[Amps] Eimac AS-47 2m 8877 amp?

jeff millar wa1hco at wa1hco.net
Fri Jan 18 02:08:40 EST 2013

Used one for years for our VHF Contest group and rebuilt it several times.

C5 is a flat copper plate about 10 cm wide and 5 tall.  It has flexible 
brass sheet on each end that wraps back to ground to the aluminum box.  
The brass is U shaped and acts as a spring to suspend the flat plate.  
The tube has a copper ring that connects to the anode lines and has 
another flat sheet of copper soldered to it to make the plate.

I glued teflon sheet (treated to make it glue-able) to the tune and load 
plates to avoid dramatic events if the tuning every got too aggressive.

Look at http://www.qsl.net/dl4mea/2g35.htm for a similar design using a 
Also look at http://www.nd2x.net/base-1.html for a bunch of designs.

jeff, wa1hco

On 01/17/2013 05:40 AM, PY1NB - Felipe Ceglia wrote:
> Hello,
> Has anyone here ever built such an amp?
> I'd like to see pictures of its internals, if possible.
> I am not sure how C5 connects to ground, seems like the brass tube would
> fit and move directly to a hole in the aluminum chassis?
> Here is an AS-47 reprint: http://6mt.com/wpo2kwamp.htm
> 73,
> Felipe Ceglia - PY1NB
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