08-02-2008, 06:50 PM
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break on through
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Join Date: Mar 2006
everything you have there sounds great, except for the 2x4 amps.
the 2x4 amp as a design is just a bad idea to my mind.
its all about pushing transistors up into their saturation points and fooling wattmeters in my opinion.
you probably wouldnt have noticed in the mobile, but at home, those amps will most likely cause interference to your TV, computer, phone, or any number of things around your, or your neighbors house.
run the tube amp and you will always be happy.
im not sure about the drive for that amp, but i think it should be a low drive amp meaning that you should drive it with 2.5 to 3 watts deadkey, and no more than around 20 watts PEP. (swing)
ive read that the 12 tube elkin will do about 800 watts, and that they were built for big modulation, not big power numbers on the meter.
a guy named ray in NC built them back in the day and apparently he will still work on them. no idea how to contact him though.
make sure you read this, so you know how to TUNE and LOAD that amp, so you dont have to replace the tubes prematurely.
so, use your base station, or the 33, connected to the amp, and the amp to your wattmeter/SWR meter, then out to the antenna.
i would buy my own coax, as old stuff tends to have problems with water egress and other maladies.
get some belden 9913, or LMR400, or at least some new RG8u coax with ends put on the right way. (solder in all four holes on the PL259 connectors!)
length doesnt matter, just use enough to get from the radio room to the antenna and you will be fine.
inspect the coax you have and make the call yourself.
just remember how much it will suck if you have to replace it after you get everything up in the air!