Well, A bit of an update on my new toy.. I tested it today, after repairing some solder joints that were not up to my specs and replacing some wire I didn't like that looks of.
The test was: Icom IC-718 --> MFJ-949E antenna tuner-->Amplifier-->Daiwa 3kw watt meter-->MFJ legal limit dummy load. The IC-718 will do 100 Watts on CW/SSB/Rtty and 40 watts on AM I used the frequency of 3870 kHz I first used a RTTY signal Input from Rig - Output from Amp - Grid Current (amps) - Plate Current (amps) 30 - 180 - .02 - .24 50 - 380 - .07 - .34 60 - 400 - 0.1 - .36 75 - 410 - 0.2 - 0.4 Next I tried an unmodulated AM carrier 25 - 200 - .04 - .26 40 - 375 - 0.1 - .34 Final Check was on SSB, modulated to the peak ALC setting with a 1 kHz tone. 30 - 110 - .02 - .16 40 - 200 - .02 - .18 50 - 210 - .02 - .22 60 - 300 - .04 - .22 70 - 375 - .04 - .24 80 - 400 - .06 - .26 I figured 80 watts was about as hard as I want to drive it. I don't have a High Voltage test lead here to actually check the plate voltage, but I am going to take this featherweight (NOT!!!) into work with me and check it out there. Here are some more photos, including the guts. I may just rewire this thing for my own piece of mind. http://riley-music.com/BowsStuff/AMP/14Guts.JPG http://riley-music.com/BowsStuff/AMP/15TubeSockets.JPG http://riley-music.com/BowsStuff/AMP/16Relay.JPG http://riley-music.com/BowsStuff/AMP/17PWRSection.JPG http://riley-music.com/BowsStuff/AMP/18MeterSwitch.JPG http://riley-music.com/BowsStuff/AMP/19CapChoke.JPG http://riley-music.com/BowsStuff/AMP/20FilTranny.JPG http://riley-music.com/BowsStuff/AMP/21PWRTranny.JPG http://riley-music.com/BowsStuff/AMP/22CoilSwch.JPG I guess now I need to figure out how to do a few things.... Get an opinion from someone who knows something about amplifiers and homebrewing.... 1. Make it band switch able for 80/40/20/10 2. Figure out a tuned input for the above bands 3. figure out how to get it up to a 600 watt output level (because everyone tells me the first 600 watts are the best for signal boost) Bow W5EFR -- No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.5.446 / Virus Database: 269.5.7/771 - Release Date: 4/21/2007 11:56 ______________________________________________________________ AMRadio mailing list List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Partner Website: http://www.amfone.net Help: http://mailman.qth.net/mmfaq.html Post: mailto:[email protected] To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body.
