Hej Bojsenbord
Der er gennem tiden lavt mange 303 om til mono - helt hvordan du ser det erjeg ikke klar over men prøv at spørge på
http://quadrevisionspot.blogspot.com/De skriver bla.a. om 33 mono/stereo
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Quad 33 Mono/Stereo facilities. Connect a CD player the right way
Quad 33 Control Unit Mono /Stereo switching facilities. And the optimum way to connect a CD player.
Mono Stereo facilities
There
are a lot of questions about these facilities, in most cases these
questions arise after the upgrade of a 33 Control Unit. As pointed out
below, the Disc, Radio1, Radio2 and Tape replay have different
mono/stereo functionalities. The only common thing is an input combined
with the Stereo button. This document is based on the circuit diagram
above serial number 11.500. Below serial number 7500 some functionality
is missing, in the last part of this paragraph you will find the
functional differences.
No pushbuttons activated
If no
pushbutton is activated, all the input signals are shortened to pin 2,
earth. Quad assumed in those days that all the sources could cope with
this situation. Check if all your source equipment can deal with short
circuit outputs!
Disc
Disc combined with «M : L+R to L output
Disc combined with M» : L+R to R output
Disc combined with «M, M» : L+R to L and R output, full mono
Disc combined with Stereo and «M : L to both outputs
Disc combined with Stereo and M» : R to both outputs
Disc combined with Stereo and «M, M» : L+R to both outputs, full mono
Radio1This
is a special situation because the Quad FM2 and FM3 tuners carry the
mono signal on pin 1 of the Din connector. So if a device is connected,
without a signal on pin 1, there will be no output in the first three
situations described below!
Radio1 combined with «M : Signal pin 1 to L output
Radio1 combined with M» : Signal pin 1 to R output
Radio1 combined with «M, M» : Signal pin 1 to L and R output, full mono
Radio1 combined with Stereo and «M : L to both outputs
Radio1 combined with Stereo and M» : R to both outputs
Radio1 combined with Stereo and «M, M» : L+R to both outputs, full mono of pin 3 and 5
Radio2 and Tape replayRadio2 combined with «M : L to L output
Radio2 combined with M» : R to R output
Radio2 combined with «M, M» : L to L output, R to R output
Radio2 combined with Stereo and «M : L to both outputs
Radio2 combined with Stereo and M» : R to both outputs
Radio2 combined with Stereo and «M, M» : L+R to both outputs, full mono
On units below serial number 7500 there was no possibility to fed one channel, Left or Right, to both outputs.
Connecting a CD player to a 33 Control Unit.Quad advised in a previous factory document three ways to connect a CD player
A modified Disc Adapter board
Via Radio 1 or 2
Via the Tape input
From
a technical point of view the Tape input is the best option, the signal
from that input is fed through a resistive network on the tape adapter
board and than connected via the switch to the volume pot meter. Also
the input sensitivity can be set to 1V.
The second best solution
is the usage of one of the two radio inputs. The sensitivity of those
inputs is 100mV and the signal is fed trough the tape adapter board,
one transistor stage extra.
The worst option is the usage of the
modified Disc Adapter board. The signal is fed through an extra two
transistors, compared with the first option a total of three
transistors extra, and associated components. The only advantage is the
sensitivity setting can be adjusted by changing some components.
If
you want to use one of the radio inputs for a CD player, buy a special
cable with at least a 10dB attenuation, otherwise, in most cases the CD
player will be too loud with normal volume settings.
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De plejer at være flinke til at svare
De mono 303 jeg har set mangler vist en af de 3 store lytter ??
Prøv at se bag på det 4 polede din stik ? er det loddet sammen - hvor går ledingerne hen - i forhold til det diagram der blev postet her i en af dine andre quad tråde - +?
Hvorfor kører du ikke med 33 forforstærkeren ?
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for tiden afspiller jeg meget musik - det lyder godt