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6 position antenna switch
It lets you use your linear amplifier for high power QSK CW
A fourth scale switches among peak reflected power (and SWR)
they all have to be replaced
full band coverage
AL-811HX, HFAMP, 800W, (4)811ATUBES, EXPORT240VAC Cooling Fan 6 position antenna switchOnly the AMERITRON AL 811H gives you four fully neutralized 811A transmitting tubes. You get absolute stability and superb performance on higher bands that cant be matched by un neutralized tubes. AMERITRON mounts the 811A tubes vertically, not horizontally, to prevent hot tube elements from sagging and shorting out. Others, using potentially damaging horizontal mounting, require hard to find 811A tubes to retard harmful sagging and shorting. Powerful