[Amps] SS amps watercooling - was PowerGenius XL

[Roger (K8RI)]

For those who want it, it's "RELATIVELY" easy to convert an air cooled 
tube to a water cooled tube.  Note, I emphasized "relatively" easy.

Vapor phase cooling benefits from the proper amount of turbulence to 
prevent hot spots from developing. As for strait water cooling the air 
cooled radiators have plenty of area to transfer heat to the water.  The 
entire air cooled fins can be removed and again the heat transfer 
benefits from a bit of properly directed turbulence.

Keep in mind, these smaller tubes are fragile and will likely, still 
require fan cooling of the cathode/filament connection area.

Water cooling of SS amps is little more than routing the copper tubing 
that caries the water through the heat spreader is required.Using cool 
water requires little flow, but it's important to maintain a flat 
surface on which to mount the semiconductors as well as a flat surface 
between the spreader and any heat sink.As for cooled, or chilled water, 
be careful of condensation.

The heat sink compound is required to allow for "MINOR" irregularities 
in the surface to surface interfaces.

Typical, modern SS devices require somewhat less cooling than the 
equivalent tube amps as they have no heat generated by a filament

73,  Roger (K8RI)

On 2/27/2017 2:23 AM, Jim Thomson wrote:
> Date: Sun, 26 Feb 2017 08:38:24 -0700
> From: Thomas Walsh <w2co at comcast.net>
> To: Jim Thomson <jim.thom at telus.net>
> Cc: amps at contesting.com
> Subject: Re: [Amps] SS amps watercooling - was PowerGenius XL
>
> 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
>
> ##  Alpha never produced a water cooled amp.  The 70V  was
> vapor phase cooled.   Alpha  stopped making  the 70V after Eimac announced
> they would stop producing the  vapor phase  cooled triode used in the 70V.
> Which I think was the vapor phase cooled version of an 8877.  Back then,
> Eimac produced a   lot of vapor phase cooled triodes.   They discontinued
> all the smaller vapor phase cooled triodes, and notified Apha at the time.  I
> remember at the time, that Alpha notified all its 70V owners, that Eimac would
> be doing one last production run of the vapor triodes used, so put in your
> order.
>
> ##  Back then, what was left was just the larger Eimac vapor cooled triodes, and tetrodes.
> As of 5 min ago, Eimac depicts only 4 vapor cooled large tetrodes on their site,
> and no vapor cooled triodes at all.   Eimac still makes  1-2  multi phase cooled tubes.
>
> ##  So the 70V  was short lived in production.  Cant produce the amp, if eimac doesnt make the
> tube anymore.
>
> Jim   VE7RF
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