>On Thu, 05 Feb 1998 16:08:44 -0500, Doug Person <ki6bq@ibm.net> wrote:
>
>>I am contemplating a first attempt at building an amplifier. I am
>>thinking of one that could produce a half KW (or more)on all bands from
>>160 through 10 meters, be seriously rugged with a heavy duty cycle, and
>>yet be made of parts that are readily available.
>>
>>I have been reading the posts to this reflecter and have been most
>>impressed with the kind of knowledge possesed by several participants.
>>
>>It has become more and more difficult to find interesting projects with
>>which to enjoy this hobby (I've built so many antennas), that I thought
>>assembling an amp would be interesting, educational, fun, and result,
>>hopefully, in a very usable piece of equipment.
>>
>>I would sincerely welcome everyone's input. What type of tubes, power
>>supply, meters, etc would be best for a first amp? Source of parts?
>>Potential cabinet sources?
>>
>>Tnx es 73 to all,
>>
>>Doug -- W4DXV
>_______________________________________________________________
>I'm sure you'll get lots of good advice, but I'd like to pass along
>something I learned the hard way: Use really large wire in your tank
>coil, especially on 10 meters. Wire that works fine for 40 or 20 will
>overheat on 10.
amen. This is seemingly one of the oversights in the AL-1200 and 1500.
>The ARRL handbook has a chart of recommended wire
>sizes for each band - believe it!
E.F. Johnson used to rate #12 ga. copper wire inductors for 5A max.
>For my 1500 watt amp I eventually
>got up to #4 solid copper earth ground wire before things ran cool
>enough.
Some commercial amplifiers employ forced air cooling on tank inductors
and on tank bandswitches. .
Rich...
R. L. Measures, 805-386-3734, AG6K
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