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Only the Ameritron AL-811H gives you four fully neutralised 811A transmitting tubes. You get absolute sustainability and superb performances on higher bands that can't be matched by un-neutralised tubes.
Ameritron mounts the 811A tubes vertically -- not horizontally -- to prevent hut 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 20CFM computer grade fan -- not an open frame phonograph motor -- draws in cool air to pressurise the cabinet and efficiently cool your 811A tubes for an extra long life.
You also get efficient full-size heavy duty tank coils, computer grade capacitors, heavy duty high silicon core power transformer, slug tuned input coils, operate/standby switch, transmit LED, ALC, dual meters, QSK compatability with QSK-5 option and much more!