Midi - Hughes & Kettner Grand Meister Deluxe 40 Handbuch

One LED flashes, another lights up continuously
The tube assigned to the flashing LED is generating too much current and
therefore has been shut down. This tube has to be replaced. In this type of
power amp, it takes a pair of tubes working together to produce the best
sound. Therefore TSC™ also switches the defective tube's counterpart off
(indicated by the continuously lighting up LED), so it doesn't degrade the
other pair's tone. There is no need to replace this tube, because there's
nothing wrong with it.
Now this is where TSC™'s intelligence saves your gig: if a tube failure
like this occurs in a conventional amp, its fuse usually trips and you can't
operate it until you replace the tube and fuse. Thanks to TSC™, you can
continue playing for as long as the LED remains illuminated. However,
please note that shutting down one pair of tubes will halve the amp's
output power from 40 to 20 watts. And don't forget to replace the defective
tube after your show.
7.2 Manual Read-Out
TSC™ is able to check the power amp tubes' bias points
to let you determine if tube pairs are matching. This can
easily be done by inserting a guitar pick into the slot right
next to the LEDs while the amp is switched on (rather than
in Standby mode). All LEDs will flash several times. The
number of flashes of every single LED will give you information about the
Hughes & Kettner tube rating of the assigned tube as well as about its bias.
The tube ratings table below (7.3) shows the Hughes & Kettner tube ratings
and how flash counts translate to a rating. For example, if the TSC™ LED
flashes six times, the assigned tube has an S2 rating. The chart also tells you
that the tube's bias point is set to 13 volts.
Please make sure that the difference in flash counts between the single LED
is no greater than four flashes. Only if the difference is no greater than four
flashes, will TSC™ ensure optimum sound. If the difference in flash counts
is greater than four, we recommend installing a matched set of tubes to
improve the tone. This is strictly a matter of tone – technically speaking,
the amp will continue to operate safely.
Heads Up: The two inside tubes and the two outside are matched pairs.
If just a single tube is swapped, ensure the replacement tube's rating
matches that of its counterpart. If all tubes are replaced, ensure they all
share the same ratings. You can buy replacement tubes from your local
dealer. The original Hughes & Kettner rating (S1-S7, 0-12) is shown on a
sticker on the tube itself.
7.3 Tube ratings tables
Flashes Rating
1 S7
2 S6
3 S5
4 S4
5 S3
6 S2
7 S1
8 0
9 1
10 2
11 3
12 4
13 5
14 6
15 7
16 8
17 9
18 10
19 11
20 12
21 *
22 *
23 *
24 *
25 *

8 MIDI

As you've learned in chapter 2.2, presets can only be changed via MIDI.
Sender (controller) and receiver (amp) must use the same channel. The
factory default is MIDI channel 1 and "Omni On". If the amp does not
react to program changes properly, the MIDI channel has to be changed.
8.1 Setting MIDI channels and switching
Omni On/Off
Flip the Play/Standby switch to Standby. Now press and hold Noise Gate
and FX Loop simultaneously for three seconds. The Store button will light
up. This assigns special programming functions to the following LEDs and
buttons:
• FX-Access: lights up to indicate GrandMeister Deluxe 40 is configured
to receive incoming program changes via all MIDI channels (Omni On,
default). If the LED is not illuminated, the amp receives messages via the
selected channel only (Omni Off). To change the Omni mode, just press
the FX Access button.
• Noise Gate now serves as a +1/up button, FX Loop now serves as a -1/
down button. Use these buttons to change the MIDI channel.
• When configuring MIDI channels, the four Channel LEDs serve to
indicate the MIDI channels. Consult the table below for the MIDI channel
assignments. They show what in tech-speak is called binary code:
GrandMeister Deluxe 40 – Manual 1.1
Bias [V]
10
10.6
11.2
11.8
12.4
13
13.6
14.2
14.8
15.4
16
16.6
17.2
17.8
18.4
19
19.6
20.2
20.8
21.4
22
22.6
23.2
23.8
24.4
11