[Amps] Tube Cooling..

[DJ7WW]

All commercial cavity amps I saw, made by Siemens, R&S and Plisch provide
cooling a different way.
They pressurize the cavity with the blower and the only way for the air to
escape is through the anode fins of the tube sitting on top of the cavity
tubing and through the air outlet above the anode.
They provide also a bypass hose from the blower into the cathode chamber.

73
Peter 

-----Original Message-----
From: amps-bounces at contesting.com [mailto:amps-bounces at contesting.com] On
Behalf Of Ian White GM3SEK
Sent: Samstag, 27. November 2010 17:54
To: amps at contesting.com
Subject: Re: [Amps] Tube Cooling..

Carl wrote:
>
>----- Original Message ----- From: "Ian White GM3SEK" 
><gm3sek at ifwtech.co.uk>
>To: <amps at contesting.com>
>Sent: Saturday, November 27, 2010 3:06 AM
>Subject: Re: [Amps] Tube Cooling..
>
>
>> Carl wrote:
>>>
>>>Top down cooling is the norm in many coaxial cavities at VHF/UHF. My
>>>Collins 432 MHz military amp with a 2.75KW dissipation tetrode runs
>>>that way and it was used as an AM linear at 1000W out. A seperate small
>>>blower cools the input side. Due to the TX/RX relay and the coax going
>>>to the hardline and antennas I cant run it even close to its
capabilities.
>>>
>>>I'll also be using that method at 1296 with a pair of  GI-7B's unless I
>>>decide to go with water cooling.
>>>
>>
>> Do you really mean "downward through the anode cooler", Carl?
>
>Yes
>
>Carl
>KM1H

So the entire anode cavity fills up with hot air...

Collins contributed many excellent ideas to the amplifier gene pool, but 
that certainly wasn't one of them.



-- 

73 from Ian GM3SEK
http://www.ifwtech.co.uk/g3sek
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