What is this tube? http://cgi.ebay.com/EIMAC-Transmitting-Tube-YC-229-3CX1500Z7-/220534031896?pt=LH_DefaultDomain_0&hash=item3358da4618#ht_500wt_922 I can't find any data sheets on CPI/Eimac's homepage 73's Ulf (SM0NOR) ulf at sm0nor.com