Hi All,
I would like to remove the balance pot in my Cyrus 2 amplifier, it is a 100K potentiometer as can be seen (marked in red) in the atached drawing.
The preamp section is passive, there is only volume and balance potentiometers before the power amp stage (the phono stage is active but I'm not using it).
I would like to know please if it's better to install 2 50K resistors to replace the balance pot or would it be better to leave it without connecting any resistors?
How it will affect the signal going to the power amp stage (with 50K resistors and without)?
I also would like to know the purpose of the 150pF capacitor(marked in blue) ?
Thanks
I would like to remove the balance pot in my Cyrus 2 amplifier, it is a 100K potentiometer as can be seen (marked in red) in the atached drawing.
The preamp section is passive, there is only volume and balance potentiometers before the power amp stage (the phono stage is active but I'm not using it).
I would like to know please if it's better to install 2 50K resistors to replace the balance pot or would it be better to leave it without connecting any resistors?
How it will affect the signal going to the power amp stage (with 50K resistors and without)?
I also would like to know the purpose of the 150pF capacitor(marked in blue) ?
Thanks
Attachments
I have never liked any type of audio balance that in any way interconnects both channels signals of an audio amplifier .
I would rather use other methods of balance but each to his own.
Personally I would disconnect the balance control but some like the convenience of its action.
I would rather use other methods of balance but each to his own.
Personally I would disconnect the balance control but some like the convenience of its action.
The simplest way is to just remove the 3.6k resistors that are in series with it to either channel, but leave the pot
and wiper connection in place. (At any time the function can be restored by reinstalling the resistors.)
The remaining pot will have no effect on the operation. The 150pF is a noise filter, set at around 200kHz.
Thank you.
In the Cyrus 2 the volume and balnce pots are combined, I removed the volume and balance pots and replaced it with Alps blue potentiometer, I don't have any use for the balance control but was wondering if by removing the balance pot there will be any effect on the signal level as the 100K pot (or 2 50K to be correct) is no longer part of the circuit and signal path.
In the Cyrus 2 the volume and balnce pots are combined, I removed the volume and balance pots and replaced it with Alps blue potentiometer, I don't have any use for the balance control but was wondering if by removing the balance pot there will be any effect on the signal level as the 100K pot (or 2 50K to be correct) is no longer part of the circuit and signal path.
There will be a slight increase in gain without the balance control connected,
since the signal is then attenuated less.
In fact you could consider replacing R45 (4.7k) with a smaller value, say 1k or 470R,
to further reduce the 3dB loss in that circuit. There's no reason for the capacitor other than the
noise filter, but the noise capacitor can either be removed, or replaced with a larger one (1nF),
if you want to retain the HF filter (I would remove it).
since the signal is then attenuated less.
In fact you could consider replacing R45 (4.7k) with a smaller value, say 1k or 470R,
to further reduce the 3dB loss in that circuit. There's no reason for the capacitor other than the
noise filter, but the noise capacitor can either be removed, or replaced with a larger one (1nF),
if you want to retain the HF filter (I would remove it).
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> Wouldn't it overload the power amp input?
Don't you still have a Volume control? Can you turn it down if the amplifier overloads?
Don't you still have a Volume control? Can you turn it down if the amplifier overloads?