KA2YKC@aol.com wrote:
>
> Good evening;
>
> I am in the process of repairing a 76CA for a friend. It appears that the
> tubes are weak. Rathert than paying top $$ for 3 - 3cx400's, I remember seeing
> someone mention a web site regarding a convversion to 2- 3cx800's. Does anyone
> know the URL for the site ?
>
> Also, other than the heater voltage going to 13.5v, should the input and
> output circuits be compatible, or do I need to modify the tank or input ?
>
> I thought I saw someone mention using a voltage doubler rather than adding a
> 13.5v transformer. Is this possible ?
>
> Lastly, in order to lower the resonant freq of the plate choke, do I need to
> add turns or remove turns ? Any rough idea as far as the turns/Mhz ratio ?
> (10/12m issue)
>
> Many thanks to all for the ongoing education in amplifiers via the reflector.
> I was born 20yrs too late (solid state era) to get a "traditional" education
> in tube amplifer design.
>
> 73 Eric
>
Although I'm afraid you will be disappointed, you may find the following
site of interest.
http://www.jps.net/n4uq/index.htm
73,
--
Ken K4XL
grimm@lynchburg.net
BoatAnchor Manual Archive - http://bama.sbc.edu/boatanchor
or ftp://bama.sbc.edu/boatanchor
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