[Amps] SS amps watercooling - was PowerGenius XL

[Thomas Walsh]

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 at rogerhalstead.com>
> To: amps at 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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