Patrick Turner wrote:

John Stewart wrote:

This one is in RDH4. I'm a bit surprised no one has referred to it,
although I've not watched the posts too carefully recently. I know
several
out there have a copy of RDH4. Please excuse if someone has already
referenced this circuit.

See it at ABSE & ABPR

Cheers, John Stewart

What page in RDH4 has the improved detector?
Many of us *do* have RDH4.

I can't see anything about it at ABSE or ABPR.

Patrick Turner.

It shows up on page 1074 of my copy of RDH4.
This is an original I bought around 1956 while I worked at the
research division of Ferranti Electric. The publish date is February
1954.

Cheers, John Stewart