Arne is correct about the anode cooler being large. It is close to 100
mm (about 4") at the largest point near the bottom of the cooler. The
majority of the cooler is above that point and is made up of the ends of
each copper fin that is bent at a right angle forming what appears to be
a flat surface around the outside of the cooler. Actually, this part of
the cooler is very soft and is easily damaged. Take care if you decide
to clamp around the fin area. I wouldn't recommend using a hose clamp
because of the amount of pressure generated by them.
If you lay out the amp so the tube is horizontal with the top of the
tube facing the tank, connection to the threaded nut on top of the anode
is a practical method. Otherwise, if the tube is mounted vertical and
the tank circuit extends off to the side of the tube, it is better to
use a thin brass or copper clamp around the cooler in the solid area
just below the fins. This makes for shorter connections to the plate
choke and the rest of the tank.
73, Tony W4ZT
N7KA@comcast.net wrote:
>> The following was Larry, W7IUV'S question:
>>
>> What kind of gain can I reasonably expect from a GS-35B on 6 meters at
>> anode voltages less then 4 KV? The info I have found on the web is
>> sketchy and inconsistant. Most builders seem to avoid the issue of gain.
>> I have a number of options for the tube(s) in this amp project and am
>> having a hard time deciding which to build.
>>
>> 73, Larry
>>
>So far several responses have NOT EVEN addressed the question.
>
>Connection to the GS-35B would be a bit difficult with a fuse clip or
>snap rings. Take a look at a GS-35B and it is not like an 8877 or
>4CX1500. The anode is about 3.5 inches in diameter.
>
>Suggestion to Larry; Look at the ND2X website and there will be links
>and calls of folks who have the GS-35Bon 6M. Send them an email and
>ask about their operating conditions. Results should be actual >numbers.
>
>Just wish I was farther along on mine so I could give operating info.
>Oh well, it will get there. Until then it would be nice to know what
>others are getting for RF output vs RF input and at what parameters.
>Larry, I have NOT done what I suggest.
>
>Arne N7KA
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