Statesman Series
Absolutely pay attention to preparations and chronological order!
1.Turn off the device
2.Exchange tubes
3.Remove all jumpers
4.In tubes with the same characteristic curve, do not change the position of the bias trimmer. In tubes with unknown characteristic curve, turn the bias trimmer to the
5.Turn on the device
6.Measure and adjust the bias current (equivalent voltage):
The jumpers bypass a shunt resistor. When removing the jumpers, the cathode current can be determined via the exposed pins through a voltage measurement. The following applies in this connection: 1 mV is equivalent to 1 mA. The order of the jumpers from left to right corresponds to the order of the appurtenant tubes from left to right. The bias current is correctly adjusted if a voltage between 16 and
21 mV is applied to the pins (between the upper and lower pin of the respective jumper) with all tubes. If this voltage range cannot be adjusted to all tubes, the divergent tubes must be exchanged and a suitable tube must be found. For this reason Hughes & Kettner offers selected tube sets with similar characteristic curves.
7.Turn off the device
8.Put on all jumpers. Attention: Do not forget to put the jumpers on again after successful alignment! Never operate the amp without jumpers!
9.Turn on the device
10.Carry out hum balance Basic setting: Switch the amp to CLEAN, turn VOLUME, TREBLE and MID to the
11.Mount the protective grid again
4. Possible Error
Sources / Troubleshooting
Mains connection: STATESMAN won’t power up when you switch it on.
•It‘s not getting AC power. Check the Mains cord to see if it is connected and firmly seated.
•The Mains fuse is defective. Ensure it is replaced with another fuse bearing the same rating.
•The local Mains voltage does not match Statesman’s operating voltage
Available Voltages and How to Adapt Them
Statesman ships in two versions rated for 110/120V and
indicates the currently selected voltage, and the inverted number indicates the alternative voltage. Check also the fuse ratings to ensure they match the ratings indicated on the rear panel.
Voltage selection and fuse replacement may be performed by experienced service technicians only. Accordingly, the following notes are addressed exclusively to service technicians:
•Use a small flat screwdriver to remove the voltage selector from the Mains socket.
•If the fuse is defective, replace it with a fuse bearing the specified rating.
•Turn the voltage selector and insert it back into the port so that the desired Mains voltage rating is legible and appears at the top left (next to the “Voltage Setting” arrow).
Statesman is connected properly, but no sound is audible.
•The guitar’s VOLUME knob is turned all the way down.
•The amp’s VOLUME knob is turned all the way down.
•The effects loop is active and set to SERIAL, but no effect device is connected.
•The anode fuse has blown. Ensure that it is replaced with a fuse of the same rating.
•The fuse for the tube heating tripped (the tubes don’t glow). Ensure that it is replaced with a fuse bearing the same rating.
The amp makes ringing noises when played and tends to Feedback.
•One or several tubes are microphonic. Replace the defective tube with another of the same type.
Signs of tube wear such as increased microphonics and noise, Treble loss, weak power output or muddy sound begin reappearing just a few hours after replacing tubes.
•The wrong tubes were installed when old tubes were replaced or the amp was not biased properly. Take the amp to a professional to correct the problem.
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