Air
Tight ATM 211
Modifications
The
Air Tight 211 mono's are equipped with a volume control at the front, and although
this is convenient
to cope with varying situations, when using a matching preamplifier one volumepot
is enough.
The
modification itself is quite simple, and the stock wiring harness was left in
place with some crimpsleeve to cover the ends. The stock wiring may be seen in
the first picture laying bottom left hand side. We had some fine Kondo KSL Silver
wire available, these are to be seen in the picture with the black crimpsleeve
at the wire ends.
Firstly
we'd like to state that it is unwise to
modify such a splendid circuit design just
because it can be done. The people
at Air Tight know what they do, and they
do it for quite some time now to put an
understatement. This modification does not
alter the circuit, it bypasses the volume
pot and inserts some refined components
in place of stock ones. Much more expensive
components will not necessarily sound better
just because.
Mind
it is not our hobby to mod gears, the following
job is exemplary.
Still
this modification brought an subjectively
small gain soundwise. We presume that the
removal of the volume pot accounts for the
most. Parts involved were the Jupiter Copperfoil
0,47uF capacitor, the Amtrans 220R, and
a Riken resistor (the blue collar one next
to the Jupiter) A
nice and succesful modification, which is
retrofittable too. If 22 Watt is enough
the ATM211 is highly recommended.
This
could not have been done without the knowledge
and parts of Acoustic-Dimension
thanks again!
