Thanks for the info, its help a BIT.
The real mystery is how to make the tuner to change frequency, I GUESS is I2C or other serial protocol is used to change, I tied to change the tuner supply voltage "+30v", it is working but very ruff. I collected more than 10 VCR for this project, any specific brand is better than the other tuner?
I think most of the tuner has the RF and IF on the same board.
It is not a stone age VCR's, 1-4 years old..
Anything else you can help, PLEASE...
STEVE