Hi Ron,
The main air flow is through the anode by the large blower.
That is quite common with VHF/UHF amplifiers in Europe.
The cathode area is cooled by that separate fan. Of course the amp is
mounted with the tube vertical.
Cooling through the anode and use of a bypass duct to the cathode area is
quite common in Europe.
Almost every commercial VHF/UHF amp is constructed like that.
73
Peter
-----Original Message-----
From: KA4INM [mailto:ka4inm@gmail.com]
Sent: Dienstag, 18. März 2014 14:52
To: Peter Voelpel
Subject: Re: [Amps] 4CX5000A in grounded-grid
Hi Peter DJ7WW Voelpel:
> That 2m amplifier is not run zero bias but with normal screen and grid
voltages for AB1.
> Power gain is about 13db.
> I know the builder quit well.
> You see more photos on his web site:
> http://www.dj5dm.de/DJ5DM%20R17%20QRP%20Tube/index.htm
Does he operate it with the blower on top or with the blower on the
bottom?
This is the first time I ever saw a tube being blown from the top. Very
unusual construction.
--
Ron KA4INM - Youvan's corollary:
Every action results in unwanted side effects.
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