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RESONANCE
This feature is used to fine-tune the low-frequency response and damping factor of the power amp
section. At higher settings, the speakers are allowed to move more freely at low frequencies, resulting in
more apparent low end response.
PRESENCE
This control is used to fine-tune the high-frequency response and damping factor of the power amp
section. At higher settings, the speakers are allowed to move more freely at high frequencies, resulting in
more apparent high end response.
OUTPUT TUBE STATUS INDICATION (T.S.I.™) LEDS
These are LEDs that light green or red depending on the status of the output tube they are monitoring.
These are merely the visual part of the wider status indication, fault detection and tube protection circuits.
The LEDs T1 and T2 relate to the EL84 power tubes from left to right (when viewed from the front).
The simple explanation of this circuit is that the LED will be green in normal working mode and red in any
other mode, including: Standby, low bias, low current (tube wearing out) or high current fault condition
that has activated in the tube protection circuit.
The more complete explanation is as follows:-
On Standby, the LEDs should be red. This is due to the tubes not yet being fully on.
When switching from STANDBY to ON, these should then turn from red to green.
The LEDs will remain green, under normal operating conditions.
If an LED goes red then it means that the output tube is not working properly for one of the following
reasons:
- Tube is ‘under current’: This could be due to incorrect bias, low current due to aging, open circuit due to
structural/physical fault or missing filament heater supply.
- Tube has gone ‘over current’: In this case the resettable protection circuit will be switched in to protect
against further damage and to allow the amplifier to carry on working with the remaining tube. This could
be due to bias failure, over-heating of the tube or other fault condition resulting in excessive current draw.
Reset: Under certain conditions (e. g. during an adequate pause in playing), the protection circuit will
auto-reset and allow the tube to be turned back on. If the fault remains then the LED will stay red. In these
situations, at a convenient point, the amp should be turned off for a few minutes then back on again. If
the fault is still there, then the amp should be checked by a qualified and competent technician for correct
output tube bias or faulty tube(s).
STANDBY switch
Placing this switch in the“STANDBY”position will effectively shut the amp off while leaving the tube
filaments on. Leave this switch in the“STANDBY”position for a minimum of one (1) minute after engaging
the POWER switch (#14). This is also a useful feature, since much tube wear comes from the heating and
cooling of the tube itself. Leaving the unit in“STANDBY”when you take a break allows the tubes to stay
warm while you are not playing. To immediately resume normal amp operation with no warm-up delay,
place the switch in the“ON”position. NOTE: This switch does not replace the POWER switch (#14). When you
are ready to stop playing for an extended period of time*, it is better to turn the amp off via the POWER
switch (#14). To prevent any undesirable noise, it is recommended to switch the amp to “STANDBY” for at
least a few seconds before switching fully off.
* Excessive time off (more than one hour) in "STANDBY MODE" can damage OUTPUT TUBE by "poisoning
the cathodes".
* For an informative description of the STANDBY function, please read the Chapter 6 (Standby...For the
Truth) of Hartley Peavey's White Papers included on this disc.
6505 MH
®
Front Panel cont.
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