Another solution is do to what this guy did
https://forum.audiogon.com/discussions/dc-offset-blocker-killer-where-to-buy-in-the-usa where he whined that no one was willing to help him that McIntosh did not reach out to help him that contributors, posters, and users of this forum did not help him and so he was prepared to do nothing but decide to burn his amplifier because it was his right to do so it was under warantee but he was not willing to pay the shipping cost to return it to the factory!
https://forum.audiogon.com/discussions/dc-offset-blocker-killer-where-to-buy-in-the-usa where he whined that no one was willing to help him that McIntosh did not reach out to help him that contributors, posters, and users of this forum did not help him and so he was prepared to do nothing but decide to burn his amplifier because it was his right to do so it was under warantee but he was not willing to pay the shipping cost to return it to the factory!