 3:14 PM, Peter Voelpel wrote:
> Hi Charles,
>
> The EBM-Papst model G2E085-AA01-01 will be sufficient for the 8877.
> Of course, any blower will cause more noise then a fan.
> If the tube is not run at full dissipation you can always reduce the blower
> voltage and by that the noise level.
> I use the G2E085 with 3x3CX800A7.
>
> 73
> Peter, DJ7WW
>
> -----Original Message-----
> From: amps-bounces at contesting.com [mailto:amps-bounces at contesting.com] On
> Behalf Of Charles Bibb
> Sent: Dienstag, 7. August 2012 21:53
> To: amps at contesting.com
> 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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