miller&kreisel plate amp trouble

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I recently bought two little k-9 subs and one had a big decrease in power. Full gain on it equals 1/3 gain on the one thats functioning right. The gain control seems to be working, it does adjust theres just a lot less power flowing. Someone mentioned checking that. This sub lost all its headroom and I'm hoping its something minor. If anyone is familiar with these and has thoughts to offer I would appreciate it.
 
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