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A FEW WORDS CONCERNING HEATA FEW WORDS CONCERNING HEAT
One of the most asked questions about our amplifiers is why they tend to get warmer than other amps. The chassis of your
amplifier can get quite warm during normal usage. This is especially true if you are are driving the amplifier at its minimum
impedance. This is because a 2.6 ohm impedance introduces
the least efficient condition possible for the unit (ie: power drawn from the outlet in relation to power
produced in the speakers). The difference in these two figures can be quite high,
Furthermore, most musical instrument amplifiers on the market today use steel for their chassis', which in most cases is consid-
erably cheaper than aluminum and does not conduct heat as well. The Power 750 utilizes an aluminum chassis (with the excep-
tion of the chromed front panel) which is a better
conductor of heat. This results in the chassis acting as a heatsink - drawing heat away from internal heat-producing components,
thus extending their life. In this manner we feel we have produced a more reliable amplifier, however, at the same time, the
chassis of the Power 750 will get warmer than a similar amp chassis that is made of steel.
The one condition you should be aware of is if the power amplifier in your unit becomes "over-biased." This condition can be rec-
ognized by turning your amplifier on and letting it sit "idle" (without speakers plugged in and without playing it). If your unit starts
getting hot under these conditions, it may be
over-biased. This situation should be attended to and can be easily remedied in about 15 minutes by a qualified service techni-
cian. A power amp can become over-biased through continuous vibration or by any large jolt received in shipping, etc.
RACK MOUNTING INSTRUCTIONSRACK MOUNTING INSTRUCTIONS
To preserve the beauty and reliability of your amplifier, we recommend that you install your amplifier in a rack case. The Power
750 is completely ready to be rack mounted and needs no additional parts or accessories other than the rack screws and the
case itself.
The Power 750 takes up three full rack spaces (5"). If the rack in which you mount the Power 750 requires that the rubber feet
on the bottom of the chassis be removed, please remember to keep the screws handy in case you wish to reattach the rubber
feet at a later date.
The Power 750 should be mounted as close to the bottom of the rack case as possible. If you must mount the Power 750 in an
area of the rack other than the bottom space, a piece of wood or similar solid material should be installed between the bottom
of the rack case and the bottom of the amplifier to prevent flexing of the amplifier's chassis. Severe or constant flexing of the
chassis can damage the amplifier and is not covered under warranty.
Don’t forget about your amplifier after it has been installed in a rack case! Continuous transportation and vibration can cause
screws to become loose, both on the Power 750 and with your rack case rails. We recommend that at least once a month you
remove the Power 750 from the case and tighten all outside screws (especially the rear mounted screws holding on the front
panel) and wipe off the outside of the chassis with a damp cloth (to help keep that chrome nice and shiny!). Then check all the
connections in your rack case and reinstall the unit.
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