darTZeel Audio NHB-108 - Manual (Page 28)

darTZeel NHB-108 model one Audiophile's technical manual Page 28 of 28
Voltage values are those obtained in av-
erage conditions. It is possible that they
vary much less than mentioned, having
less DC drift from cool to warm opera-
tion. If so, you can adjust these values a
bit tighter.
Conversely, it could arise that you may
have to work closer to the critical
600mV, say +590mV at cold start,
and -590mV at warm cruise, for exam-
ple.
The final goal is only to maintain outputs
within the voltage range mentioned
above. It is not necessary to symmetri-
cally adjust between cold and hot values.
The measured output DC drift does fluc-
tuate very slowly around the set value.
This is a normal behavior and cannot be
interpreted as a failure.
If you are unable to find a tuning value
between cold and warm points, please
check that the ambient room tempera-
ture does not vary over too wide a
range. If this is the case, we strongly
recommend using the darTZeel NHB-108
model one version B.
12.2. Monitoring circuit
The monitoring circuit, also called super-
vision system, includes a trimmer for
clipping threshold adjustment. We do not
recommend altering the tuned value,
unless you happen to note that a mono
input signal will trig both eyes with more
than 0.8dB difference. Please feel free to
contact us in case of doubt.
On later machines, bearing a serial num-
ber different to TZ- UA 1081. xxxX , addi-
tional trimmers will be included on the
PCB.
Do not alter these trimmers! The war-
ranty could become totally void!
12.3. Version B
On the version B, it is possible to disable
the DC output drift compensation.
Likewise, if you only use XLR floating
balanced inputs, it is possible to install
jumpers in order to bypass the commu-
tating relays. This would help improve
the sound quality slightly.
At the time of writing, the additional cir-
cuit of the version B is not yet ready, so
we cannot describe this bypassing pro-
cedures in detail.
As soon as the optional version B circuit
becomes available, a new release of the
present manual will be printed and sent
to all darTZeel NHB-108 model one owners,
having either the A or B version.
12.4. Future developments
As and when further developments take
place, such as improvements, updates,
modifications, or simply some new ad-
vice, this chapter will be supplemented.
Thank you very much for having read us
through to the end!
Now you have earned a rest, a quiet
moment to listen to some nice music!