Date   : Sat, 16 Feb 2008 08:22:02 +0000 (GMT)
From   : info@... (Sprow)
Subject: Master 128 colour composite

In article <47B60AD0.7010108@...>,
   allison Pell <trucker.allikat@...> wrote:
> Sprow wrote:
> > In article <47B5D473.4090803@...>,
> >    allison Pell <trucker.allikat@...> wrote:
> >   
> >> There seems to be a disagreement on the web about which legs of Q12 and
> >> Q13 are bridge with a capacitor to make colour composite video output.
> >> Young Mr. Wolstenholme's site suggests to put it from the Base of Q13 to
> >> the Emitter of Q12. This works, but gives a bit of a fuzzy picture,
> >> while Sprow's
> >> page on the same subject suggests the Emitter of Q13 to the Base of
> >> Q12. 
> >
> > I think you misread, my page says Q12e -> Q13b too,
>
> You're right, I did misread.  However, Q12b to Q13e seems to give a
> better colour picture.
> Any reason why that could be bad for the machine?

That way round the chroma chip is having to drive into the 75R load of the
monitor directly (I suspect the UHF output therefore wont look too good!),
but there's plenty of series resistance to limit the current so it should be
OK,
Sprow.