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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 qto check off your progress.
FBefore starting to build, read also the general guidelines
