Looking for Help

[Mac]

Hello all,,

First thanks for all the help on the hunter bandit. Now I ran into a person here in Az and he said he had built a Big Gun,as the ham folks called it, and said he would be interested in selling it. Its set up for am, has 3x813 tubes, weighs about 125-140 lbs,  he told me that my johnson viking would be a great driver and it should do 3000w, with no problems. I have included a pic of the unit. Just wanted some feedback from you guys that have more knowledge than I do. Im trying to learn as much as I can, 

Thanks for any help

Mac

[WA1GFZ]

I don't think 3 813s in class AB linear will handle that kind of power. Plate modulated class c 3 tubes could do about 750 carrier.
450 watts of dissipation I would limit my output power to a KW or so peak unless you blow a lot of air past them and run lots of volts on the plates.

[Bacon, WA3WDR]

Three 3-500Zs would be working to do about 2.5KW PEP output.  But an 813 is a little more than 1/3 of a 3-500Z.  I wouldn't expect more than 1000W PEP output from three 813s without cooking them.  Still not bad power-wise.

Nice looking rig.

[Pete, WA2CWA]

You know you're driving them hard when the cabinet and the front panel meters are glowing too.

[W3SLK]

I'd say maybe 3KW PEP running slopbucket but not AM in class AB as GFZ stated. Like with other 1KW rigs, don't expect much in the way of power gain. I would change it to class C and build a modulator and probably get about 750~800W AM. Now that would be a big gun!

[W1ATR]

Looks nice and clean, so if the price is right, it would make a nice little amp. As far as it being a "Big Gun", you would probably have to find room in there for maybe 5 more 813's before you got it to 3kW, but it looks like it was done real nice.

Maybe he ment to say 'Bird' watts.

SK