Finally I put a trim pot of 100 ohm.
On this tv (pic) I have to adjust the trim pot at 27 ohm to get this screen.
On another TV (LCD or other) adjusted to 80 ohm.
At least you used a trimpot from the same era

With an emitter follower you need a resistor to ground from the emitter, maybe a series resistor of 75 ohms to the TV input might help too, some TV also react strange to DC voltages so a relatively large series capacitor (220 uF) resolves this.