7
THE CURRENT METERS
The two illuminated meters indicate the current supplies to the four EL34 power tubes in the T-1800. Between and
to the outside of each channel pair of EL34s is a small toggle switch. Pushing the toggle toward the rear of the
chassis allows you to read and use the meter to evaluate the current condition of the rear EL34; pushing the toggle
toward the front switches the meter to the front EL34. You can use the toggle during operation. See Figure 5.
When you turn on the T-1800, the needle of the current meter for each EL34 should be between the two parallel
lines on the meter face. Any error of current supply to or failure of an EL34 tube is indicated by the needle on the
meter moving out from between these two parallel lines.
If a meter’s needle drops below the left parallel line during operation, it indicates a failure of the related EL34 tube.
You must turn off the T-1800 and replace the EL34. Check the meter for the other EL34 on that channel. If the meter
needle is between the parallel lines, it is not necessary to replace that tube.
If you have any questions about doing this, please contact Hammertone Audio for assistance.
TUBES
The T-1800 uses the following tubes:
•
Two (2) x EL34
•
Two (2) x E180CC
•
One (1) x 12AY7
Because of the automatic bias for each EL34, it is recommended to use closely matched pairs of EL34 tubes in the
T-1800. Please refer to Figure 5 for tube locations.
You may use any EL34 type tube in the T-1800. However, as with all tube equipment, changing tubes from one
manufacturer’s to another’s may alter the sonic characteristics of the equipment. It is NOT recommended to
substitute the EL34s with power tubes commonly considered similar to them.
All consequences of changing or attempting to change tubes are borne by the user unless by express agreement
between the owner and Hammertone Audio. Allnic Audio and Hammertone Audio are not liable in any way
whatsoever for any injury or loss incurred by the user or for damage to the T-1800, any of its parts, or tubes or
replacement tubes resulting from the user changing or attempting to change tubes.
SPECIFICATIONS FOR THE ALLNIC AUDIO T-1800 EL34 STEREO INTEGRATED AMPLIFIER
Output Power:
40w + 40w (8 Ω load, at 1KHz)
Distortion:
0.1% at 1KHz, 2.83V/8 ohms
Frequency Response:
20Hz - 20KHz Flat
S/N Ratio:
-80dB (CCIR, 1KHz)
Damping Factor:
8 at 8Ω load at 1KHz
(on-off method)
Voltage gain:
+38dB
Input Impedance:
10KΩ (single
-ended, unbalanced)
Input Sensitivity:
400mV for rated power
Tubes:
•
EL34 X 4 (power triode) Substitution is not
recommended.
•
E180CC X 2 (2
nd
stage driver tube: similar to 5965 and
7062 – superior to 12AT7 in this application)
