The
Grado RA1 is a battery powered headphone amp. If
you want your headphones to sound as good as they can, the
Grado RA-1 headphone amp is a logical step. This Grado
audiophile quality amp is housed entirely in mahogany case
and is powered by two 9 volt batteries. The DC power
supplied by the betteries eliminates the background noise
that is inherent in AC-powered units. The batteries
typically last about 40 to 50 hours. Listen to your highest
quality CDs by going from the line out of your CD player
into this headphone amp, connect your headphones, and
enjoy. More information is available at Grado’s web site:
www.gradolabs.com. Willie
Gluckstern reviewed the RA-1 in Audio Magazine and had the
following quote.
"With the Grado
Reference RA1 handling the amplification, music was rendered
truer, clearer, and more life-like than I had ever imagined
was possible." - Willie Gluckstern, Audio Magazine
Grado's Info:
Housed in a solid mahogany cabinet.
Easily drives two Grado headphones
measures 5(w) x 5½(d) x 1½(h)
weight 12 oz.
single line in (left and right RCA jacks)
single headphone output (drives two headphones with Y
adaptor, not supplied)
I.C. Daul Op/Amp - high current output, wide bandwidth, low
current drain
power output: 250 mw
sensitivity: 600 mv
signal to noise ratio: 85 dB.
distortion(THD): less than .1%
separation: greater then 50 dB
frequency response: .1db, 20 to 20 khz
power requirement - two 9v batteries
Here are photos of the unit.



Price: $ 225 plus $8.95 for Priority
Mail, insured and delivery confirmation. The is for
delivery in continental U.S.A.