FYI Alpha did produce a water cooled tube amp back in 70'
See https://www.alpharfsystems.com/?p=1387
There is probably a good reason they stopped..
W2CO
On Tue, 2017-02-21 at 19:20 -0800, Jim Thomson wrote:
> Date: Tue, 21 Feb 2017 20:11:08 -0500
> From: "Roger (K8RI)" <k8ri@rogerhalstead.com>
> To: amps@contesting.com
> Subject: Re: [Amps] SS amps watercooling - was PowerGenius XL
>
> Not sure what you are disagreeing with. Distilled water presents a high
> resistance when first used, BUT, distilled and de-ionized water is ion
> hungry, or rephrased, quite corrosive. It will take the strength out of
> brass fittings to the point where you can crumble them between your
> finger.. IE, hose barbs. It is the metal ions that increase the
> conductivity. Tap water (with no salt) is still conductive)
>
> As the water ages, the dissolved metal ions lower the resistivity.
> That's why we monitor the resistivity. Eventually the resistivity gets
> low enough that the water needs to be replaced with, fresh, clean,
> distilled water.
>
> 73, Roger (K8RI)
>
> ## distilled water is water that has been boiled, and the steam
> condensed back to water. Its pure water. AFAIK, distilled
> water is not ion depleted. If it is ion depleted, bad news, it will
> eat the insides out of any external rad used....esp Aluminum.
>
> ## de-ionized water is a chemical process, so you end up with pure
> water..... without having to go through the boiling process.
>
> ## You cant use 100 % distilled water in any eng or supercharger closed loop
> system, unless corrosion and rust inhibitors are used. 100% distilled water
> extracts a lot more heat vs a 50-50 mix of distilled water + glycol.
>
> ## so dunno if distilled water would work in a SS application. Do you
> really require
> the high resistivity for a 50 vdc device ? I thought there was an
> electrical insulating
> barrier between the LDMOS and its mating heatsink. If so, water resistivity
> is
> a moot point.
>
> ## Plane jane tap water is used for water cooled dummy loads. 20 kw into 50
> ohms = 1414 V peak. Those type of dummy loads are not an issue. Available
> up to 200 kw.
>
> Jim VE7RF
>
>
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