My Yaesu FL2100z Amp which covers all ham bands between 1.8 mHz and 29.7 mHz cost me all of USD$600 (used) It came with a FUBAR swr meter, and I spent maybe $50 on NTE584 diodes (from http://www.mouser.com
) to get it to work. The ONLY thing I miss when using the Amp is QSK.
I am sorry but my pocketbook cannot afford the USD$3500 for an overpowered TenTec linear with QSK added. The legal limit in Canada is 1000 watts DC plate INPUT power, and I see no point in buying an amplifier capable of 1500 watts OUTPUT on CW. Besides, in this apartment, I only have access to 117 VAC (122 VAC keyup, 114 VAC keydown) so as you can tell, I had better not try a more powerful linear on this wiring?! (1 VAC of this drop is due to my Icom IC-706mkiiG exciter)
As a side note, here in Canada it is only lawful to possess Amplifiers which can QRO less than 3 DB above the Canadian Legal Limit for your license class. This makes the TenTec amplifiers have questionable legality, even though I, as an Advanced amateur, am allowed the high power limit of 1000 watts DC plate INPUT power. Hams with only the Basic qualification are restricted to a few hundred watts (the details escape me) so that, in general, they may not even possess most linears.