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PO BOX 7231, COLORADO SPRINGS, COLORADO 80933 USA E-mAIL: jRDG@jEffROwLAND.COm www.jEffROwLAND.COm TELEPHONE (719) 473-1181
All JRDG products are designed to provide
a lifetime of enjoyment
and listening pleasure. The Model 312 Stereo
Amplifier is uniquely
constructed from precision-machined 6061-T6 aluminum sub-
assem-
blies, configured and dimensioned to maximize chassis strength and
reduce vibration. Constrained mode damping materials have also
been applied in several areas to further reduce chassis resonance.
The chassis is sealed to prevent dust from
entering the interior and
should never need interior cleaning during the lifetime of the product.
All internal circuitry is maintenance-free such that no adjustments of
any kind are necessary over the lifetime of the product. If the amplifier
is ever in need of service, updating, or upgrading, it should only be
returned to an authorized repair facility or technician for servicing.
The front panel of the unit is precision-machined in a unique process
that incorporates a diamond tipped cutting tool. This process was refined
over many years to produce an attractive and unique appearance.
Because the surface is not finished in the typical fashion of most
audio and video equipment, there are a few rules that must be kept
in mind when cleaning the equipment.
• Please allow the front panel, which is coated with an automotive-grade polyure-
thane nish, to cure for 6 months before attempting to clean it.
This will prevent
small scratches from marring the surface before the surface coating has had a
chance to harden completely.
• The front panel of the unit should never be cleaned with anything other than a very
soft cotton cloth and plain water or ne oil-based furniture polish. Because of the
ne nish of the front panel, use of any other cleaning agent may permanently
scratch the nish.
• The top cover, sides and bottom are protected by a durable black anodized nish
and can be cleaned with a soft cotton cloth (such as an optical lens cleaning cloth
or ne furniture polishing rag) dampened with plain water. Water should be applied
directly to the cloth and not the chassis. A very mild plastic or glass cleaner that
does not contain ammonia may also be used. If a mark has been left on the
chassis,
do not use any type of abrasive or chemical cleaner to remove the mark.
Maintenance & cleaning
OWNER’S MANUAL MODEL 312 STEREO AMPLIFIER