Should I remove my back porch video mod when I install a vLA81?

[gwpt]

I have the following back porch video mod in my ZX81 ("3. 555-Based Circuit" in the doc):

http://zx.zigg.net/misc-projects/ZX81_V ... ioning.pdf

and am about to install a vLA81, which also supports back porch video.

So should I:

A) remove my 555 mod (and replace it with the simple transistor mod) and use the uLA81's back porch feature
or
B) leave the 555 mod, and just disable back porch on the vLA81?

Would one be a better option than the other. e.g. better video quality etc?

Thanks

[Paul]

Remove the add-on and use output of vla81 directly.
You can't improve it's output.

[1024MAK]

I agree with what Paul said.

Mark

[gwpt]

When you say directly, do you mean wire ula pin 16 directly to the phono jack? Or should I still have the transistor/resistor between them?

[1024MAK]

The vLA81 manual says:

Personally, I would still use a transistor, resistors and capacitors as per the link in my signature below. At the very least, I would use a capacitor.

This is in order to provide at least some protection from the TV/monitor/ external device.

Mark

[gwpt]

Great, thanks for the help!