5
Cool air is drawn from under the chassis by the heat from the tubes acting as an air
pump, and exhausting the warm air out the chassis through the vents.
Place the amp on a hard surface. Do not place the amplifier on a carpet without some-
thing hard for it to sit on like a piece of nice glass cut to the same size as the unit. This will allow
Placement and Cooling
Inserting the Vacuum Tubes
The RAM 285 comes with five small
and four large vacuum tubes: Two 6AL5, Two
12AT7’s, one 12AX7, and four KT-120 output
tubes. The tubes come installed in your
RAM285.
To change tubes, press the tubes into
the bases (sockets) gently so that you don’t
bend the pins. Note the missing pin on each of
the small tubes and its alignment with the
missing hole in each socket. A very slight wig-
gle while inserting the tube will help to engage
the socket.
The bases for all five small tubes are
identical, so take care to make sure that the
12AX7 is in the middle socket.
KT120 Tung-Sol in their infinite wisdom
has configured their tubes black, central base
hole to be slightly different than our conven-
tional tube bases. Look carefully so that the
“key”, the raised portion of the tube’s central
base, is aligned with the “key way” on the tube
socket. If you rotate the tube gently you will
feel the tube drop-in when the key and keyway
align.
the feet to do their job by keeping the bot-
tom raised, allowing unimpeded airflow.
A glass shop can make such a base
plate and in colors if you wish. A nice dark
gray, smoke or opaque black looks beauti-
ful. It should be at least a half inch thick.
We also don’t recommend placing
the RAM 285 in a tightly-enclosed
cabinet without sufficient ventilation. Allow at least 15 inches of free space above the
amplifier
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