This unit was originally intended for use with our analogue tape
recorders, which means that the optimum operating levels are
around that of +4dBu – and at this point you still have some 14dB
up to the point where the tube side of the unit starts to get
tired, which happens around 15Vpp AC output – and then some before
it starts sounding bad. This means, however, that you should
consider checking your levels if you’re running a modern-day DAW,
which often comes factory set to extremely-high levels like +24 or
+28 for 0dBfsd. Those kinds of levels are aimed at keeping a good
safety-margin before running into digital-clip, but at the same
time it’s common practice to try getting as close to clip as
possible for loudnesswarrific reasons. A good level for use with
the G23-S (and for most analogue gear in general) is somewhere
10dBu to +15dBu analogue for 0dBfsd (full scale digital).
Note, that the solid-state path of the unit does not really care
much about working levels – but listening tests indicate that even
this sounds best at levels discussed above.
Our audio path, in “real mode”, consists of ONLY transformers,
tubes, and passive components. The power supply circuits, and off
course the solid-state audio chain when selected, are solid-state
based though.
The tubes should last for at least a couple of years - and often
much longer than that. If and when changing tubes, contact Gyraf
Audio for instructions on matching and proper adjustment of the
unit.
Important notice:
Do not open this unit, as there are really high - potentially
lethal - voltages present inside. Refer servicing to qualified
personnel. If trimming the unit, it is of primary importance to
use insulated tools, as lethal voltages are present on exposed
surfaces related to the trimming procedure. Do NOT try this
yourself, unless you’re absolutely sure what you’re doing.
You can safely remove the four rubber feet if you wish to mount
this unit in a tight rack - please save the feet AND screws for
future use, do NOT use longer screws than the supplied M3x5. NOTE:
The feet are the ONLY part that can safely be removed. Do not
loosen any other screws!
For long tube life, switch off unit when not in use. Don’t leave
it on all the time - it won’t suffer from being turned on and off
regularly.
This unit operates from 220-230V AC, consumes about 35W, and the
mains fuse is a 630mA slow-blow type. For the US-version, marked
“CE 115VAC”, the operating voltage is 110-120VAC, and the fuse is
a 630mA Slow-blow (“T”) type.
For further questions, comments and wishes, please contact Gyraf
Audio:
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