AMERITRON AL-811HY Manual - Página 4

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METERING FUNCTIONS

The AL-811H has two illuminated panel meters. The right

meter reads PA grid current up to 200mA. The normal current

with a single tone (carrier) signal will be 150mA to 175mA. If

the current is too high during full power operation, the loading

control should be advanced to a higher setting.

LOCATION

Do not operate the amplifier in excessively warm locations or

near heating vents or radiators. Be sure air can circulate freely

around and through the amplifier cabinet.

unobstructed air inlet for the blower. Do NOT place any books,

magazines or equipment that will impede the free flow of air

near the sides of the cabinet.

VENTILATION

The AL-811H ventilation system has been designed and tested

to maintain the 811A tube temperature safely below the tube

manufacturer's rating at 500 watts output with a 100% duty

cycle. To insure proper ventilation in your installation, observe

the following:

Do not block or restrict the ventilation holes in the cover.

The exhaust air flow is over 20 CFM. Do not "assist" the

air flow unless the fan exceeds the AL-811H fan CFM by a

factor of 2:1.

Do not mount additional fans on the AL-811H cabinet.

The exhaust air will become warm at high power levels. Do

not place any heat sensitive objects in the exhaust air

stream.

GROUNDING

Connect a good earth or water pipe ground to the ground post on

the rear panel of the amplifier. Use the heaviest and shortest

connection possible.

Before you use a water pipe ground, inspect the connections

around the water meter and make sure that no plastic or rubber

hose connections are used.

electrical continuity to the water supply line. Install a jumper

around any insulating water connections you may find. Use

heavy copper wire and pipe clamps. It is best to ground all

equipment to one point at the operating position and then ground

this point as described above.

POWER CONNECTIONS

The AL-811H is supplied with a NEMA 5-15P plug for 120V

operation. The power required to operate the AL-811H/HY is

not high enough to warrant 240V operation unless 120V is not

available. The fuses should be 12 ampere fuses for 120V and

they must be changed to 8 amperes for 240V operation. The

diagram to the right shows the proper wiring for 120V

operation.

Operation on a voltage of 240V is not required, nor will it

necessarily improve performance. The power transformer will

INSTALLATION

Provide an

These connections interrupt

If the current is too low, the loading control should be turned to

a lower setting. The left meter reads PA high voltage up to 2000

volts and plate current up to 750mA. The normal readings are

1400-1600 volts HV and 650mA of current at full rated output

with a single tone signal.

perform equally well with a power line frequency of 50 Hz or 60

Hz. The Transformer Connections chart at the bottom of this

page shows proper connections for various line voltages.

WARNING: The green wire connects to the chassis of the

amplifier and it must connect to the safety

ground of the outlet.

The AL-811HX (export model) is wired for 240V, 50/60 Hz

operation. The appropriate plug is not provided for this model.

You must wire the proper plug on the end of the power cord

supplied.

Simply cut the existing plug off and wire the

appropriate plug in its place. If the line voltage in your country

is not 240V, then you must change the transformer to the

appropriate setting indicated by the chart below. Note: the AL-

811H transformer allows operation on 100V line voltage in

countries such as Japan.

NEVER REWIRE THE POWER SUPPLY TO BOOST THE

HIGH VOLTAGE ABOVE 1800 VOLTS. ALSO, DO NOT

ATTEMPT TO REWIRE THIS AMPLIFIER WHILE IT IS

CONNECTED TO POWER.

The wiring between the fuse box and the amplifier AC outlet

must be 14 gauge or larger in order to supply the operating

current required (10 amperes) without a significant drop in the

line voltage. The outlet should be fused for the wire gauge used.

*Factory wired operation for the AL-811H

** Factory wired operation for the AL-811HX

VOLTAGE

BUCK BOOST

* 120

A to 1, B TO 2

110

1 to 2, (A,B OPEN)

100

A to 2, B to 1

For 240, 230, 220 all three primary conditions apply ↓

** 240

A to 1, B to 2

230

1 to 2, (A,B OPEN)

220

A to 2, B to 1

PRIMARY

C to D, E to F

no connection C to D

D to E

no connection E to F