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(A friendly all ham family run U.K. service) Challenger 3, 1500W+ HF Amplifier. Brand New + Warranty The Challenger III uses a Russian GS35 ceramic triode valve. This is a very rugged valve,which is capable of producing high power for long operating periods. The Challenger will cover all the HF bands,10-160m with separate band positions for the WARC bands. There is a massive 2.2kVA toroidal transformer producing 3600V after the voltage doubler board. Cooling is forced air from a Papst flatpack blower located just under the transformer. The Challenger III features a new Triode board specially designed by G3SEK,which provides protection for, grid over-current, plate over-current, over-drive and internal valve flash-over. It also provides soft-start,warm-up timer,sequenced relays and high speed switching relay. x 9.5in high x 17in deep 410mm x 240mm x 475mm We do not accept foreign (not British) Cheques and Money Orders |