9 Crunch Volume-2
IMPORTANT, PLEASE NOTE: do not flip the Stand By switch off and on in short time
intervals if a P.T.M. LED (10, 11, 12, 13) indicates a tube failure. Let a few minutes
pass by before you engage the poweramp again after you have switched it off!
(Channel 2)
10 Power Tube Monitor V1
11PowerTubeMonitorV2
12PowerTubeMonitorV3
13PowerTubeMonitorV4
AnimportantnoteonthePowerTubeMonitor(P.T.M.)system:
Determines the level of Channel 2 (Crunch mode). Twist this knob to adjust Channel 2's
volume and dial in the desired balance of levels with Channel 1, 3 and 4. Because this
volume control is located pre effects loop, it also determines the effects send level for
Channel 2. The yellow LED to the right of the knob lights up to indicate Channel 2 is on.
This LED lights up when the current flowing through the V1 power amp tube was too
high and the power tube monitor system has switched that tube off.
To learn more about this crucial protection feature, read the paragraph that follows
section 13. See the tube layout chart on page 22 to locate V1's position on the amp
chassis.
This LED lights up when the current flowing through the V2 power amp tube was too
high and the power tube monitor system has switched that tube off.
To learn more about this crucial protection feature, read the paragraph that follows
section 13. See the tube layout chart on page 22 to locate V2's position on the amp
chassis.
This LED lights up when the current flowing through the V3 power amp tube was too
high and the power tube monitor system has switched that tube off.
To learn more about this crucial protection feature, read the paragraph that follows
section 13. See the tube layout chart on page 22 to locate V3's position on the amp
chassis.
This LED lights up when the current flowing through the V4 power amp tube was too
high and the power tube monitor system has switched that tube off.
The next paragraph provides details on this crucial protection feature. See the tube
layout chart on page 22 to locate V4's position on the amp chassis.
The electronic power amp monitoring system constantly gauges the current flowing
through each power amp tube. If it rises to too high a level the system shuts down the
given tube.
This can occur when the amp is operated incorrectly (for example, if the impedance is
wrong due to an incorrect speaker load; see page 17 for permissible loads), at extreme
power spikes, or when a tube is defective.
Reset this electronic monitoring system by switching the standby switch off and on
again. When you press the standby switch to turn the amp on again, the system again
measures the current sent to the tube. If it is still too high, the power amp must be
checked by a service technician, and the tube may have to be replaced if it is defective.
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