A couple of suggestions: Rather than convert it to another cooling type you
might consider removing the blower and mounting it outside or in the next room
or even under the table and running an air duct to the amp.
The other thing that may work is to add a selected size capacitor in series with
the blower to slow it down some. That will reduce the noise greatly. As most
military amps have much more air than needed you may be able to do this.
I did it on a TMC amplifier with a PL172 (similar to 4CX1000). I installed a
thermal switch above the tube to short out the capacitor and give full blower
speed if the air got too hot coming out of the tube. The only time the blower
goes to full speed is if there is a long winded transmission.
73
Gary K4FMX
Xu wrote:
> Hi!
> Thank you, and thank who reply my message.The things is :I have a 1.6KW
> Chinese Military ISB transmitter.but the blower is too noisy.I wat to cool
> the tube
> (Chinese FU-100F, 4CX1000A can replaceit) use transformer oil.
> Thanks !
> Xu
>
> ----- Original Message -----
> From: "Jim Strohm" <jstrohm@texas.net>
> To: "Xu" <salers@hamal.freemail.ne.jp>
> Sent: Wednesday, February 27, 2002 5:15 AM
> Subject: Re: [Amps] Oil cooled
>
> > >Does anyone heve expermence in oil cooled vacuum tube rf amplifier?
> >
> >
> > Do you mean externally oil cooled tubes, when the external envelope of the
> > tube is placed in an oil bath, or internally oil-cooled, where the oil is
> > circulated through the anode structure in a liquid-cooling enclosure
> > engineered for that purpose?
> >
> >
> > I have some limited anecdotal experience with both.
> >
> > jim N6OTQ
> >
> >
> >
>
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