Audio Valve RKV - Mark II, Manual, Page: 7 / 14

RKV – MARK II RKV – MARK II _________________________dynamic headphone amplifier____________ _________________________dynamic headphone amplifier____________
The black jack at the upper left of the backside is the IEC power inlet. Inside the power inlet a
fuse can be found as a protection against overload.
For the 117 V version the value of the fuse should be 1 Ampere Slow.
For the 235 V version the fuse is 0,63 Ampere Slow.
Please only change the fuse with the powercord disconnected and if you're sure that the amplifier
is not defective!
Below the power inlet you find two pairs of RCA-inputs to connect the source of your audio signal.
The two pairs of inputs are connected in parallel. Thus you can bypass the input signal to another
amplification or recording device. Please use either the lower or the upper pair of RCA-inputs to
connect your source.
Whenever the device is to be serviced, please disconnect the powercord. Only a knowledgable
technician should have access to the amplifier.
This survey of the PCB's will explain the most important elements for service.
The four tubes are all equal and of the type PCL 805. Thereby the amplifier is relatively secure
from overload. The two tubes at the left side belong to the same audio channel.
To be mentioned are 4 fuses for the two mono channels. The 0.5 Ampere fuses are for the anodal
current regulation and the large 3,15 Ampere versions protect the heating circuitries. Normally,
these fuses will hardly fail, as the inrush current at power ON is reduced to acceptable levels by a
guarding circuitry. In case a fuse is to be exchanged, please make sure you use the same value
and not a higher one.
If you want to exchange tubes, please disconnect the power cord. Also make sure that all pins are
properly mounted into the sockets. It is not uncommon that a pin is bend and doesn't enter the
socket.