Graham Slee " Special Edition" Gram Amp 2 Phono Preamplifer SN # 60 Includes power supply

Graham Slee " Special Edition" Gram Amp 2 Phono Preamplifer SN # 60
Includes power supply

Graham Slee's concept and proprietary implementation of phase integrity


The nearest you'll ever get to the original sound is by using the same technology
that recorded it. Recording studios and top class performers use pro-audio
equipment. So it makes sense that by using a professional audio designed phono
preamp you will get truthful reproduction of your LP collection.
 
Gram Amp 2 SE

Using his pro experience, Graham Slee set out to develop a high-gain
phono preamp fast enough to keep phase integrity as near to
the original as possible and equally capable of handling transients.
Phase integrity is about preserving the sound of things. The RIAA is
accurate to within 0.5dB. The capacitors in the RIAA network of the 2 SE
are very fast polypropylene types, faster than the precision
polyprops. Several different polypropylene capacitors were auditioned in
its development and the ones selected gave the best results in
terms of timbre - both instrumental and vocal. There is a very slight
trade-off with this approach between precision and speed.
The trumpet you hear may be up to half a decibel louder or softer than
the original. It will however sound like a trumpet, which is better
than having a trombone and trumpet sounding like one another. Moreover,
since 1dB is the measure of the smallest difference we can hear,
half a decibel is not really an audible difference in the real world.

Attention has also been paid to the input and output stages. A "special"
type of capacitor discovery, which neither
falls into the conventionally accepted electrolytic, tantalum, or
film/foil categories, is used. This special capacitor allows much
more musical information to pass through than even Elna audio grades. So
for good measure this type is also used in the 2 SE's output
stage.

The preamp can use moving magnet and high output moving coil cartridges
with 2mV to 10mV output @ 5cm/sec velocity and at 9mV,
still have 14dB of headroom. On recording studio equipment, the peak
level is +8dB, and the other 6dB allows for replay of hot pressings,
which are cut at greater velocity. With no rumble filter, the Gram Amp 2
SE has a frequency response from 10Hz - 150kHz (+/-3dB).

The Gram Amp 2 SE is housed in a new silver case with four highly
polished Teflon insulated gold plated phono sockets of the type usually
only fitted to esoteric high-end gear. A plug-in wall DC power supply
unit, overrated several times over, is used to supply
power. The raw DC that the power supply provides is regulated properly
inside
the phono preamp.