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173.48.1.103
In Reply to: RE: Mac C32 preamp posted by BillH on April 09, 2015 at 07:50:44
Looks to me like the main (front panel) volume control does not affect the monitor amp. The attached is a screen shot from the C32 service manual.
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The Mind has No Firewall~ U.S. Army War College.
Honestly, I was surprised when I looked at the schematic - I expected the monitor amp to be controlled by the main volume control, too. This is probably one of the changes made between the C32 and C33.
I don't own a C32 (I have a C30, with no monitor amp), so I can't say from personal experience, but the C32 owner's manual also says this:
MONITOR AMPLIFIER
Although its primary purpose is to drive the headphone
jacks, the MONITOR AMPLIFIER may additionally be used:
1. To listen, on speakers, to any of the inputs connected to
the C 32 without the use of a separate stereo power
amplifier. Stereo loudspeakers can be connected to the
rear panel 8 ohm terminals. The program source for the
MONITOR AMPLIFIER may be selected from either the
LISTEN program line or the RECORD program line by
means of the top panel INPUT switch. Beside the INPUT
switch are LEFT GAIN and RIGHT GAIN controls. They
control the volume of the respective channels of the
MONITOR AMPLIFIER.
2. To drive a 600 ohm unbalanced line connected to
OUTPUT LINE jacks.
3. The extensive flexibility of the C 32 permits many other
possible uses of the MONITOR AMPLIFIER such as
adding a reverberation device, time delay or "ambience"
accessory unit, discrete 4-channel, etc.
Here's the whole schematic, pieced together from the service manual. (Sorry if it comes out large on the screen.)
Note even the headphone jacks are not controlled by the front panel volume control.
Looks like I misread my own schematic - the monitor amp has an input switch that appears to select between a direct feed from the inputs and a feed that comes through the rest of the preamp, *including* the front panel volume control.
So I believe the answer to the original questions is "yes, the front panel volume control can be used to control the outputs of the monitor amp."
Which from a user's perspective is the only thing that would make sense.
Big help. Thanks, Jon.
Thanks. Even I can read that.
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