New Patreon Tier and Early Access Content available. If you would like to support AVForums, we now have a new Patreon Tier which gives you access to selected news, reviews and articles before they are available to the public. Read more.
James, looking through the ES20 manual, there are no codes given for an Yamaha TVs (do they make any?), so I would guess the answer is no.
If you have a friendly retail outlet near you maybe they would be willing to let you borrow a remote and a copy of the manual and you could try out all the various codes.
Alternatively if you could take the remote for your amplifier into them maybe they could 'read' the signal it puts out using a multi remote and then compare it with the various signals of the ES20 (assuming the yamaha has a remote, or you haven't lost/broken it, hence the request )