HELP! Need Operation Manual on Yamaha CT-810 tuner

I need to get a free PDF copy of the operation manual of a Yamaha CT-810 tuner. I bought the tuner in the mid-seventies and lost my original manual. I tried to get a free manual on the web, but every web site is asking to register for an e-book subscription with credit card, which I am not willing to do. The best that I have found is a copy of the CT-800 tuner, which is an upscale version of the CT-810. 

I appreciate any help on this!

Thanks you in advance.