8
•
securely and correctly fastened the speaker cables and ensured that they are also connected properly
to the speakers
•
checked that all tubes are snug in their sockets
Turn on the A-5000 DHT by depressing the power switch button located (facing the front of the unit) on
the right side-panel to the “on” position. The “on” position is with the top of the button switch depressed.
Of course, the off position is the reverse. After about a thirty to forty (30 - 40) second delay (the soft
start), the A-5000 DHT will be powered on. After warm-up and application of full plate voltage, not all
tubes may bias at the same rate. Allow one or two minutes for all the tubes to reach full operating
specification.
OPERATION
When the power is on, the current meter on the front of the chassis will illuminate (See Figure 5). From
this point on, operation is straight-forward. When you are finished listening, turn off your A-5000 DHT
monoblocks first; then, turn off your preamplifier and sources.
In the case of any failure, please contact Your Allnic dealer for assistance.
THE CURRENT METERS
The single, illuminated meter indicates the current supply to the 300B power tube in the A-5000 DHT (See
Figure 5). There is also a screw type potentiometer on the chassis top directly in front of the 300B (Refer to
Figure 6 for its location).
When you turn on the A-5000 DHT, the needle of the current meter should be between the two parallel
lines on the meter face. Any error of current supply to or failure of a 300B tube is indicated by the needle
moving out from between these two parallel lines.
TUBES AND TUBE BIAS
Each A-5000 DHT monoblock uses the following tubes (See Figure 6):
•
One (1) x 300B
•
One (1) x RS242
•
One (1) x New Old Stock HL-2
•
One (1) x 5U4G (Substitute with equivalent direct-heated rectifiers only)
Because of the user adjustable bias for the 300B, it is not necessary to use a matched pair of these power
tubes in the A-5000 DHTs.
The illuminated meter on the front of the chassis (see Figure 5) indicates the current supply to the 300B tube
in the A-5000 DHT. There is a potentiometer that is used to bias the 300B (Refer to Figure 6 for its location).
