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If you try to directly key an older amplifier without a relay buffer you WILL burn up your rigs keying circuit. Non ALC amp relay cable that fits the Icom IC-7410 and IC-9100. ALC is likely to cause you more frustration than good.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.