In a message dated 5/21/06 7:37:43 AM Eastern Daylight Time, [EMAIL PROTECTED] writes:
> 3. 200 Watt PEP (input) 6146 desk-top AMPLIFIER: > solid state devices use Si, Bo, Arsenic, dopants, > and vias - to create roadways for e's. Vacuum tubes, > have a gaseous layer ???? Vacuum tubes have just that - a vacuum. - which allows a bit of > > latitude for resiliancy, "echo", springiness, > and an ability to take load and drive jolts. > They also can exhibit negative R! > Doesn't make any difference to the RF. > Listen to a HW-32 200W PEP on SSB = clear, > sharp, powerful audio. Listen to a 15W solid > state amp device = much weaker, a bit anemic, > a bit flat. Of course it's going to be weaker - it's 7 db less power! Ask the Russians - it is said, > > many of their 90's fighter aircraft had tube > xmtrs and rcvrs. (quite dependable they say) > The Soviets used tubes because of their ability to withstand EMP - and because they did not have the industrial capacity to make enough advanced semiconductors. > Secret? = hot 12VAC filament, and evacuated > gaseous layer! Ask the VARIAC folks! > > ???? If Elecraft could market a BACKER TUBE AMP > > project- one we hams could complete as a "project" - > FCC would be happy, and we'd have our toaster-size > 200W PEP input amp next to our K2's - for those > of us (I suspect MANY) hams would want to use. > How much would you be willing to pay for it? Such an amplifier would cost considerably more than a KPA100. > The ICOM IC-706 folks are still trying to solve the > "problematic" finals in this 2006 rig. The IC-706 is a lot older than 2006. And one poor final design does not mean a technology is better or worse than another. There were manufactured tube rigs that were very hard on the bottles. Silicon - > > does not like punishment, static, radiation, > heat, or mechanical stress, ground or lack of > ground situations, ignition noise, mobile static, > .............. > True. Tubes have their weak points as well. 73 de Jim, N2EY _______________________________________________ Elecraft mailing list Post to: [email protected] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
