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ground and is there to protect you if there is a fault that could energize the
chassis of the component and cause electrocution.
Maintenance of your amplifier
Tube equipment requires periodic maintenance to ensure optimum performance.
Cleaning
– Keep the tubes clean and free of dust and oily deposits. Remove and
clean with a soft towel and a mild solvent if necessary (every couple of years). Be
careful not to spill the solvent on the painted surface of the casework! The
casework can be cleaned with a mild detergent and soft towel. In both instances,
apply the liquid to the towel, not directly to the amplifier! Always clean when the
preamp is
off
and has
cooled down
. The added benefit of this is that by removing
and re-inserting the tubes you are cleaning oxidat
ion off of the tubes’ pins and
the socket.
Be sure to swap their positions when re-installing; V1 for V2 & V3 for V4; this
reverses the polarity on the filaments to prolong tube life. You may also want to
blow out the dust with compressed air while you’re in there.
Heat
– Your preamp will create heat, that’s the nature of tubes. Keep it well
ventilated and away from other heat sources
Vacuum tube replacement:
With power off for more than 5 minutes,
disconnect from the power supply and
remove the top cover of the preamp. Refer to figure 2 for tube locations- the
phono input tubes (V1 & V2) are 12au7a’s and have a removable aluminum
shield.
The linestage tubes (V3 & V4) are ECC99’s. Be careful when handling
tubes, they are fragile. Carefully remove tubes from their sockets and replace
with new ones, observing the pin-orientation; they can only go in one way
– do
not force them!
Make sure the tubes are clean and replace the top cover. Hook up to the power
supply as described above and enjoy. New tubes will need to break in a bit and
will sound better progressively over the next 10 hours or so of music playback.
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