Velleman K4040 - Technical Data and Specifications; Tools and Procedures

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4
STEREO VALVE AMPLIFIER
TECHNICAL DATA*
• Output power:
2 X 0 to 15 Wrms class A
2 x 15 to 90 Wrms class AB
• Output impedance 4 or 8 Ohms
• Ultra linear output transformers
• Switch-on delay, to protect the output tubes: approx. 1 minute
• Standby circuit
• Built-in bias current indicator
• Switch-on delay for the supply transformer: 0.5s
• Power bandwidth: 15 - 40kHz (-3dB, ref 50W)
• Frequency range: 8 Hz - 80kHz (-3dB, ref 1W)
• Harmonic distortion:
0.1% (1 kHz/1W)
0.7% (1 kHz/90W)
• Signal/noise ratio: > 105dB (A weighted wrt 90W)
• Channel isolation (75dB wrt 90W)
• Input impedance: 34Kohm
• Input sensitivity (1Vrms) for 90W
• Damping factor (100Hz): > 10
*We reserve the right to make changes.
ASSEMBLY STEPS
Required tools to assemble the kit:
Use a small soldering iron of max. 40W.
Use thin (1mm) solder, do not use any flux.
Use a small cutter to trim the excess wires.
1.
2.
3.
4.
Mount the components
against the PCB surface
and carefully solder the
leads in place.
Obtain cone- shaped, shiny
soldered joints by heating
the component leads suffi-
ciently.
This solder joint re-
sults in a bad con-
nection.
Trim the excess
wires up to the level
of the solder
• Careless assembly will certainly lead to problems.
• Insert the part, oriented correctly, into its correct holes on the PCB.
• Mount the components in the correct order as stated in this manual.
• The component values in the circuit diagram are for reference only. The values in this parts list are
correct and must be followed.
• Use the boxes q to check off your progress.
FBefore starting to build, read also the general guidelines