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@comcast.net>
To: Jim Thomson <jim.thom@telus.net>
Cc: amps@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
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
---
This email has been checked for viruses by Avast antivirus software.
https://www.avast.com/antivirus
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
|