>From: "Fern Rivard" <crc@cyberlink.bc.ca>
>To: <amps@contesting.com>
>Subject: [Amps] wanted suitable blower for 8877 tube
>Date: Sat, 18 Aug 2007 16:48:03 -0600
>
> I thought that I had a proper blower for my hb 8877 hf amp but it ends
>up that it's too small so now I'm looking for a suitable blower with a
>flange for this amp. Any and all suggestions are welcome.
I recommend the EBM range of blowers.
For my 2m W6PO amplifier I used a EBM G2E120-AR77-01. This is flange
mounting and air filters are available. This is larger than what would
normally be required to typically cool a 8877 because at the time I planned
to operate the amp in high duty cycle modes such as WSJT at a QTH having an
altitude of almost 10,000ft!
If you are at or near sea level, or plan to use the amp with a low duty
cycle you could probably use one of the smaller EBM blowers.
Remember the cooling comes from the mass of air passing through the anode.
You need to increase the airflow at higher altitudes due to the lower mass
per given volume of air.
Remember the EBM blowers don't automatically come with the capacitor, or at
least not here in the UK. They need to be ordered separately. The datasheet
for the blower will give the recommended part number.
Regards
David G4FTC
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