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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.
F
Before starting to build, read also the general guidelines
