"Mike Coatham" wrote in message ...
"Jonathan Ives" wrote in message
m...
Hi,


has anyone modified either the Aux (100mv) or CD/Aux (300mv) input
modules on a CD input for better results with highish outputs from
CD/DVD ?

I don't have a low output radio and so replaced the 1M shunt with
470K, but still not too much control. Before dropping to 100K or even
47K I thought I'd see if anyone has found the best balance. I also
noticed that the potential divider on the TL072 output on the aux and
CD/Aux are different ? Anyone experimented. I have 2 CD players and a
DVD player, but there output levels appear to differ considerably.

BTW I *know* the current religon is to replacxe the OpAmps, but I'm
sticking with the originals as they sound fine to me, just want a bit
more control on volume.
Yes, I have converted an early Radio module to the CD module. I had a
genuine CD/Aux module from Quad and just changed the older module components
to suit. The component changes a
Reduce R200 & R201 from 1M to 470K (you've done this already).
Reduce R202 & R203 from 2K2 to 1K5
Reduce R204 & R205 from 3K3 to 820R

Mike

Many thanks Mike,

Hmmm, maybe I got the 202/204 & 203/205 the wrong way round but I
tried this as this is the arrangement on the CD/Aux TL072 300mv/500K
input. I found I was getting very little volume range i.e it was too
lund at 4 on the Quad 44 dial. This was worse than I was getting on
the CD/Aux input which I have left alone

Maybe my CD player (ISOmagic DAC) or Sony DVD player sources are too
high ? I know some peak at 2.4v in order to sound "better" in an A-B
comparison in your average retailer. How much volume range do you have
using the Radio as a CD input ? I'm using the 1.5v outputs (as opposed
0.5 or 5v) into a Radford STA15 with very inefficient LS3/5a speakers.